Showing posts with label Antennas. Show all posts
Showing posts with label Antennas. Show all posts

Sunday, November 18, 2018

Back again.

I've been tuning around since Wednesday with the little rig (at 5 watts) and a short wire (poorly matched) at the ass end of the sunspot cycle. Could it get any worse? 🤔

Making a few contacts, added a couple of new ones for the QRP DXCC chase (8P9 and VP2V) bringing me up to 60 worked. But damn, it's hard to make Qs! So much easier with the KPA500...

The KX2 is an amazing radio. I'm making this my main rig until I accomplish two goals: get the Tarheel and ground radials installed, and work QRP DXCC. I don't think I'm going to get 40 new ones by the end of the year, but maybe by February and the Orlando fest. The Tarheel screwdriver, though... that would definitely help with the DXCC goal.

I've been working in WordPress for a couple of clients and loving it, so this blog may be undergoing a major redesign soon.

The Jackonaut has called dibs on my office/shack, so he's the Second Op now, relieving the Tiny Brown Kitten of those duties.


Thursday, March 2, 2017

DXCC #223: VP6EU Pitcairn Island

I've been watching the VP6EU DXpedition since it began operations a couple of weeks ago, but I could barely hear them with the indoor wire so I had pretty much lost hope. Then yesterday happened. I decided to put my ass in gear and at least get the window feedthrough panel in place so I could throw the Ultimax end-fed up as a temporary solution. I took some doing finding someone was a saw to cut the panel to the proper length; I had to put a PL-259 on a short coax run using some angel-hair thin solder; and finally I needed to move my desk (with everything on it) away from the window. All done without too much trouble.

With the 31' Jackite pole I bought last year zip-tied to the front deck, the antenna zip-tied to that, and coax attached, I was in business. I'm still getting a lot more noise than I did at the last QTH, but the signals are noticeably stronger when they don't have to pass through a steel roof. It seems like the K3's ATU is getting a better match, too. Still can't run the amp, so 100 watts is what I have to work with for now.



Right off the bat I easily worked VE3VSM/HR9 Honduras (Roatan Is.) on 20m, PJ7AA  Sint Maarten on 17m, and ON4UN Belgium on 40m. Okay, all working. The hunt for VP6EU was on.

I kept my eye on the cluster until I saw VP6EU spotted on 17m just after local noon. He wasn't terribly strong but above the noise level by an S-unit or so. Dropped my call once and got him. No. 223 in the log!


Among the other current DXpeditions that I've been able to check off the list today is TX5T Austral Island on 15m. I had Austral on all bands 80-10 from the TX6G operation a few years back while I was in TX, but this is another new one for my Cedar Key QTH. Also worked 5K0N on San Andres Island on 17m this morning.


Saturday, February 28, 2015

West Mountain Radio TARGETuner

West Mountain Radio TARGETuner and RigRunner 4004U
Took my first visit to the Orlando HamCation on Saturday 14-Feb and got to check out a few things on my wish list. I also scratched a couple of things off the list: a memory controller for the Tarheel screwdriver, and a PowerPole distribution box for better management of my DC power cabling.

I'd been considering the MFJ controllers ever since I bought the Tarheel. Never pulled the trigger on one, though; my track record with MFJ products has been disappointing and another dice roll wasn't going to happen. The Tarheel's standard rocker switch and the MFJ SWR analyzer (one of their products that actually works well for me) was sufficient despite being a pain to switch from the K3 to the analyzer every time I wanted to QSY to a new band. So I dealt with it for the past six years, but I kept thinking I needed a little more automation in the process of changing bands.

I first heard about the West Mountain Radio TARGETuner a few months ago and it looked like a possibility, so it was one of the first things I sought out at Orlando. After seeing it demonstrated and having my questions asked, I bought one through one of WMR's dealers at the show, Ham World, for $235 -- a fair bit more than a comparable MFJ-1927 controller. The TARGETuner is a two-box deal: a compact controller box and a remote SWR sensor that samples the RF. The two units connect together via Cat 5 ethernet cable. The controller also includes a USB port for connecting to a radio's serial port to read frequency data directly and tune the antenna without transmitting.

Four methods of tuning the antenna are available:
  • Auto SWR Tuning -- Samples transmitted RF and adjusts the antenna for lowest SWR match.
  • Auto Memory -- Samples RF and tunes the antenna to the nearest frequency stored in memory.
  • Manual Memory -- Manually recall and pick a frequency in memory and the antenna is tuned to that frequency.
  • Manual Control -- Up and Down buttons raise or lower the antenna, just like in the old rocker switch days.
Hooking everything up is a fairly simple process. The initial settings require the fully extended and fully collapsed positions to be memorized to establish the range of the antenna. I then used the MFJ-259 SWR analyzer to tune the Tarheel on every band from 12m down to 80m, storing the settings into memories.

Setup complete, I began testing. The initial results were mixed. Returning to a stored memory setting would yield wildly different SWR measurements. It seems as though it loses its count, so I reduced both Auto and User Motor Speed settings to Medium-Slow; Motor Ramping was left on. It seemed to work better for a while but would eventually lose the turn count, requiring me to manually tune the antenna after every QSY.

The tuning weirdness continued for about a week as I recalibrated and tried different settings... and suddenly it just started working with all the motor speed settings to Slowest, and the Motor Ramping turned off; I also have the low and high frequency limits set to just below the 40m band rather and just above 15m. I figured the antenna is pretty much a dummy load on 80m, and when I want to work 12m (or 10m with the amp off and ATU on) I just bring the antenna down to Pos:0101 (as low a turn count as I can get) and get a good SWR match. I suspect the really long coil travel between 12m and 80m might be one of the things messing up the turn count. With the 40m-15m configuration it behaved admirably throughout the ARRL International DX CW contest weekend as I bounced around between bands, and a week later and it's still going strong, it is still accurate when returning to stored memory positions.

I've not tried the serial connection to the K3 yet but it is one of the supported transceivers. The instructions are not clear but it seems that the TARGETuner requires a connection to the serial port,. The shack PC is connected already to the K3's RS-232 port, so this is not an option. A support person I spoke with at WMR didn't think it could read band data from the ACC port. No big deal, selecting a memory manually is easy, and the Auto Memory tuning mode works well enough if I really need hands-off band switching -- just tap the key and wait until the controller signals the all clear. Ideally the controller would be able to connect to a second serial port on the PC and read the frequency from Ham Radio Deluxe, N1MM, or whatever logging program is controlling the rig. Maybe a firmware upgrade will address this. Meanwhile, it's working as advertised and making my life a little bit easier when chasing DX all over creation.

Saturday, January 31, 2015

January 2015

My first full month back on the air since moving to Cedar Key. My goal of working 100 countries before the end of January fell a wee bit short with 98 worked, many of them on 12 and 10 meters (49 and 17 new band slots respectively). LOTW confirmations are rolling in at a steady clip -- a total of 47 new band slots confirmed in January, 18 of them on 12m. I'm starting to dig this band.

Only two all-time new ones this month. Got 1A0C for DXCC #205; now if only they'd update ClubLog, the last QSO uploaded was from July 2012. JY9FC was strong (S7+) on 12m Saturday morning 31-Jan, in the log as DXCC #206. Damn, new countries are get harder and harder to come across after 150...

Great C5X operation by the Brits, got them on 40, 30, 20, 15, 12, and 10 meters. Super-fast daily LOTW and ClubLog uploads. Just a great operation all around.

No contests for me in January. I really wanted to participate in the NAQP CW test but had other commitments. The North American Sprint is coming in a few weeks, that might be the first of the year. I've never worked this contest before. First I need to upgrade to N1MM+.

I've been thinking a little bit about 6m and VHF/UHF lately. But thinking more about 5BDXCC, so I think an 80m dipole will have to come first since that's the only band for which the Tarheel is really deficient.

The Tarheel is now permanently ground-mounted and working well despite a minimal radial setup. Cedar Key is unbelievably quiet and this antenna is really doing well for its small size. I really shouldn't be wasting this opportunity to put up something bigger, though.

This month I returned to a written log/notebook. Still do the computer log, that's integral to my station and will always be the primary log for counting DXCC points and uploading to LOTW and ClubLog, but I really started to miss the hand-written log and all the notes and comments, the kind of personal thing you can look back at in years ahead and reminisce. I just can't do that with a computer log, too antiseptic.  So I started jotting down notes and QSOs in a spiral notebook, keeping track of my YTD DXCC total, noting propagation conditions, band openings, and whatever else crosses my mind while at the key.
                                       
The end of the month tally:

DXCC Totals
1/31/2015
CfdWkdCfdWkdCfdWkd
Mixed17320580m122817m6292
CW15519140m11714215m110145
SSB10513330m619312m2460
Digital608220m13217010m4969

Last 10 New DXCC Worked
206JORDANJY9FC1/31/2015
205SOV. MIL. ORDER OF MALTA1A0C1/5/2015
204WESTERN SAHARAS10WS9/9/2014
203SAINT PIERRE & MIQUELONFP/OH5OHO7/21/2014
202GEORGIA4L8A7/13/2014
201WEST MALAYSIA9M2TO7/9/2014
200THE GAMBIAC5II7/8/2014
199AZERBAIJAN4J0SFR7/6/2014
198SINGAPORE9V1YC6/22/2014
197SAUDI ARABIA7Z1SJ6/22/2014

WPX (Confirmed)
AwardTotalAwardTotalAwardTotal
Mixed58780M2317M68
CW42540M26615M232
Phone20930M6912M26
Digital13520M32110M100




Monday, January 19, 2015

Ground-Mounting the Tarheel Screwdriver



I have finally dispatched the tripod! The Tarheel is now mounted at ground level on a 10 ft. galvanized pipe driven about 8 feet into the ground (thankfully the ground is sand...). So now the radials extend horizontally rather than drooping down 3 or 4 feet like before. My SWR on 80m and 10m is still way out of whack -- the antenna will not tune under 1.5:1 below 5 MHz or above 26 MHz or so -- but 40m up to 12m I can tune it to 1.2:1 or better.

There was some very bad RFI on 17m the other day, getting into the upstairs stereo so loud that I could here it downstairs in the shack. This has been greatly improved, and I'm still operating without any sort of RF ground system and only 8 radials @ 9 ft. each. The next items on my To Do list are to increase the number of radials, hopefully longer than 9 ft., and to install some ground rods at each end of the coax to ground the antenna and all the equipment inside.

Sunday, January 11, 2015

Shakedown

Everything works, for the most part. I've pretty much concluded that the high SWR on 40m and lower is simply an installation anomaly. While it tuned 40m just fine in Texas, it never could tune above 15m. Now 40m is an issue, but I can get it as low as 1.5:1 on 12m, thus allowing me to turn on the heater if needed.

The plan of attack is:

  1. Get the antenna off that stupid tripod! A more permanent ground-mounted installation and more/better/longer radials should help.
  2. Move it away from the vehicles. Currently it is sitting a few feet from the Faraway Inn E150 cargo van, which is a lot of metal. Not helping, I wouldn't think.
  3. Replace the coax -- this run of RG8X is pushing 15 years, and has been outside the whole time.  When I order supplies for the low-band dipole I will add however much more I need for a good run to the Tarheel. Probably going to go with LM400.
  4. Ground the hell out of everything -- radios, antennas, and anything in between. The RFI into the stereos is a problem, I'm sure the neighbors are scratching their heads.

Until I get my SWR issue resolved, I'll be spending a lot more time lurking on 12m and 10m (the latter requiring barefoot power and the K3's ATU), slowly chipping away at whatever I come across. Which is a lot, since damn near everything is needed on those bands; I'm currently sitting at 8 DXCC confirmed on 12m, 42 on 10m, so there's lots of catching up to do.



In other news...

Kitten discovers the one warm spot in the shack -- my PS-430 12v supply.


Monday, November 3, 2014

Greetings From NA-076!

Life doesn't suck.

Almost two months at our new QTH. Time to start thinking about antennas. The Tarheel screwdriver served me well in Texas where trees were few and wire antenna possibilities fewer. But now...


Among these marvelous, 100% organic antenna supports are three somewhat equidistant trees that should be adequate for a 100' inverted-V dipole. I'm leaning towards an Alpha-Delta DX-LB Plus for 160m-10m (less WARC bands).

Yes, a pre-built wire antenna that isn't particularly cheap ($190). Rolling my own is a possibility but I know I'll never get around to doing it, so I'm not coughing up extra money because I'm an appliance-operating novice, but rather because I want to get on the air, like, right friggin' NOW!!!

I had great luck with a DX-CC 80m-10m dipole, it was my main antenna for years in NJ. the DX-LB Plus is just a bit longer with an extra set of coils for 160m. The antenna and 100' of RG213 will cost about $300 -- not cheap but not a huge amount.

The Cushcraft R7000 is in storage; I think that will go up eventually as a second antenna. The Tarheel will be set up as well; it will also be perfect if and when I start operating from some of the islands here; there are 15 different entries shown on the US Islands Award directory for little islands in Levy County (including the one I live on). Have Boat Will Activate!

Sunday, July 6, 2014

Of Triple Play and Antenna Maintenance

About time! I worked 13 Colonies special event station K2C in Rhode Island on phone and their QRZ page promises QSL via LOTW! That will be the last one for the phone portion of Triple Play. Now I just need West Virginia on CW. It kills me, I have QSOs in the log for both RI on phone and WV on CW (even have a card for RI), but the Triple Play award requires LOTW verification. Rules are rules. Unfortunately, West Virginia's second ARRL Centennial operating slot isn't until October 22, so to get this done soon I need to find another CW op in WV that uses LOTW. It could happen, I guess...

And another "about time!" -- almost a year after Tarheel sent me a replacement mounting bracket, I finally got around to swapping it out. The new mount fits perfectly. Now I can send the defective mount back and clear my conscious, as I promised to return it to them 11 months ago.

While I had the antenna broken down I did the recommended maintenance -- removed the plexiglass cover, clean the coil with alcohol and a ScotchBrite pad -- and took to the tripod's mast with some sandpaper to remove the black powder coat that I neglected to fully remove when I first set up the antenna in 2009. Now I know there is a good electrical connection between the mounting bracket and the ground radial plate.

I'm still missing a few radials, lost to the lawnmower no doubt, but I seem to be hearing a little better than I have been of late. Maybe it's just coincidental and the bands have simply improved the day I did antenna maintenance. It could happen, I guess...

Either way, I was able to add a few needed countries to my 17m count -- Romania, Belarus, Samoa, Philippines, Greenland -- as well as a few more of the 13 Colonies stations.

Tuesday, December 31, 2013

December 2013 Wrap-Up

DXCC - Not a lot of time spent at the radio this month, what with the holidays and other family business to take care of, but I still managed to work a few new ones -- Zambia (9J2BO), E. Kiribati (T32RC), Senegal (6V7D), and Greenland (OX3XR). I end the month (and the year) with the following DXCC numbers:
  • Mixed: 133 confirmed (171 worked)
  • CW: 73 (119)
  • Phone: 99 (127)
  • Digital: 57 (82)
My first DXCC award for Mixed Mode was applied for and received this month. I've also reached 100 confirmed for 20m Mixed (85 on LOTW, the other 15 on paper). I have not applied for the award, though, because I've not yet had the cards checked. I plan to do that at the HamCon in Plano next June, if not sooner.

WAS - My pursuit of WAS Triple Play is getting close to the end with 129 out of 150 blocks confirmed on LOTW:
  • Phone: 44 (need AK, DE, IA, MI, RI and VT)
  • CW: 35 (need CO, GA, IA, KY, MI, MN, NE, NM, ND, OH, OK, SD, UT, WV and WY)
  • Digital: 50 (worked them all in 2009/2010)
WAS Mixed and Digital awards were applied for and received this month.

2013 in the Rearview - A fairly good year for me, with sporadic operating after getting the station back on the air in June. Foremost, I upgraded to Extra Class after years of procrastinating. I achieved DXCC and started getting serious about CW as I've been promising to do for decades. Some new equipment found its way into the shack -- the Flex 1500 and KPA500; hopefully the former will start to get some use (maybe go for a second Triple Play running QRP?).

Long time coming...
2014 in the Windshield - My main objective in the coming year is to get an antenna on the roof; if nothing else, just my old R-7000 vertical that has been sitting in the garage since 2008. Ideally, though, it would be a hex beam for 20m-6m in addition to the R-7000. Wouldn't mind getting the FT-7800 in the car, either. I'm going to try to work as many of the major contests as time allows. The only equipment I think I need is a auto-tuner that can handle the KPA500. The obvious choice would be the KAT500 if I can gather the scratch. More DXCC awards and endorsements are on the horizon -- I've already enough confirmations for 20m DXCC (once I get the cards checked), I'm one shy of Phone DXCC, I have 73 confirmed on 15m, 67 on 40m, and 76 on CW. WAS Triple Play is close, too. 

Monday, December 16, 2013

2013 ARRL 10M Contest

My first all-CW effort in a contest that was mixed mode. Also the first test in which I used N1MM Logger to generate the CW. This worked swimmingly. No more pushing buttons on the K3 to send my call and exchange from CW memories!

Bad noise the whole weekend -- not just the usual electrical noise (though that was bad enough) but the neighbor's dog would not shut up. And the train... folks, never buy a house across the street from the railroad tracks. Union Pacific is at the top of my shit list this weekend.

QRV a bit under 12 hours total operating time with lots of short breaks. Since the Tarheel only tunes up to 21 MHz, I had to keep the amp off and use the K3's ATU to match the antenna. Consequently, I could only hear and work the loudest signals on the band.

In the end, 22 states (not incl. KL7 and KH6), 9 CanProvs, and 29 DXCC. No new all-time countries for me, but every one of the 29 is new on 10m, a band for which I have exactly three QSOs in the log in 26+ years. Got 8 of the 24 state I need for the CW portion of Triple Play (five already confirmed on LOTW!).

Tuesday, July 7, 2009

Top Loading

"It is important to recognize that simply adding a top hat to a vertical of a given physical height may reduce ground losses." -- The ARRL Antenna Book, 21st Ed.

Wednesday, June 17, 2009

QRV.

Worked UA3 and LY on 20m late Monday (early Tuesday UTC), my first HF QSOs since moving to Texas. Bands were awful but there seemed to be an opening over the pole to Eastern Europe, as I heard a few other stations in there as well; ER4DX was 20 over but didn't hear me. Later on Tuesday & Wednesday I worked TI, XE, KH6, VE and ES. Only 93 to go for DXCC from W5-land!

The Tarheel has been great so far. It's noisy (as verticals tend to be) but it's hearing stations that I'm not hearing at all with my stealth wire on the RX Ant input. I'm thinking now that I should have added the Ameritron SDC-201 controller to facilitate band switching, but for now I'm using the MFJ analyzer to tune the antenna without keying the K3.

Ham Radio Deluxe has become a true extension of my K3, operating without it is like attending a formal without pants. I finally dug out the old Dell (2.0 GHz P4 with 512MB RAM) and got it running, completely dedicated to amateur radio operations. Linda brought home a newer Dell from work with a 15" LCD monitor; not sure what processor is in this one but it isn't important -- what I'm using now is adequate, it's already set up with Wi-Fi card, HRD, and some other ham software, and I dread the thought of having to reconfigure another PC. (As a Mac guy, doing anything with Windows is torture. I think we should make Gitmo detainees administer a Windows network; they'll be begging for waterboarding before the end of the second day.)

So with the PC up and running, I had to clear off a bunch of stuff from my desk to make room for the monitor. Should have done this long ago as most of the stuff is seldom used (if ever). I removed the second '515 along with all the little dust-gathering peripherals to make room for the LCD and moved the mic boom over. Now I can actually see the K3, the HRD display, the power/SWR meter at the same time while speaking into a mic and typing without moving my head from side to side.

Now I need only figure out what to do with all the shit that is scattered all over the shack...

Getting RF into my audio chain, so I have to turn the Multi-RX off when transmitting and use headphones fed directly from the K3. Some sleuthing is in order; methinks it is a station ground issue because... well, there ain't none.

Sunday, June 14, 2009

Tarheel 200A-HP Antenna: Installation & Initial Tests


Issue One: How do I mount this thing? My first thought was to hammer a 1" galvanized steel pipe into the ground. Then I remembered this heavy duty speaker stand that I scavenged out of the dumpster at the music store a few years ago. It's one of those stands that is designed to elevate a PA monitor; the handle normally used to raise and lower the cabinet to the desired height was broken off but it was otherwise in good shape. I had no idea what I was going to do with it but I figured someday I would adapt it to one of my hobbies -- maybe a telescope mount or a camera tripod. It sat around in my boiler room in NJ for years, then almost got put in the trash when we moved but at the last minute I threw it into the U-Haul. I'm glad I did.

It never occurred to me to use it as an antenna mount until the HamCom show where I saw a similar setup at the Buddipole booth. That rang a bell in my head, so I dug it out of the garage Saturday night. The upper mast is 1", exactly the size needed for the MT-1 mounting bracket and ground radial plate. And though the mast cannot be raised or lowered from it's broken position, it turned out to be the perfect height to mount the MT-1 with the ground plate just a few inches below. This puts the plate about 3.5" above the ground, which means the ten supplied 9' radials droop down before extending outward.

The antenna stands over 15' tall when fully extended for 75/80m. I'm a little concerned about the top-heaviness of the whole thing; wish the mounting bracket U-bolts would fit around the lower section so I could remove the gear assembly and top mast to get the center of gravity closer to the Earth's core. It's not going to tip over all by itself, it's fairly sturdy, but I fear a good blast of Texas-style sever weather might topple it. I'm considering some sandbags on the tripod legs to hold it in place. At least it's portable enough to move indoors or lay down if the wind picks up. While not an ideal permanent mounting solution, it works quite well as a temporary/emergency/portable/field day antenna mounting system. I may eventually move to the pipe-in-ground method; for now, however, this gets me on the air.

While mounting the antenna to the MT-1 bracket I had a bitch of a time fastening the upper half-bracket. Even threading the lock nut on one side just enough to grab the screw, I could not get the screw on the other side through the bracket enough to fasten the other nut. I tried numerous times until the nut got dropped and went bouncing off into the tall grass. I finally just fully tightened the one side and left it for another day -- it's not going to be going down a highway at 80MPH so it's good enough for now. I'd ultimately like to adapt some sort of cam-lever quick release for this upper bracket to facilitate quick break down.

Assembly completed, I did some initial testing with SWR analyzer and found the 200A to tune well on most of the bands I care about -- 1.2:1 or better on 40m through 17m, about 1.25:1 on 15m, and a hair under 2:1 on 75m. With the inductor fully retracted the antenna was resonant on 22.9 MHz, well under 1.2:1; I'm guessing I will need a shorter whip to tune 12m and 10m, which I'll worry about when the sunspot cycle perks up.

Getting the control cable and coax to shack is going to be my next mission. Right now I have it coming in through the window but despite stuffing bubble wrap into the gap I'm still getting bugs working their way into the house. The MFJ feed-through panel is pricey, so I might try to fabricate something similar as soon as I can get to home depot to buy a 2x4 and a circular saw (I left way too many tools in NJ...).

With the 200A hooked to the K3 I'm hearing many more stations that are weak or inaudible with the RX wire antenna; other stations that are strong with the RX antenna are 10dB or more stronger with the 200A. KH6IB was S9+20dB on 20m but I couldn't break through the small pileup he was working through before he started calling for mobile stations only -- even though others who were most definitely not mobile still called him, I followed his instructions and held off. Finally I shut it down since I'm exhausted and need to hit the sack. First QSO will have to wait...

HamCom 2009

Made the trip as planned to Plano this morning to the HamCom show. After doing the math I deduced that this is the first big ham radio show I've been to since Dayton in 1993. Much has changed in 16 years.

First thing upon arrival I sought out Tarheel Antennas, hell bent on getting an antenna before doing anything else. Had a talk with Gaylon WBØW and settled on the Model 200A-HP package with a ground radial kit and an extra 50' length of control cable. This lightened my net worth by some $600. Stuffed the whole lot into the car then went back to see the rest of the show. Grabbed the adapter cable to mate my Heil Classic 5 with the K3, and found the BNC-to-screw terminal adapter that I needed for the KX1. Shopping spree completed, I did my walkabout; The Best Damn Wife Ever™ parked herself in a chair with her Kindle and waited patiently as I ran around like a 5 year old at Chuck E. Cheese's.

I was happy to finally get my paws on some of the newer rigs like the Icom IC7800/7700/7600 and Yaesu FT-9000/2000 and spin the knobs and push some buttons. All of these radios had front panels that remind me of an instrument panel in a 747 -- lotsa' stuff going on. The K3 by comparison is minimalist and elegant, not that I would mind having any of these rigs in the shack. The 7600 was especially nice as it might be something I could afford someday, though I'd be hard pressed to replace the K3 with anything from Japan.

Elecraft had a booth, showing their new W2 wattmeter and K144XV 2m Module for the K3. Eric WA6HHQ was off giving a presentation so I didn't get to grill him about the lack of AM Synchronous Detection in the K3 as promised. Almost bought a K1 kit, but held off because I already spent way more than I should have already on the above mentioned , and also because I know I'll never use it. But I just have itch to melt some solder and wind some toroids.

K144XV installed in K3

Sadly Ten-Tec was absent from the show. Too bad, I really wanted to have a look at the Omni VII and Orion II.

And then there was Flex Radio. Wow. Just... wow.

Flex Radio Systems. Did I mention, Wow?

I can imagine one of these in the shack someday...

Monday, July 30, 2007

Antennas, etc...

I bought one of these antennas on eBay for $20, reasoning that it was cheap enough to take a chance, and if it works it would serve as a travel/portable/emergency HF antenna for my KX1 - and, short-term at least, as the main antenna at the house. The seller, Bell Imel Group LLC, says:
This system requires NO GROUND and NO COUNTERPOISE. It only requires a minimum of one support and it can be configured for vertical polarization, horizontal polarization and NVIS operations. It tunes from 40 meters to 10 meters using an internal tuner on your rig or an external tuner.
Sounds good to me.

It arrived by Priority Mail in about a week. Upon first inspection it looks like a 50 ft. length of zip cord with one of the twin-leads cut at the halfway point. It terminates in a BNC connector.

First test was to hang it from a hook off my deck, running it along the front of the house, around the corner and through the door into the shack. In this configuration the KX1 tunes it up fairly well on 20m (3.1 SWR) but SWR is pretty high (9.9) on 40m (as measured by the KXAT1, which may or may not be calibrated correctly..); I'm hoping both of these figures will improve if I get it up high and in the clear, and away from the side of the house. On receive, the antenna works quite well. And quiet - even with the plasma TV on there was less broadband noise than I typically encounter with a random wire or the Jeep-mounted verticals (Outbacker and mono-band hamsticks). So in all, it's $20 well spent.

The only question is: What exactly is it? A J-Pole ? A Zepp? Damned if I know. I can't find any similar antenna design on the web or in any antenna books in the shack. From what I can tell it doesn't seem to be cut for any particular frequency as it requires a tuner to match it to 50 ohms. But it appears to work.

Some links regarding end-fed wire antennas:
While in antenna mode I took some time to properly attach the TerraFlex mounting brackets on the Jeep, drilling through the transom and bolting them firmly to the body. While doing this I had a close look at the HF connector and found it to be pretty much shot. I originally salvaged this from a 3-magnet mount that was on my old SE-R; I guess I got my money's worth out of it, but it's time for something new - the High Sierra Sidekick is the #1 candidate to replace the Outbacker.

Until then, I bought a new 3/8-in-to-SO239 mounting stud and installed it along with a short grounding wire from the underside of the stud to one of the screws which hold the door latch thingy. Now I can tune the 40m hamstick to under 2:1 - without the ground wire the antenna was a basket case, reaching 50 ohm resistance down around 6.2 MHZ with an SWR dip a bit lower. I adjusted the whip for lowest SWR in the CW portion of the band. So now I have at least one antenna that loads up properly. The JST-245 has no problem matching it even up in the phone segment. Of course it's still about 8 ft. away from the plasma TV, so not much use until the living room is shut down for the night. Been too hot and sticky to do anything with the hamsticks for the other bands, but the Outbacker, once cleaned up, loads up nicely on all bands except for 10m. The JST-245 is getting some use now; might try some RTTY next chance I get.

With the mobile antennas out of the way, I relocated the end-fed wire antenna to the back of the house, running it out the bedroom window and along the side of the house - still not in the clear, but it works well enough for me to SWL and practice my CW at night with the KX1 before I fade. I'm still too chickenshit to actually attempt a QSO, though I'm finding myself on occasion able to copy CW without realizing that I'm copying it, a sure sign that it's starting to stick. I did some tuning during the IOTA contest this past weekend and was able to copy some of the higher-speed QSOs - but contest QSOs are relatively easy because they're predictable.

The KX1 has turned out to be a real pisser of a radio; despite crappy band conditions and RFI I've had lots of fun tuning around and getting to know all the menu-driven features to the point where I can operate the rig without the manual. I'm hearing a lot of stations in the midwest and south during my midnight tuning sessions, plus the occasional European.