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Field Day 4/5/6 BTV Modification
G.M. (WA6CDE)
on
November 19, 2004
View comments about this article!
Here is a little bracket you can make for the field day or emergency use of the 4/5/6 BTV. It allows you to use the PL-259 connector once you get it in place…
I have made several of them over the years, and you can use anything from 0.050-0.063 sheet aluminum or even one was made from a piece of angle extruded aluminum.
I don't understand why Newtronics doesn't have the decoupling built into the bottom of the verticle base but, we have been working on a plate for the bottom mount which also balances the feed line and de-couples it at the same time.
A excellent antenna for limited space, so long as you can put the radials out…
G.M. WA6CDE
This article has expired. No more comments may be added.
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Field Day 4/5/6 BTV Modification
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by KT8K on November 19, 2004
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I am very interested in this, and really want to understand it.
How is the center pin of the SO-239 connected to the base of the antenna? Soldered? Mechanically attached? Or a combination of the two?
I will be very interested in seeing your design including the decoupling feature. I have used a number of these antennas over the years, both in permanent and temporary installations, and they work great with sufficient radials.
Thanks for sharing. 73 de kt8k - Tim
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RE: Field Day 4/5/6 BTV Modification
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by WB2WIK on November 19, 2004
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Good job.
Obviously, a pigtail wire needs to be soldered to the center post of the SO-239 and then bolted to the feedpoint terminal at the base of the BTV insulator (which is a machine screw connection as supplied by Hustler). It's crystal clear to me, but maybe would be clearer if you would have "drawn in" the wire itself.
Since it takes just a few seconds to pigtail-connect coax to the base of a BTV vertical, I never bothered with adding an SO-239 bracket, but this would make it handier for many people.
Now go do the same thing with a Butternut, a GAP, etc....! Those don't have SO-239 connections either.
WB2WIK/6
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Field Day 4/5/6 BTV Modification
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by KK7SS on November 19, 2004
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A Nice idea -- but get real !!
2.1077", 0.2678", 0.7466" ?!?!?!?
What 'average' ham has the equipment to measure and cut to an accuracy of 1/10,000 of an inch!!
How about some "Real World" dimensions ??
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RE: Field Day 4/5/6 BTV Modification
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by W6TH on November 19, 2004
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Congrats om and very easy to understand. Will get to work today and make the mod as never thought about doing such.
You are a friend and scholar, your kindness will always be forgotten.
.: 73 W6TH
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RE: Field Day 4/5/6 BTV Modification
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by KC9GJC on November 19, 2004
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quote:
A Nice idea -- but get real !!
2.1077", 0.2678", 0.7466" ?!?!?!?
What 'average' ham has the equipment to measure and cut to an accuracy of 1/10,000 of an inch!!
How about some "Real World" dimensions ??
/quote
Hmmm, let's see. that would be close to 2 1/8", 9/32", 3/4". And I did that in my head!
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RE: Field Day 4/5/6 BTV Modification
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by WA6CDE on November 19, 2004
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First off.. yes the center of the SO-239 gets connected with a small piece of No.14-16 wire.. its less than 1 inch from the connector to the hustler supplied ring connector which is under the center screw of the antenna. Sorry I didn't draw that in thinking that most would know how to hook up the 239 to the antenna.
Second... again I use a cad-cam program to do all the layout... I reverse engineered the dimensions from the hustler base and then added the bracket drawing to it...
took a piece of .063 6061-t6 alu out placed it on the mill...indexed to 0... and let the NCR end mill make the tracing cuts and holes for the attachments... once done.. all their was left to do ... was take it over to the break and bend it 90 deg..
If you need to have the dimensions in 1/16 of a inch I can convert them over for you... send me a email... as some of you already have... and I will send back the drawing with them on it... instead of the 0.001's which are really quite course for the cad cam program...
One reason we went to the connector instead of the pig tail which DX and other also have... or make yourself.. is due to the excessive hardware cost and losses that incurred with them... here we only have one connector from the feed line... while using the pigtail.. you have 3..( one from the feed line to a dual female then back to the pl-259 and to the antenna...) each time you go through a connector you have a small DB loss not to mention the effects of moisture getting in... so this design only has one connector and direct input to the antenna... which allows it to be set up and taken down in a min of time with the lowest loss through connectors. The second reason for it is the KISS effect... its cheap, easy to make... (one person bent his by hand using a pair of large sheet metal plyers after drilling the holes... another used a piece of alu angle, drill and a lot of fileing to get the same shape... either way it works..)
If your like me... I carry a 50, 100 and 150 ft length of RG-8x with PL-259 connectors on each end... for field day... this then allows one to go from the radio directly to the base of the antenna...with the shortest length required. I also have a second NVIS inverted V antena which goes along also and the same coax can be used on it... etc... For the ground radials... I use either No. 14 stranded electrical house wire... (with insulation stil on... something bright like red, white or purple to alert people that its on the ground... and alu roofing nails to stick in the ends... another ground radial system I have used is the same wire I would use for the inverted V antenna... it is made up of the flex-weave wire. Here we can use the insulated or jacketed stuff... for either the inverted v or for the vertical by simply attaching the ring connectors to either the center strain releaf on the inverted V or to the ground connection on the vertical... that way we don't have to haul a whole footlockers worth of wire along... and it all rolls up neatly into a antenna bag we made which is 5-1/2 ft long like the military has for its AS2295/GR. I took my drawings to a local car apolstery shop and they sewed the thing up for me out of heavy canvis.. has velcro straps to hold things in place even put carrying handles on it too... makes a nice setup.
By the way.. the 4/5/6 btv can be used as the center support for the NVIS inverted V antenna also... due to its height and simply removing the coax feed line from the vertical and attaching it to the center connector.. which has the W2AU balin and placing it up on the top of the 40 m section as a mechanical center post... works great... and again you don't have to take along a seperate pole section...like the 2295 has... when the BTV is strong enough to support the inverted V at the center...
What do we use for the base attachment support... Well we use good old 1.25..(1-1/4) inch cold water pipe... we tried the electrical conduit which was thinner and it works.. but, we pefer the cheap old water pipe... treaded on one end. To get it to go into the ground.. we place a cap over the threaded section.. and pound away.. till its about 4 inches out of the ground... then remove the cap .. save it for later as you can place a chain around the pipe with the cap on.. and use the wilderness jack to get the pipe back out again... Then we have the 5BTV antenna base already mounted on another piece of pipe which is also threaded... to which we added a female coupler... so it will thread onto the water pipe that we just pounded into the ground... and once on.. your in business...after assembling the tubes...runing out the radials... cheap, quick, effecent. total time to put it up... less than 15 min... (fastest antenna in the west .. without trees)
How do I break the BTV down for traveling.. is another question... easy... I break mine down into sections... the base, the bottom 72 inch tube, the 10 to 15 meter trap section, the 20M trap section, the spider (which we modified with springs so the radials can be folded back and snap into place when ready) and the top 60 inch section and the RM=-75S. I used a Sharpie to mark off the tubes so assembling you don't even need to measure.. you match A to A, B to B...kinda thing... its right their on the tube section already... I also have made up a small chart from the insturctions... and then taped it to the lower trap section... it goes togeather in min... and is surpising how it duplicates the resonance frequencies dimensions on assembly.
I orginally used one of the 4BTVs on the airstream trailer.. as a foldover..(Yes dear that was me that came up with that idea... and the guy who was next to me.. also a ham... duplicated it.. and published it in QST.. did you see my call sign and name...hams don't steal designs from others now do they...hmmmm..) so we have had lots of experiances working with hustlers 4/5 and 6 BTVs... we find them to work quite well and for a field day or emergency... or just a regular use antenna.. none finer.. or as econimical, easy to set up and take down...with great preformance... so while the others are trying to throw antennas up into trees that don't exist in arizona...(looking for that skyhook) or are huffing an puffing trying to get that 600 lb gorella of an antenna up for field day... I find it amazing that hours later they are just getting on the air... all while you walked out with on bag of tubes... pounded a piece of pipe in the ground... assembled the antenna... layed out the coax and hooked it up... fed out the ground wires.. and staked them with nails... and your were done...and on the air... simple huh... and cheap also...
Just remember each coax connection has a DB loss... as well as the longer cable...
Oh and one more addition I would like to suggest... as recently while taking the antenna down.. and the wind was blowing... I got zapped... from touching the connectors ... is that you place a RF choke from the center screw of the antenna to the conector ground.. that way it can bleed off the static charge which vertical seem to get... also helps when their are electrical storms around... I always wondered if the ground plane system... and the vertical were more prone to be lightning frendly... especally when the coax runs back to where you operate from... could get illuminating... I questioned Hustler about this.. and got no reply... which probably means that they ignore it and don't want to answer that question... anyway.. might save the radio if its addressed...
As to the balun at the bottom... well.. were playing with it now.. and doing some testing... when done.. will let you know how it works out... so far.. looks good... but, you all might have a problem making the new bottom insulator assembly which replaced the one hustler has currently... as again we milled it out of one piece material to incorportate the homemade T-balun assembly also. It to has a SO-239 on it... but, comes out the bottom... We started with the W2AU as our first try.. and it worked pretty darn good for decoupling as well as balancing the line... on the airstream trailer fold over. Now we wanted to compact it down and incorporate it into the base plate assembly...
By the way.. Hustler informed me that they now do not sell replacement parts for the BTVs... if you mess up the base assembly... or crack the bottom plate... becasue you over torque the screws... you have to buy a completer assembly... which consists of a new base mount for 60 bucks... ouch... Can someone say.. after market parts will take the place of the factory ones... I questioned them about it .. and they said ... no parts... (hmmm didn't used to be that way... must be new management)
Be interested in discussing the merrits of adding the balun with other RF engineers... and get their input as to what they think also... I have never found any articles about doing such...
Always looking for better ways to have fun...
... enjoy WA6CDE
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RE: Field Day 4/5/6 BTV Modification
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by WA6CDE on November 19, 2004
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Someone else asked....
Why don't you do an article for QST and publish it with pics... this is great...
Answer:.. Sorry... I'm not a writer, photographer .. and while QST is a good source...of pictures... I am not a member from years back... issues.
Besides you can get it here on eHam... first.. grin... if enough are interested in the complete system... I will see if I can find the drawings and post them for all the parts and accessories I have described in the writing.
My intention was not to supply parts but, rather stimulate the idea and promote thoughts as to how to make up an emergency or portable system. I was recently approached by a younger ham asking what I thought about using a old military (actually it still is currently in use) antenna system that could be bought surplus... for field day or camping… after looking it over.. I thought there is a better way.. and I sat down with him to think about what he has and what he could get. we started looking at the current equipment already designed.. which only needed modifications to be equivalent or better... and not use surplus expensive equipment. A system which he could use for his daily station and not have to duplicate things or go buy something else to use in the field... We looked at the cheapest antenna on the market... a dipole.. but, in the field you need two supports... and if no trees around (he got yelled at by some environmentalist who thought he was damaging his tree in the Forrest when it was used to put up a long wire) which ruled out using trees for supports… he immediately jumped to the inverted V... good choice... single pole.. idea... and from that came the current one... using the 5BTV… which I am sure he will refine it even further to make simpler, lighter and quicker to set up and take down... but, again as I said it was the intention of supplying the idea... not to provide design plans... to make it... rather to stimulate ideas of trial and error to see what will work in almost all situations n the field..
Currently he is working on designing a mount for his dads cars trailer hitch… so the 5BTV can be attached to the car… where the 2x2 hitch goes in… again saving the effort and work of pounding in the ground mount pipe… when he gets done designing it.. we will mill it out and weld it up for him… to go try out…
Hams helping hams… is the idea…and by making things… it stimulates the mind into new areas such as this younger is doing… no only is he making his own.. but, coming up with solutions to the technical problems in the real world… and that is what its all about… so while other kids are playing video games… this one is using his computer to design, test, and build on… geee wonder which one is going to be the future of America… grin…
73 WA6CDE
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RE: Field Day 4/5/6 BTV Modification
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by KP4HE on November 19, 2004
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I showed this to my friend who owns a 5 BTV. He said it was to much work and it's easy just to connect the cables directly to the screws.
I tried!!!
Great CAD drawing.
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RE: Field Day 4/5/6 BTV Modification
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by W6TH on November 19, 2004
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Mine is complete and finished. According to the prints, the connector will be at a side or to the back of the mount. I extended my mounting plate so it will be in the front direction.
All in all, a great improvement and now I can swing my coax to other antennas if needed and no more on off connecting by screwing and unscrewing those nasty bolts.
Forty years I have had this 5 band trap vertical and it is the first and only improvement.
.: W6TH
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RE: Field Day 4/5/6 BTV Modification
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by KD5UJX on November 19, 2004
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I just took a piece of coax, wound the choke and attached it to the bottom of the 5btv, then a Female so 259 on the other. The whole thing is only a little over a foot long. It's quick and easy. No machine work.
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Field Day 4/5/6 BTV Modification
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by KB0USY on November 20, 2004
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I would like a revised copy first of all.Plus why doesn't wa6cde come up on QRZ.This is a great mod for this antenna.Steve
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RE: Field Day 4/5/6 BTV Modification
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by WA6CDE on November 20, 2004
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Yes the pigtail is a good way to go but,.... as I said before you have a loss with all the connectors (measured .3db-1.7db loss (( 3db is half power))even before you get into the coax line feed loss... which will degrade the preformance both recieving and transmitting... IT is also more expensive to buy all the connectors. using the pigtail... getting the screws, nuts and bolts all in and out each time you break it down. Some have put pigtails on them and then leave the coax attached to the antenna... others use the same as what the manufacture says.. and leave it attached too... one problem we have seen is the ends of the coax.. expecally the larger stuff... has a tendency to break the wires off where they are crimped on... and attached to the antenna. One point that someone else made was that if you hard-wire it to the antenna.. you can't change coax lengths without again going through the connectors.
I got a email from one gent who said that to bend the alu bracket... he put it between two pieces of wood.. and then used a rubber hammer... to bend the metal over... one other also said they clamped it between two pieces of metal angle... and hand bent it 90 by pressing it on the table... and finally.. on other said... easy way to make it... go to the hardware store and get a piece of 2x2 alu angle.. cut it off and then using drills and nibblers cut to dimension... so their are lots of ways to hand make one...
I got one back also that said... he used two pieces of metal... one plate came out over the connector area to act like a shield for the weather... and the other made into the 90 bracket... for the connector...
Just some ideas...
I will see if the manager will also post the revised.. in 1/16 inches drawing for you all... as I went through and changed it over to be simpler... and added your suggestions to the drawing... for the wireing of the center pins... thanks.. G.M. WA6CDE
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RE: Field Day 4/5/6 BTV Modification
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by N1VLQ on November 20, 2004
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I would like some clarification on your suggestion about the NVIS antenna attachment. (Sorry to have to ask, because it's probably clear as day to most of you.)
Are you suggesting to attach the inverted V at the top of the 40 meter section, and run the feedline for that inverted V down the 4/5/6BTV, using it's own feedline? That's how I think you meant. Which I think is awesome. It just wasn't clear to me, the way it was described. (I realize I'm probably too dense. But not shy. I will ask, if I don't understand. I would have emailed, but there isn't any email listed in the profile....)
This has been a wonderful article. I have the 5BTV, and would like to have a little better performance for 75 meters, with a small footprint for antenna's. Thanks, a lot.
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RE: Field Day 4/5/6 BTV Modification
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by WA6CDE on November 20, 2004
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Never feel that any question is too lame... after all you would not ask it if you were not interested in a answer... so it is improtant.
As to how its mounted...
roger.. roger... on that... the top of the 40 meter section where the 80/75 m resonator screws on... is just enough to get a piece of cord around... this then makes the top of the inverted v.. feeding the coax which was disconected from the base of the vertical (now being used as a pole only) ... and attached to the balin at the top ...
A word of caution... while the BTV's tubing is quite stout.. the didn't design it for a sideload... so don't bend the BTVs tubing... one can stress it out if one uses too much/heavy a wire for the elements of the V as you have to remember its alu tubing... and as such... doesn't take much of a strain...sideways. We want to keep it in vertical compression only... with the NVIS antenna attached.
Yes the ends of the INVS inverted V are held about 2.5 ft.. (2-1/2 ft) above the ground... we use saning cord which is cheap, comes in yellow and is insulative... (the construction people use it to lay out building lines, brick layers use it to keep the courses level.. etc... ) You can get a whole 500 ft of it for about 10-15 bucks... at a building supply store... can also be used to wrap Christmas packages .. hint.. hint...
Radiation pattern....
Best we can figure out the signal goes 90.. streight up... from the NVIS antenna adaption... we did a test out in the field... one had the NVIS antenna set up.. the other the BTV... talk about dramitics... what could be heard on the NVIS short range... wasn't even their on the BTV... and vise versa for the long range stuff... so both antennas have their merrit...
I have made up a plate for the top too... where you can remove the 80m resonator and screw this on... it is insulated and we use a homemade small T-balin that it mounted on the plate... (good for about 200 watts) it allows two different inverted V dipole elements to be attached.. 90 deg to each other thus taking the bending moment away from the BTV using just a single inverted V dipole.
Where did we get the wire... for the inverted V... from the ground radials natch...(remember the flexweave wire) as they are the same length we need for our INVS antenna... only thing is now you need to use a tuner to match the inverted V also... while if you use the BTV by itself... you don't want to use one... as it has db losses and most won't tune the trapped antenna...
How are they attached... I use homemade ring connectors at the ends... soldered on... these are large enough to go on the bolts which are on the BTVs base frame... as well as the insulated center section for the inverted V... (here again we made our own.. using simple copper tubing flattened out drilled and the wire attached both mechaniclly and electrically by soldering.. you would be surprised at the cost of copper tubing... and commercial ring connectors... about 1 foot of tubing is all that is needed to make a whole group of lugs... that are 1 inch long )
Another question... can both the vertical and inverted V NVIS antenna be worked at the same time...
No.. The coax runing up the side or wrapped around the BTV pole seems to have a effect on the traps and lengths... so you can only use one at a time.. sorry... but, if the band is funny... the INVS usually gives you about 500 miles of good contacts around... if the band is good... go to the vertical and you can make contacts around the world...
Another asks... do I have to remove the spider assembly on the top.. when I use the NVIS inverted V...
No... the pole of the antenna or its elements are not seen by the inverted V... you don't want to ground the BTV once the coax connector is removed it appears open. Keep the coax wrapped around the BTV pole so that its not putting strain on the BTV... bring it all the way down to the bottom mount before heading off to the tent, motorhome, camper.. what ever... that way if someone trips on it in the dark.. they won't tear your BTV down...
Wow talk about questions... my E-mailbox is full.. grin...
Lots of interest in the system... but, guys we only made the modification plate orginally... grin... TNX GL 73 WA6CDE
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RE: Field Day 4/5/6 BTV Modification
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by N3ZKP on November 21, 2004
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<< as I said before you have a loss with all the connectors (measured .3db-1.7db loss>>
At VHF/UHF maybe, but the insertion loss on properly installed coax connectors on HF frequencies is so low as to be insignificant, unless you have a dozen of them on one coax run.
Lon
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RE: Field Day 4/5/6 BTV Modification
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by KK7SS on November 21, 2004
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Quote:
If you need to have the dimensions in 1/16 of a inch I can convert them over for you... send me a email... as some of you already have... and I will send back the drawing with them on it.
quote:
Apart from having a Red Face (with brain not in gear when fingers started !!)- Yes please, I would like a copy of the dwg with fractional dimensions. Couldn't locate your email address on eham.net ot qrz.com.
My email address is my call sign at arrl dot net
Tnx Dave
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RE: Field Day 4/5/6 BTV Modification
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by W4PVI on November 21, 2004
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While reading thru your article on the BTV I was really drawn to your statement as quoted below
"I orginally used one of the 4BTVs on the airstream trailer.. as a foldover..(Yes dear that was me that came up with that idea... and the guy who was next to me.. also a ham... duplicated it.. and published it in QST.. did you see my call sign and name...hams don't steal designs from others now do they...hmmmm..) so we have had lots of experiances working "
It sounds as if your were referring to a photo and the part about 'THE GUY WHO WAS NEXT TO ME'.
I am curious as to who this guy might be. Could he be Chuck Scheckner (probably spelled wrong) W8UCG SK ? I first met Chuck in Feb 1979 at the HAM-A-RALLY (A function of the International RV Service Net sponsored by the ARC of the WBCCI) and there saw his fold-over mast and 4BTV installed on his Airstream and he always spoke as if this was his design.. There were a number of other Airstreamers using this system there as well, which indicated that it had already been around a few years.
When making the installation on my motor home in 1982 (Now on third MH) the Uni-Strut was abandoned for 1" galvanized water pipe which allowed for the mount to swivel as well as fold-over.... This facilitated the installation greatly and allows tuning from the ground as well as ducking tree limbs in wooded campgrounds. Like you, I didn't go to QST and my article was published in the July 1993 issue of 73 Magazine...
I would greatly appreciate hearing your version of the origination of this fold-over mount, especially the dates involved and if that guy is indeed Chuck .
Regards,
Gene Beaver W4PVI
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RE: Field Day 4/5/6 BTV Modification
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by PE1NPG on November 23, 2004
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What 'average' ham has the equipment to measure and cut to an accuracy of 1/10,000 of an inch!!
I Have!!!
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Field Day 4/5/6 BTV Modification
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by M1DDD on November 24, 2004
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Interesting reading - Thanks ! I use a 6BTV with 4 x 1/4 wave buried insulated radials per band (exactly as it says in the book)and the antenna works wonders. 400W all bands and only need to use a tuner on 80m to tweak to which ever part of band I am on. I have worked 150+ DXCC this year on it and it is still like new. Will probably get a 5BTV for up and coming portable to OY-land in May 2005 but will need to cut the 72" section and sleeve it to make it more portable in the plane..Ill keep reading with interest. Cheers Nick M1DDD
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RE: Field Day 4/5/6 BTV Modification
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by WA6CDE on November 26, 2004
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W4PIV...
I originally started with the 5 btv back in '71/72... my original idea came while I was still in the service... and lived in the AS for a couple of years... and invisioned the antenna as if it were on a big mobile.... I used a lenght of mount to make up for the shortage... about 3 feet.. as the airstream trailer was only 31 ft. long... I orginally also used ground radials coming from the rear bumper going out and staked down with lawn/yard staples made from regular No.12 electrical wire... works much better but, some times you can't put the out due to the parking of another right behind you backwards... it really makes for a great quick getting ready to go antenna... and if you have a AS... you might want to put it on the other side where the awning isn't... so it won't interfear with the awning or cut the fabric when in the stored position... also the radials for the top hat... can be brass screws that are 1.00 inch longer... and then put some stainless steel springs to lock in the tubing.... i.e screw through the tubing... then through the mounting plate... then out the bottom... washer, spring, another washer.. and then a nylock nut... that way the spring will allow the tubing to be folded out of the slot it is setting in... back toward the others... and thus making the antenna fold down flat... (only a suggestion)
I saw it duplicated in severial airstreams later on... and while attaching the antenna to the trailer.. could not be really accredited. to me.... the fact that their is a loop in the coax could... as I was fighting the RF little white dots on the fingers ... and figured that something was needed to de-couple the antenna from the coax... we went out and wound the coax about 10 turns around a coffee can... and taped it togeather after removing it... the neighbor next door came out of his trailer and asked what I was doing.. and took pictures as he was extreamly interested in the antenna system... later again we see it in articles... (our orginal antenna was mounted on the right rear of the AS... but, later changed to the left rear... due to the awning being damaged when the trailer was in tow... (they missed that I think till later also)
I used to be a member of the AS wally bombers... and when we went to the rallies they too wanted to copy it.... and it showed up in several other publications... it really wasn't a trade secret as I also sent a copy of it to hustler... and suggested it for a ... see what you can do... but, they were the only ones that I actually send drawings to... so yes it was a suprise to see that ARRL suddenly had it in their rag.... and still do on the web... then again... who is to say... its allwater under the bridge of life.. as I say.. and if anyone wants it.. fine... after all ham radio is helping each other .. isn't it... just like the bracket I just finished providing... enjoy... WA6CDE
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RE: Field Day 4/5/6 BTV Modification
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by WA6CDE on November 26, 2004
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Mail this to a friend!
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Yes I am away right now.. but, will get the new drawing submitted as soon as I can... I did draw in the connector as well as I have a picture of a completed one that we can add... so please be patent I will get it in as soon as I can... thanks...
W4PVI...
Sorry for getting the call wrong before... as I wanted to respond to your questions... I think a whole thread on RV and haming could be done... with a lot of interest... I get asked all the time about mine... and what I have found... but, that is not what we posted here... as the bracket... more than happy to carry on with the topic but, probably on a different thread... if the webmaster would like to open a new area under mobile... RV, stations and antennas... might be good... too...
Oh one other thing we went to instead of the heavy cold water pipe for most of our mobile stuff... is to go to the square steel tubing... being flat has it advantages especally with folding over.. and they make it in sizes which can go into each other... nice... So I might suggest that you dump the unistrut and go to it for your next project... 73 WA6CDE
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Field Day 4/5/6 BTV Modification
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by N0AH on November 30, 2004
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Mail this to a friend!
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The original design is fine-I have 4 of these things. Why are people always trying to make things so difficult?
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RE: Field Day 4/5/6 BTV Modification
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by KB0USY on January 3, 2005
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Did you ever get a email address of wa6cde.QRZ doesn't post him.I don't think he is current or a licensed operator.Would like a drawing in fractional terms.Thanks steve
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