You and them must have back luck!
I'm using a BN-86 on the TH7 and run RTTY contesting at 1500 watts. Never had
an issue in the 8 years it's ben up. The aftermarket baluns all seem to cause
the SWR to go up.... At least on the TH7...
When I installed the BN-86, the swr curve was just like the one in the manual.
I can't explain it. Neither can others.
73
Jim W7RY
> -----Original Message-----
> From: km1h@jeremy.mv.com
> Sent: Sun, 8 Aug 2010 21:09:42 -0400
> To: secopsys@aol.com, amps@contesting.com
> Subject: Re: [Amps] Automotive Relays
>
>
>
>> In a message dated 8/8/2010 7:13:00 PM Eastern Daylight Time,
>> w7ry@inbox.com writes:
>>
>> It was most likely a TH-6 or TH-7. Or a 2 element Cushcaft 40 meter beam
>> since they are the only antennas that I have used over the past 18
>> years.
>>
>> 73
>> Jim W7RY
>>
>> If I had to guess my money would be on the Cushcraft 2 ele shorty forty.
>> They used rustable sheet metal screws under the shrink tubing on the
>> loading
>> coils to connect the aluminum element to the loading coil wire. It is
>> obvious where the screw is located by the slight bulge in the shrink
>> tubing. It
>> can be repaired without removing the shrink tubing by cutting a small
>> circle
>> around the bad screw, replacing the sheet metal screw with stainless,
>> then
>> sealing it up.
>>
>> Richard
>
>
> Most CC owners I know used stainless when assembling those antennas and
> the
> factory followed suit decades ago.
>
> Id say Hi-Gain was a prime example of intermittents waiting to happen. In
> the traps, the single point element compression screw or the sheet metal
> screw attaching the Beta Match to the boom. And good luck to anyone using
> the provided BN-86 balun at over about 800-1000W. Id hate to try and
> count
> the number of TH-6's and others Ive helped take down for rebuilding or
> simply selling off. Ive got parts of 3 of them out in the woods, used the
> booms and some element material for HB monobanders.
>
> Carl
> KM1H
>
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