[Amps] Automotive Relays

[Jim W7RY]

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 at jeremy.mv.com 
> Sent: Sun, 8 Aug 2010 21:09:42 -0400 
> To: secopsys at aol.com, amps at contesting.com 
> Subject: Re: [Amps] Automotive Relays 
> 
> 
> 
>> In a message dated 8/8/2010 7:13:00 PM Eastern Daylight Time, 
>> w7ry at 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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