Topband: My beverage only hears static?

[terry burge]

Hi Lee,


The only thing I've noticed are some pops going on some of the receive antennas that I think may be an electric fence or some power line arcing. They are about 1-2 seconds apart. I see them sometimes and I can see it causing the AGC on fast to cut back the gain on the receiver. But that does not sound like the constant static I hear.


Just bought some new RG-6 coax from Norvac to replace this old stuff and make sure it's not that. Also got some resistors and 'gators' for checking my 4:1 and 9:1 XFMR's like Tree was telling me. Also got some fence post and 1 1/2" PVC to put up a NE beverage that I hope will reach at least 400 feet or better. 


Terry

KI7M

> On January 13, 2018 at 11:50 AM Lee STRAHAN wrote:
> 
> 
>     Hello All,
>     I may not have seen all of the posts on this topic but will comment anyway.
>     Two things come to mind about this noise. Number one is you do not want to connect the shield of the coax going to the receiver to the ground stake for the antenna. It's important that the transformer you use has an isolated winding for the output to the cable leading to the shack. The other comment is you may have some local arcing or digital noise that the Tx antenna does not hear. The best clue to checking for this is to use the AM mode on your receiver and listen for the characteristic hum from a power line or switching supply.
>     Good Luck
>     Lee K7TJR OR
> 
>     -----Original Message-----
>     From: Topband [mailto:topband-bounces at contesting.com mailto:topband-bounces at contesting.com ] On Behalf Of terry burge
>     Sent: Saturday, January 13, 2018 11:09 AM
>     To: David Olean ; topband at contesting.com mailto:topband at contesting.com
>     Subject: Re: Topband: Topband Digest, Vol 181, Issue 16
> 
>     Hello Dave and Group,
> 
> 
>     I had responded directly to Martin and will include my comments to him. Right now I hesitate to pull the tape off the coax at the XFRM but will do that ASAP to check it out. When I took it off the old spool it had not been used but it is donated to me from a junk yard lot. I also got a 4 foot spool nearly full of 1/2" hardline I'm planning on replacing my ground run of LMR-400 with. 75 ohm but it should work if I can build the connections to the LMR-400 PL-259's, etc.
> 
> 
>     Disconnecting the ground as well as the BOG (in this case) from the XFRM causes the noise to drop down to about S-1 to S-2.
> 
>     With ground connected to the XFRM I get about S-5 noise level without any antenna.
> 
>     Per my note to Martin you can read my other test. Right now with the 550-600 ft. beverage hooked up along with ground of course, I get S-5 noise level and can't hear an S-9+10 over signal on 7.235 Mhz.
> 
> 
>     Terry
> 
>     KI7M
> 
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