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-boun...@contesting.com > mailto:topband-boun...@contesting.com ] On Behalf Of terry burge > Sent: Saturday, January 13, 2018 11:09 AM > To: David Olean ; topband@contesting.com mailto:topband@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 > > --------------------------------------------- > > _________________ > Topband Reflector Archives - http://www.contesting.com/_topband > _________________ Topband Reflector Archives - http://www.contesting.com/_topband