Topband: Topband Digest, Vol 181, Issue 16
ki7m at comcast.net
Sat Jan 13 14:09:27 EST 2018
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.
I will perform some checks and let you know. The beverage is plugged into RX IN jack like it should be. I just removed the Array Solutions Front End Protector and that seemed to make the noise floor lower on AM band. I was able to pick up signal perhaps a little better. Not the best time to be testing right now at 10:30 AM for these bands of course. But in checking on 80 mtrs I found an SSB signal on 3947 KHz and checked that. An S9+10 signal can't be heard when I switch in the RX BOG. I background goes from S-6 up to S-7 when i switch the RX in?
The XFMR is the one with the SO-239 for the coax which of course is the right one. I have tried beverage and ground swapped both ways on the two 'butterfly' connections. I will switch back to the 550-600 north beverage from the BOG and do some more checking later.
> On January 13, 2018 at 10:19 AM David Olean wrote:
> Hello Terry
> I would suspect the coax could be bad. Is it new or has it been laying
> around awhile.? I have had water get into flooded RG-6 coax, and with
> all the metals associated with the shielding, the corrosion has produced
> a battery effect and there is DC voltage there as read on a high
> impedance DVM. Of course the coax produced copious amounts of noise as
> well. Critters had chewed on the new coax to allow water entry. You
> can test the cable with an antenna analyzer or even a DVM. You should
> see no leakage between conductors. If there is any resistance showing,
> you have a problem. If you disconnect the beverage at the far end, the
> noise should drop to zero with just the coax connected. If you hear
> noise, it is coming in on the coax or is being generated within the
> coax. Good luck and I hope you find the problem.
> Dave K1WHS
> On 1/13/2018 5:00 PM, topband-request at contesting.com mailto:topband-request at contesting.com wrote:
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> > 1. Re: My beverage only hears static? (Martin)
> > ---------------------------------------------
> > Message: 1
> > Date: Sat, 13 Jan 2018 16:12:29 +0100
> > From: Martin
> > To: topband at contesting.com mailto:topband at contesting.com
> > Cc: ki7m at comcast.net mailto:ki7m at comcast.net
> > Subject: Re: Topband: My beverage only hears static?
> > Message-ID:
> > Content-Type: text/plain; charset=utf-8; format=flowed
> > No matter where the beverage points to, terminated or not, hearing only
> > s5 static just seems not right to me.
> > Did you connect your antenna to RX IN (not OUT) ? What XFMR do you use?
> > Grounded the coax at the feedpoint by accident? What happens when you
> > leave the frontend protector out of the setup? Will your K3 pick up
> > signals when you connect your TX-antenna to RX IN?
> > 73, Martin
> > Am 13.01.2018 um 15:16 schrieb topband-request at contesting.com mailto:topband-request at contesting.com :
> > > > > Message: 8
> > > Date: Fri, 12 Jan 2018 12:44:25 -0800 (PST)
> > > From: terry burge
> > > To:topband at contesting.com mailto:topband at contesting.com , terry burge
> > > Subject: Topband: My beverage only hears static?
> > > Message-ID:<787619245.139836.1515789865550 at connect.xfinity mailto:787619245.139836.1515789865550 at connect.xfinity .com>
> > > Content-Type: text/plain; charset=UTF-8
> > >
> > > Hi folks,
> > >
> > >
> > > I put up my first beverage recently. It's about 550-600 feet of 17 gauge electric fence wire running to the north about 6-7 feet high. Not terminated right now but using a beverage transformer I purchased on qth.com and have not put on the termination yet. Using a 5' galvanized ground rod at the transformer and 75 ohm RG-6 surplus I got about 35 feet to my K-3 Elecraft thru an Array Solutions frontend protector to the RX antenna connection.
> > >
> > >
> > > All I get is S-5 static on the beverage. Even the strong stations barely make a ripple of noise. Is this right?
> > >
> > >
> > > I added some clamp on ferrites to see if the Common Mode Noise would be cut down but after putting 5 on the RG-6 coax there is no difference. Just that S-5 static level on any band 80/40/20/etc. Right now I'm listening to P49MR on 14.250.0 Mhz and his 57 signal does not even come thru on the beverage when I switch to RX antenna?
> > >
> > >
> > > Terry
> > >
> > > KI7M
> > >
> > > > >
> > > _________________
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