Re: Topband: fixing beverage

It would be a simple matter to use my old Tektronix 465B scope as a TDR. But I'd love to have a good dual-port VNA. :-) 73, Mike www.w0btu.com On Tue, Nov 24, 2015 at 3:18 PM, Jim Brown wrote: > There are multiple ways to do TDR. I like the way that this unit does

Re: Topband: fixing beverage

On Tue,11/24/2015 1:30 PM, Mike Waters wrote: But I'd love to have a good dual-port VNA.:-) See the price - about $700 with cal kit and shipping. 73, Jim K9YC _ Topband Reflector Archives - http://www.contesting.com/_topband

Re: Topband: fixing beverage

On Mon,11/23/2015 2:06 PM, Mike Waters wrote: Maybe things have improved lately, but AIM would not be my first choice. There are multiple ways to do TDR. I like the way that this unit does it -- an inverse FFT of a frequency sweep. http://sdr-kits.net/VNWA3_Description.html To expose small

Re: Topband: fixing beverage

I've been doing FFT-based measurements since 1982. I suggest that you try a technique before you criticize it. Your analysis is badly mistaken. Jim, Factually, the little bumps or even big bumps on VHF are meaningless for active problems on lower frequencies. They might predict a future

Re: Topband: fixing beverage

On Tue,11/24/2015 3:02 PM, Tom W8JI wrote: Actually, to see the more gross defects, we would look at a lower frequency. I don't want to imagine what my 160 stuff would look like at VHF. Tom, I've been doing FFT-based measurements since 1982. I suggest that you try a technique before you

Re: Topband: fixing beverage

On Tue,11/24/2015 5:56 PM, Tom W8JI wrote: Factually, the little bumps or even big bumps on VHF are meaningless for active problems on lower frequencies. They might predict a future issue, but on 160 meters even crushing a cable flat for five feet would be meaningless for receive loss unless

Topband: CE3CT on 160 this weekend

Hello, Wanted to pass along a brief piece of info… I will be active from CE3CT as SOAB during CQWW. Will be active on 80/160 for those needing CE on those bands (especially 160m). There is currently very little interest in serious low-band DX’ing from CE, so I don’t think it is terribly

Re: Topband: fixing beverage

There are multiple ways to do TDR. I like the way that this unit does it -- an inverse FFT of a frequency sweep. http://sdr-kits.net/VNWA3_Description.html To expose small perturbations in the feedline or system, make the sweep at VHF/UHF. To see only the more gross defects, sweep from about

Re: Topband: fixing beverage

Thanks all for the help, will upgrade software and try to use it as TDR 73, Jorge Enviado desde mi iPhone > El 23 nov. 2015, a las 23:00, Bill Hider escribió: > > Jorge, > > I have used my AIM4170 many times as a TDR. Your 3 year old AIM_853.exe > should work, but it is

Re: Topband: fixing beverage

I agree with Mike, check the ground connection at the Beverage feed point. 73 Tom W1TO On 11/23/2015 10:26 AM, Mike Waters wrote: Not necessarily. I've seen a poor ground cause low signal levels. 73, Mike www.w0btu.com On Mon, Nov 23, 2015 at 8:21 AM, Jorge Diez - CX6VM

Topband: Fwd: fixing beverage

We have had a lot of recent posting about animal damage lately. Always a possibility.    Your TDR should help provide resolution to the problem where ever, what ever it is. Was a good suggestion from W3LPL   73 Bruce-k1fz www.qsl.net/k1fz/bogantennanotes.html     On Tue, 24 Nov 2015 06:32:47

Topband: A QRP "test" this evening

>From 0200Z to 0330Z tomorrow, this evening here in the U.S., some of us >participants in a weekly QRP Fox hunt will be experimenting in a Top Band >version centered around 1.810. Keeping it brief, our Fox "hunts" consist of two or more Fox stations operating somewhere within a 20 kHz spread