Yep. When you're trying to get 50-60 dB down, EVERYTHING has to be done
very well. Several years ago, I was not achieving the harmonic
suppression I thought I should, so I bought a spool of BuryFlex (RG8
with a robust copper braid shield) and replaced every piece of coax
inside my shack. I did
One time, a few years ago, when I was living near Mobile, AL, I was
testing an MFJ-949E tuner. It was switched to the internal dummy load.
There was an antenna connected to the balanced line binding posts but,
with it switched to the internal dummy load, these were open
internally. I ran a t
All this doesn't speak well for the quality of the dummy load or coax jumpers.
Bob, K4TAX
Sent from my iPhone
> On Jul 9, 2018, at 10:01 PM, Phil Kane wrote:
>
>> On 7/9/2018 7:12 PM, K8TE wrote:
>>
>> BTW, I have made a 75m QSO on a dummy load. I think I was using Radio Shack
>> coax back
On 7/9/2018 7:12 PM, K8TE wrote:
> BTW, I have made a 75m QSO on a dummy load. I think I was using Radio Shack
> coax back then (in the 1970's when I worked for the company).
When I lived about three miles away from Mt. San Bruno south of San
Francisco, I routinely worked all of the VHF and UHF
I'm curious why significant (you pick the level) isolation is necessary. The
unwanted rf level is down so far that I have not noticed it causing any
issues. If there were two radio ports, then I might be concerned for radio
2 if I were transmitting on radio 1. This is a big concern with a 6x2 or
ft-boun...@mailman.qth.net On
Behalf Of ANDY DURBIN
Sent: Saturday, July 07, 2018 3:54 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KAT500 antenna port isolation
"I suppose the only way to get good isolation data will be to do a sweep of
the KPA500 and Alpha Delta switch"
Sor
"I have similar issue and was told in this mailing list that the issue came
from antenna port isolation but it was within specification."
Ok, but where is the specification? I don't see it in the specifications in the
KAT500 Owners Manual (page 2).
If I browse the DX Engineering catalog I do
"I suppose the only way to get good isolation data will be to do a sweep of the
KPA500 and Alpha Delta switch"
Sorry - that should have read "I suppose the only way to get good isolation
data will be to do a sweep of the KAT500 and Alpha Delta switch".
TMGS?
73,
Andy k3wuc
_
I did in fact misunderstand that a 6m antenna was still connected to one
of the other ports ... I read it that they were open. You could get a
rough idea by listening to the local and removing the antenna(s) from
the KAT500 and maybe terminating the unused ports in a PL-259 with a 47
ohm resis
I have similar issue and was told in this mailing list that the issue came from
antenna port isolation but it was within specification.
If you open the KAT500 box, you will find that lines between antenna ports and
switch relay are close enough to cause inter-port cross-talk.
I wanted to switch
" From your explanation, it sounds like you've switched the active KAT500
antenna port to a dummy load on which you're hearing a local 6m station. If
that's correct, I don't believe you're looking at port isolation, you're just
receiving a local guy on your dummy load, which wouldn't be at all
Andy,
From your explanation, it sounds like you've switched the active KAT500
antenna port to a dummy load on which you're hearing a local 6m
station. If that's correct, I don't believe you're looking at port
isolation, you're just receiving a local guy on your dummy load, which
wouldn't be
On 7/7/2018 12:27 PM, hawley, charles j jr wrote:
> If you have ever disassembled an alpha delta, you can see what it
> takes for an attempt at isolation.
Please elaborate. I use a AD Delta-2 here to switch the antenna
between the K2, GND, and the RigExpert antenna analyzer.
73 de K2ASP - Phil
If you have ever disassembled an alpha delta, you can see what it takes for an
attempt at isolation.
Chuck Jack
KE9UW
Sent from my iPhone, cjack
> On Jul 7, 2018, at 2:13 PM, ANDY DURBIN wrote:
>
> I've been using Alpha Delta model Delta-4 switches for manual antenna
> selection. I though
I've been using Alpha Delta model Delta-4 switches for manual antenna
selection. I thought that having the ability to auto select the appropriate
antenna with my KAT500 would be a significant improvement for my station. I
don't have a K3 so I created a band decoder that drives the KAT500 band
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