Note: I originally sent this reply to K9YC only, forgetting that's how this
reflector is configured. Following is my reply, in case anyone is playing
along.
73,
Ken, KJ9B
-Original Message-
From: ken.k...@gmail.com
Sent: Tuesday, August 29, 2023 10:55 PM
To: j...@audiosystemsgroup.com
Subject: RE: [Elecraft] Interesting observations after installing antenna
switch
Thanks for the reply, Jim. However, I never said the amp was throwing an
alarm. It hasn't sounded an alarm since I was inadvertently trying to work
10 meters on an OCFD tuned for 40! For the record, I use a SteppIR 3 el.
for 6 through 20 and an 80 meter OCFD through an LDG AT-1000Pro tuner for
everything below 20.
I will read up on the KRC2 some more.
73,
Ken, KJ9B
-Original Message-
From: elecraft-boun...@mailman.qth.net On
Behalf Of Jim Brown
Sent: Tuesday, August 29, 2023 5:49 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Interesting observations after installing antenna
switch
On 8/29/2023 11:58 AM, ken.k...@gmail.com wrote:
> The designer of the switch says that each band data channel only draws
> around 4 mA, with each channel buffered by a transistor switch in an
> attempt to isolate the band data voltage from the radio. In my
> working days in the entertainment industry, I would use a distribution
> amp to give me multiple audio outputs when needed. Is there such a
> "distribution amp" available for the band data signals? Would the
Elecraft KRC2 accomplish this?
There are multiple formats for band data. I suspect that the one used by
your switch is one that is not compatible with Elecraft's. It's been a while
since I worked with the KRC2 that's in W6GJB's contesting trailer, but I
think I remember that it can be set for all of the common band data formats.
I suggest studying the manual for the KRC2 -- most if not all Elecraft
manuals are on their website.
Your KPA500 is probably throwing an alarm because it's not being
band-switched. However -- I've never sent band data to my Elecraft amps or
tuners -- all it takes is a single dit or tap on the mic for them to detect
frequency and switch on their own.
I don't see mention of a tuner, so I suspect all of your antennas are
reasonably matched to coax. If not, remember that any transmission line
transforms any mismatched load to some different complex impedance (that is,
resistance and reactance), depending on its length. So if line lengths
changed as a result of the switch, it could change that impedance, and some
impedances with the same VSWR look different to the transmitter than others.
73, Jim K9YC
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html Message
delivered to ken.k...@gmail.com
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com
