I use a Dow Key 412-2301 Transfer Relay to select my 6m kilowatt amp
or bypass it to the antenna. It is powered with 26vdc and has
N-connectors. Don't recall isolation figures but think they were in
60-dB range. One could use this relay for TR with a kW amp, or to
connect to two radios to
This sounds the same, and I made it to protect the front end of each
radio by switching the radio not being tested to my dummy load in case
one of the radios should transmit. I intended my switch for receive
comparisons. I am surprised the commercial switches can handle a
kilowatt and provide
Years ago, I built such a switch to prevent accidents should one radio
transmit when comparing two radios. It is basically an a/b switch such
that a radio became the active radio by switching the antenna to it, and
simultaneously switching the dummy load to the inactive radio. Neither
radio is
: stan levandowski <sjl...@optonline.net>
To: elecraft@mailman.qth.net
Sent: Sunday, January 1, 2017 6:01 PM
Subject: Re: [Elecraft] {OT} - Variation on use of a coaxial switch (stan
levandowski)
Gosh, everybody, I didn't mean to create any controversy. FYI, I
already have a high q
o: j...@audiosystemsgroup.com; elecraft@mailman.qth.net
> Subject: Re: [Elecraft] {OT} - Variation on use of a coaxial switch
> (stan
> levandowski)
>
> Jim,
>
> Indeed, and an observation I too had made (you'll note I didn't say
> it's 'in
> service', merely 'given to me'
Of John
Sent: Sunday, January 1, 2017 1:41 PM
To: j...@audiosystemsgroup.com; elecraft@mailman.qth.net
Subject: Re: [Elecraft] {OT} - Variation on use of a coaxial switch (stan
levandowski)
Jim,
Indeed, and an observation I too had made (you'll note I didn't say it's 'in
service', merely 'given to me
] On Behalf Of Jim
Brown
Sent: 01 January 2017 19:32
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] {OT} - Variation on use of a coaxial switch (stan
levandowski)
The isolation provided by this switch will be really poor. In addition to
the capacitive coupling of the switch itself, note that only
Subject: Re: [Elecraft] {OT} - Variation on use of a coaxial switch (stan
levandowski)
Stan,
I haven't taken the time to read all the other responses, but have you
considered building your own coax switch.
Parts: 1 aluminum box, 4 SO-239's, 1 two-pole, multi-position rotary switch
(you only need 2
)
-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Dale
Martin
Sent: 01 January 2017 17:31
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] {OT} - Variation on use of a coaxial switch (stan
levandowski)
Stan,
I haven't taken the time to read all the other
Stan,
I haven't taken the time to read all the other responses, but have you
considered building your own coax switch.
Parts: 1 aluminum box, 4 SO-239's, 1 two-pole, multi-position rotary switch
(you only need 2 positions, but more is okay), 100w dummy load
Mount the SO-239's (J1-J4) and
>, Elecraft@mailman.qth.net
Subject: Re: [Elecraft] {OT} - Variation on use of a coaxial switch
Message-ID: <805217a9-a8a2-7b82-ff34-db2765bea...@embarqmail.com>
Content-Type: text/plain; charset=utf-8; format=flowed
Stan,
If your maximum power is 100 watts and the isolation of the swi
That may be one difference. But having been a pro who got paid for
giving advice about things that matter to a client, what being a pro has
always meant to was to make sure that I was
1) Never giving advice you were not certain of; and
2) Always ready to say "I don't know, but I'll find out;"
Note that many antenna switches short the in-used antenna to ground so you
would be shorting the output of the in-selected radio to ground. NOT a good
idea.
MFJ makes a switch that connects 2 radios to 3 antennas. Flip the switch and
the antennas are switched to the other radio. Put a dummy
T-shirt the other day:
MECHANIC
Curious enough to take it apart
Professional enough to put it back together
Smart enough to hide the extra parts
73,
Fred K6DGW
Sparks NV USA
Washoe County DM09dn
On 12/30/2016 4:59 PM, Don Wilhelm wrote:
Ron and all,
I would differ from that a little bit.
Thank you, Don. An Alpha Delta has that isolation. I thought it would be
OK but as a hobbyist and not a pro, I don't know what I don't know.
Happy New Year.
Stan WB2LQF
On Fri, Dec 30, 2016 at 06:44 PM, Don Wilhelm wrote:
Stan,
If your maximum power is 100 watts and the isolation of the
As long as there is sufficient isolation in the switch there should be
no problem. I have done exactly as you describe with my KX2 and IC-7100
using a MFJ-1702C switch, which is rated for better than 60 dB of
isolation to 300 MHz.
Bob, N7XY
On 12/30/16 2:49 PM, stan levandowski wrote:
I
Stan,
If your maximum power is 100 watts and the isolation of the switch is
40dB or more then I don't think you have any problem.
73,
Don W3FPR
On 12/30/2016 5:49 PM, stan levandowski wrote:
I would like to use a coaxial switch for an unintended use and I'm not
sure if it's a good idea in
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