Is there anything about the voltage or current on the keying line that would
prohibit putting the K3's key line in parallel with an ICOM's keying line so I
would not have to switch between the two when sharing an amplifier?
In other words, could I just use a "Y" connector to connect the two
tra
You might have a problem when only one rig is powered up, with the unpowered
one pulling down the key/control line. The K3 is OK, as both outputs are open
drain/collector. If that's also the case with the ICOM, the "Y" connector
should work. If the ICOM has a pull-up resistor, or anything ex
> You might have a problem when only one rig is powered up, with the
> unpowered one pulling down the key/control line. The K3 is OK, as both
> outputs are open drain/collector. If that's also the case with the ICOM,
> the "Y" connector should work. If the ICOM has a pull-up resistor, or
>
Fred,
I run a Kenwood TS-590S and the K3 with my Tokyo Hy Power HL-1.2Kfx amp. I
take the keying and ALC lines from both rigs and connect them to an LDG
ALK-2 switch (2 port switch) and then connect a set of "common" keying and
ALC lines from the LDG to the amp. Works just fine.
Harry WE1X
--
I don't think the diode isolation will work in this case.
Scott K9MA
On Feb 16, 2011, at 2:36 PM, Paul Christensen wrote:
>> You might have a problem when only one rig is powered up, with the
>> unpowered one pulling down the key/control line. The K3 is OK, as both
>> outputs are open d
>I don't think the diode isolation will work in this case.
>
> Scott K9MA
If the Icom used an amp key line from an NPN transistor with an open
collector and a high value (e.g., 10K) pull-up resistor to a positive supply
rail, then all one needs is a steering diode added to the Icom key line
c
Sorry, I still don't think it will work reliably with the ICOM unpowered, if it
has a pull-up resistor, etc. However, the ICOM may in fact be open
collector/drain, in which case there's no problem. Might be worth checking.
Scott K9MA
On Feb 16, 2011, at 3:48 PM, Paul Christensen wrote:
Sounds like a wager for some beer money! :-))
Paul, W9AC
- Original Message -
From: "Scott Ellington"
To: "Elecraft Reflector"
Sent: Wednesday, February 16, 2011 5:10 PM
Subject: Re: [Elecraft] K3 keying an amplifier
> Sorry, I still don't think it will
K3 keys Alpha 9500 plug-n-play full break-in sweet!
73
WD1V
Sent from my iPhone
John Seney
603 785-2413
On Feb 16, 2011, at 2:30 PM, Fred Serota wrote:
> Is there anything about the voltage or current on the keying line that would
> prohibit putting the K3's key line in parallel with an IC
The same thing can be accomplished with any 2 x 2 or 2 x 4 audio
switcher - left/right become PTT and ALC. Radio Shack and most
consumer electronics stores have a reasonable selection of A/V
switches generally for less than the cost of a case, switch and
the connectors.
73,
... Joe, W4TV
Message: 9
Date: Wed, 16 Feb 2011 16:52:50 -0500
From: "Joe Subich, W4TV"
Subject: Re: [Elecraft] K3 keying an amplifier
To: elecraft@mailman.qth.net
Message-ID: <4d5c4732.1030...@subich.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
The same thing can be accom
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