[Elecraft] K2 for SO2R

[Jim Harris]

Hi,

Can anyone share their experience using a K2 as part of a SO2R station and 
especially for RTTY.  Seems with it's sensitive receiver, at least on receive, 
it would be a good choice.  I realize it is limited to AFSK only.  The RTTY 
filters can be narrowed to 4-500 Hz.  There has been considerable discussion in 
the past about operating high duty modes at power up to 100 watts.  I've never 
understood if that is a real or imagined limitation.

The other radio would be a K3.

Thanks for any useful comments.


Take pride in the USA. 73

Jim, W0EM


  
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Re: [Elecraft]K2 + K3 SO2R?

[David Cutter]

Is this viable?:  Remove the KPA100 from a K2 and put it in its own box (as 
has been done many times by lots of folk) but operate it from the K3.  In 
this way operate SO2R with the remainder of the K2 as the second rx for full 
SO2R and save a little on the cost of the built-in PA for the K3.


David
G3UNA

- Original Message - 
From: wayne burdick [EMAIL PROTECTED]

To: [EMAIL PROTECTED]
Cc: elecraft@mailman.qth.net
Sent: Sunday, April 29, 2007 9:39 AM
Subject: [Elecraft] Re: in-box SO2R?




On Apr 29, 2007, at 1:26 AM, Chris Page wrote:


Re Wayne's comment about SO2R, can you operate true SO2R with the K3,
ie listen on one band at the same time as you tranmit on another
band?


You could certainly listen on one band and transmit on another, but the 
T-R circuitry would have to be activated on both receivers, blanking them 
during keying.


Full duplex might be possible at very low power (I haven't tried it yet), 
but certainly not at full power. In-box SO2R would probably require very 
extensive shielding that would have completely blown our cost, size, and 
weight budgets.


Also, interestingly, we talked to a lot of SO2R ops who said that in-box 
SO2R was not that great an idea. User interface issues get very tricky, 
and there are T-R problems. For example, if you were trying to switch 
between 40 and 20 meters, the low-pass filter relays would have to be 
switched every time you key the rig. While this can be done, I wouldn't 
recommend doing fast QSK this way. The LPF relays are pretty beefy! It's 
even more dicey if you're trying to switch the ATU network between the two 
bands at CW keying speeds.


73,
Wayne


---

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Re: [Elecraft]K2 + K3 SO2R?

[Leigh L Klotz, Jr.]

I operate my K2 with an external amp but use the KAT100.  Will the K3/10 
and KAT3 combination be able to work with an external amp inline or are 
the connections available only internally?


I realize there may be more advantages to the integrated K3/100 than 
with the K2+KPA100 but this mail thread is about sharing an amp between 
the K2 and the K3, and while we now know the KPA100 can't do this, I 
would like to find out if the K3/10+KAT3 can support a two-port box in 
the middle.


73,
Leigh/WA5ZNU
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