[Elecraft] Re: K2 + K3 SO2R?

[wayne burdick]

The K3 won't control a KPA100, David. Please see my comments on the 
auxbus in an earlier posting.

73,
Wayne

On Apr 29, 2007, at 9:25 AM, David Cutter wrote:

> 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" <n6kr at elecraft.com>
> To: <g4bue at adur-press.co.uk>
> Cc: <elecraft at 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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>
>

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