[Elecraft] K3 sub-receiver usefulness?

[Iain MacDonnell - N6ML]

Don Wilhelm wrote:
> James,
> 
> You might want to reconsider whether you are listening to the SW 
> broadcast on the main or on the sub. The low pass filter will be on the 
> main antenna band selection, and if the subreceiver is attempting to 
> receive a signal above the main receiver frequency, you will see a 
> message flashed in the VFO B saying USE SUB RX. That is an indication 
> that the main RX LPF is attenuating the sub-rx signal.

Actually the message is "USE AUX", which is the solution too. Connect
a separate receiving antenna to the "AUX RF" input - or perhaps split
your main antenna and send it to both inputs - and set the sub-RX to
to use AUX.


     ~Iain / N6ML



> If the main RX is at a higher frequency than the sub-rx, I do not 
> believe that is any problem, but when the situation is reversed, the LPF 
> will cut the response on the sub-rx.
> 
> 73,
> Don W3FPR
> 
> James Sarte wrote:
>> Hello group,
>>
>> Someone mentioned in one of the reflector emails that the new firmware 
>> under development will allow independent band switching/monitoring 
>> between VFO’s without a sub receiver. Am I correct in my understanding 
>> then that without a sub receiver, this firmware will allow tuning and 
>> monitoring of separate bands? If that is indeed the case, can someone 
>> please clarify for me how that can accomplished with a single receiver?
>>
>> On a separate note, apart from diversity receive, I’m curious to know 
>> how other people are utilizing their sub receiver? The reason I ask is 
>> I’m finalizing my purchase of a K3, and am trying to determine whether 
>> it’s necessary to fully load up both receivers now. At this point, I’m 
>> ready to purchase 2 general coverage modules plus 2 each of the 
>> following filters: 250KHz, 400KHz, 2.8Khz, 6KHz, 13KHz. I’d like to 
>> have the ability to monitor PSK31, FM or SW broadcast on the sub, 
>> while monitoring phone or engaging in a phone QSO on the main; both 
>> receivers being on separate bands. That’s just one example. Another 
>> could be to monitor SW broadcast on the main while listening to 10m FM 
>> on the sub. Do I need to install the AM or FM filters in the sub to 
>> monitor SW or FM or can the sub’s DSP take care of it?
>>
>> 73,
>>
>> James KC2UEE
>>
>>
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