[Elecraft] K3 sub-receiver usefulness?

[Don Wilhelm]

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.

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
>
>