[Elecraft] 2nd RX and roofing filters (sought of)

[Toby Deinhardt]

Hi Greg & Lyle,

Does this mean that one can not reconfigure the radio so that either 
RX is considered to be the main RX? In other words, one can not 
directly tune the KRX3 using the large knob?

It would be nice if one choose (independent of the logical VFOs A & B) 
which RX is tuned by which knob. Obvisiously, if the KRX3 is being 
used as the "main" RX, then the VFO of the standard RX/TX would have 
switch frequencies between RX and TX very quickly, assuming that it is 
tuned to a different RX frequency.

Possible? Not possible?

vy 73 de toby
-- 
DD5FZ, 4N6FZ (ex dj7mgq, dg5mgq, dd5fz)
K2 #885, K2/100 #3248
K3/100 #??? (< #200)
DOK C12, BCC, DL-QRP-AG


----- Original Message ----- 
From: "Greg" <ab7r at cablespeed.com>
To: "Toby Deinhardt" <dj7mgq at muenchen-mail.de>; 
<elecraft at mailman.qth.net>
Cc: "Lyle Johnson" <kk7p at wavecable.com>
Sent: Tuesday, May 08, 2007 6:11 AM
Subject: RE: [Elecraft] 2nd RX and roofing filters (sought of)


> Toby,
>
> Transmit filtering is accomplished in DSP and with the crystal IF 
> roofing
> filters ON THE MAIN RX board.
>
> If you have the subreceiver option installed, all you have to do is 
> select
> VFO B to use it.  The RX filters on the sub RX board will then come 
> into
> play, but you must remember that only the filters on the main RX 
> board will
> be used for transmit.  VFO B tuning will be done with the smaller 
> knob.  If
> you want to tune with the large tuning knob, you can use the A<>B 
> button.
> But if you do, the filters on the main RX will be in play.
>
> Hope this helps!
>
> 73
> Greg
> AB7R
>
>
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net
> [mailto:elecraft-bounces at mailman.qth.net]On Behalf Of Toby Deinhardt
> Sent: Monday, May 07, 2007 3:31 PM
> To: elecraft at mailman.qth.net
> Subject: [Elecraft] 2nd RX and roofing filters (sought of)
>
>
> Hi,
>
> I hope I am not over looking anything the FAQ or the stream of mails
> during the last several days. If not, this might be something for 
> the
> FAQ.
>
> If I have understood correctly, the filters which one wants to use 
> for
> TX must be in the standard receiver and not in the KRX3 .
>
> In my case that would mean that the FM bandwidth filter will end up 
> in
> the primary rx. I have also ordered the 6kHz filter, mainly for
> SWLing. As far as other filters are concerned, I have not made any
> final decision yet.
>
> One idea that I have, is to set up one receiver as a general purpose
> RX and trim the other RX for good contest performance.
>
> Assuming, just for the sake of argument (without caring about how
> sense this combination of filters actually makes), that the filters
> are set up like this:
>
>
> standard RX | KRX3
> ------------+----------
> FM          | 2700 Hz
> ----        | 2100 Hz
> 6000 Hz     | 1800 Hz
> 2700 Hz     |  500 Hz
> 500  Hz     |  250 Hz
>
>
> Will it be possible to have the KRX3  act as the primary RX during
> contests while using the standard RX as the secondary, and vice 
> versa
> when not contesting? Among other things, I assume, this would mean 
> the
> tuning for the KRX3 and TX would be on the "big knob" and the tuning
> for the secondary (standard) RX would be on the "small knob".
>
> If so, would this entail any limitations and will this be 
> transparent
> for the OP (important after 30 or more hours of no sleep)?
>
> vy 73 de toby