xmit and receive frequencies different

[Merlarts]

Hi gang,
 
My K2 (2631) with KSB2 doesn't transmit and receive on the same  frequency.  
There's about a 70Hz difference on lower sideband and 50Hz on  upper.  The
transmit frequency is always lower than the receive  frequency.  
 
Carrier supression is great, transmit audio sounds good, and I'm within no  
more than 100Hz away from the suggested frequencies.  The package came with  
3.6Khz markings.  
 
I've run Cal PLL a number of times.  The VFO is accurate and  linear.  It
just won't transmit and receive on the same frequency.  
 
Any thoughts?
 
Merlin, W3ICT
 
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[Gregg R. Lengling]

You really need to use spectrograph to align your filters...your transmitter
is probably on frequency it's just your filters aren't properly centered so
your receive is off.

Gregg R. Lengling, W9DHI, Un-Retired
K2/100 SN 3075
http://www.milwaukeehdtv.org

----- Original Message -----
From: <[hidden email]>
To: <[hidden email]>
Sent: Monday, August 22, 2005 12:35 PM
Subject: [Elecraft] xmit and receive frequencies different

> Hi gang,
>
> My K2 (2631) with KSB2 doesn't transmit and receive on the same
> frequency.
> There's about a 70Hz difference on lower sideband and 50Hz on  upper.  The
> transmit frequency is always lower than the receive  frequency.
>
> Carrier supression is great, transmit audio sounds good, and I'm within no
> more than 100Hz away from the suggested frequencies.  The package came
> with
> 3.6Khz markings.
>
> I've run Cal PLL a number of times.  The VFO is accurate and  linear.  It
> just won't transmit and receive on the same frequency.
>
> Any thoughts?
>
> Merlin, W3ICT
>
> [hidden email]
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft
>
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com 

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[Don Wilhelm-3]

Merlin,

I believe a thorough filter alignment using Spectrogram to see the
de-modulated audio spectrum will straighten things around for you.  It is
CAL FIL that you need to run, not CAL PLL,

If you are not familiar with using Spectrogram for the K2 filter alignment,
take a look at my webpage http://w3fpr.qrpradio.com ot the mirror at
http://home.earthlink.net/~w3fpr - look on the left sidebar for the K2 Dila
Calibration article - it gives information about accurately setting the K2
reference oscillator and Step 3 provides details on how to use Spectrogram
for aligning the filters.

73,
Don W3FPR

> -----Original Message-----
>
> My K2 (2631) with KSB2 doesn't transmit and receive on the same
> frequency.
> There's about a 70Hz difference on lower sideband and 50Hz on
> upper.  The
> transmit frequency is always lower than the receive  frequency.
>
> Carrier supression is great, transmit audio sounds good, and I'm
> within no
> more than 100Hz away from the suggested frequencies.  The package
> came with
> 3.6Khz markings.
>
> I've run Cal PLL a number of times.  The VFO is accurate and  linear.  It
> just won't transmit and receive on the same frequency.
>
>

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[Ron D'Eau Claire-2]

Hi, Melin:

Make sure you do NOT have either RIT or XIT enabled!  That will cause
exactly the symptom you are experiencing .

Since the same BFO and Local Oscillator is used for both transmit and
receive, those frequencies will be identical. The only thing that a
misalignment in CAL FIL should cause is a shift in the apparent bandpass,
not a shift in frequency.

Since FL1 is *always* used for transmit, if you select FL1 for receive too
nothing at all should change between transmit and receive - not even a shift
in bandpass.  

Ron AC7AC

>
> My K2 (2631) with KSB2 doesn't transmit and receive on the same
> frequency. There's about a 70Hz difference on lower sideband and 50Hz
> on upper.  The
> transmit frequency is always lower than the receive  frequency.
>
> Carrier supression is great, transmit audio sounds good, and I'm
> within no more than 100Hz away from the suggested frequencies.  The
> package came with
> 3.6Khz markings.
>
> I've run Cal PLL a number of times.  The VFO is accurate and  linear.  
> It just won't transmit and receive on the same frequency.
>
>

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