[Premium-Rx] WJ 8617B-(S1) SSB Bandwidth Defaults

[stephous]

Geoff and Spencer,

Thanks for the explanation. Now the block diagram makes sense. I was
beginning to wonder why the receiver worked so well. I had a chance to play
with a receiver that had the 3.2/6.4 KHz card. It would have been
interesting to compare performance.

When I connect my 8617B-(S1) to the spectrum analyzer I see a pass band of
approximately 3.3 KHz. This confirms what you said.

In a case where the receiver has a single filter card, say 10 KHz,  would
the final pass band be 10 KHz?

Best Regards,
Steve

----- Original Message ----- 
From: "spencer bahner" <spencer12345 at msn.com>
To: <greer86 at attglobal.net>; <stephous at att.net>;
<premium-rx at mailman.qth.net>
Sent: Thursday, May 10, 2007 7:29 PM
Subject: Re: [Premium-Rx] WJ 8617B-(S1) SSB Bandwidth Defaults


> Steve,
>
> The 10 KHz is used as a roofing filter, followed by the 3.2 KHz
upper/lower
> sideband filter. They do this so that either sideband can be selected and
> both sidebands will pass through the roofing filter. Seems like the 6.4
KHz
> IF filter followed by the 3.2 KHz SSB filter would be the 'perfect'
> combination...don't know if you can get an RX equipped with 6.4 KHz to
> default to 6.4 KHz though.
>
> Spencer Bahner
>
>
> >From: "Geoff Greer" <greer86 at attglobal.net>
> >To: "stephous" <stephous at att.net>,"Premium-rx"
<premium-rx at mailman.qth.net>
> >Subject: Re: [Premium-Rx] WJ 8617B-(S1) SSB Bandwidth Defaults
> >Date: Thu, 10 May 2007 22:16:22 -0400
> >
> >That radio has a separate SSB card with additional filters for SSB.  The
IF
> >signal is routed through the 10 kHz filter and then to the SSB board.
> >
> >Regards,
> >Geoff Greer
> >
> >----- Original Message ----- From: "stephous" <stephous at att.net>
> >To: "Premium-rx" <premium-rx at mailman.qth.net>
> >Sent: Thursday, May 10, 2007 5:27 PM
> >Subject: [Premium-Rx] WJ 8617B-(S1) SSB Bandwidth Defaults
> >
> >
> >>WJ 8617B-(S1) experts: What controls the bandwidth defaults in SSB mode?
> >>Firmware?
> >>
> >>If I select USB or LSB the BW default is 10 KHz. My receiver has the 3.2
> >>KHz
> >>filter in position 1, 10 KHz filter in position 2, and a total of 10
> >>filter
> >>positions. You cannot force the receiver to select the 3.2 KHz filter
> >>while
> >>in SSB modes. I tried several IEEE 488 commands. The filter always
> >>defaults
> >>to 10 KHz, by front panel or by remote.
> >>
> >>Any thoughts before I open the receiver?
> >>
> >>Note: When you clear the receiver it defaults to BW position 1 (3.2
KHz),
> >>AM, 20 MHz.
> >>
> >>Best Regards,
> >>Steve Pappin
> >>
> >>PCS Associates
> >>949 Glenneyre Street
> >>Laguna Beach, CA. 92651-2706
> >>Phone: (949) 376-7844
> >>FAX: (949) 376-7866
> >>http://www.pcsassociates.net/
> >>
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> >>
> >>
> >
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>
>