[Boatanchors] 455Khz IF upconver to 21.4Mhz?

[Chuck McGregor]

At 11:40 AM 6/26/2005, you wrote:

>Hello all,
>
>Along with many of my other birdbrained schemes, I now have desire to 
>connect a panadapter (CEI) that has 21.4Mhz IF to my hammarlund SP600 at 
>455Khz.  Does anyone know of an existing module or tried and true circuit 
>that can do this conversion? I know that a mixer with the right glue parts 
>can do this, but I am only good at constructing circuits, NOT designing them!
>
>Any insight is appreciated!
>Thanks
>Eugene
>PS Any one have suggestions as to where the best tube/pin is to get the IF 
>from the SP600? THANKS!

Eugene-
Suggest you download the IP-259 package in the Panoramic directory at 
BAMA.  It includes the schematic for the Panoramic SB-8A which uses a 6BE6 
mixer as the input stage with an external LO to translate arbitrary input 
frequencies to the panadaptor input frequency.

You want to get the signal for the panadaptor just ahead of the IF 
stages.   On a SP-600 that would be the plate of the second mixer.
There is a good section on connecting panadaptors to many common receivers 
in the Panoramic PR-1 manual, also available at BAMA.
Finally, if you want to add a buffer stage between your receiver and the 
panadaptor,  see "Cathode-coupled Ampifier for Panoramic Adaptors" in CQ 
magazine for August 1946.

Contact me offline if you need the CQ article.

73,
Chuck  N7RHU 


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