[Drake] NB-7A

[Garey Barrell]

Marty -

The "A" is a direct replacement for the "7".   The only difference is 
that the "A" has a two pole crystal filter at 5.645 MHz added.  I 
believe this was added at the time the R-7 came out, and the "A" is the 
recommended NB for the R-7.  Essentially it just adds two more poles to 
the "roofing" filter in the TR-7/R-7.

73, Garey - K4OAH
Atlanta

Drake C-Line Service Manual
<http://www.k4oah.com>



Allen (Marty) Martin wrote:

>Did I read a post earlier saying the "A" model nb-7 was not a direct
>substitute for the nb-7?
>
>Thanks!
>Marty
>
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