[HomeBrew] crystal mystery

[johnmars@mindspring.com]

Bill,

The first IF in this radio is 3035 kc.  A crystal on either 2580 or 3490 
will convert that to the second IF of 455 kc, so either frequency will 
work.  Here are some reasons I can think of why your HQ-110C might have a 
3490 kc crystal instead of a 2580:

- A previous owner might have replaced a bad 2580 crystal with a 3490 
because it was available.

- The swap might have been made deliberately to avoid the second IF image 
response from 2150 kc (2580 minus 2150 equals 455).

- I'll defer to the Hammarlund experts on this, but maybe it came from the 
factory with a 3490 kc crystal.  My schematic for the HQ-110 (not a -C) 
shows a 3490 crystal.

Hope this helps...
John, KU4AF
Pittsboro, NC

On Saturday, January 26, 2002, at 06:43  PM, N4NVPHamRadio@aol.com wrote:

> ** HOMEBREW REFLECTOR - Please do NOT cross-post messages to multiple 
> mailing lists on the "To:" or "CC:" line of the e-mail message. **the 
> other day i got a hq-110 c
> someone had stuck a 3490. kc crystal in it
> the book calls for a 2580.0 kc crystal  does anyone know of a mod they 
> were
> trying to do
> or have heard of any mod for the hq-110c receiver
> thanks bill
> n4nvp