Does this AL-AK have a real GPS receiver in it? Does the unit have a
board with a crystal of 16.368MHz. that is multiplied by 96 up to 1571.328,
the mixing frequency to get to the GPS freq of 1575.42?
Since the down convert-up convert is offered as an option perhaps
TrueTime used an actual GPS receiver in all their units. It stands to reason
(at least to me) using a stock off-the-shelf GPS receiver in all their boxes
would be simpler than having to do a custom kluge to work at 4 mhz.
If this user can find out if his box has an actual GPS receiver then the
converter section could probably be bypassed.
FWIW, the TrueTime XL-AK used an external up converter and down
converter, model 142-6150. Says it's good for up to 1500 feet of RG58. Its
manual is on line. It uses the above mixing scheme.
Al, retired, mostly
AKA k9si
Someone on ebay advised me to contact your website in hopes that someone
in your organization can help me with my TrueTime model AL-AK GPS
Receiver. I need to send it to someone so that they can check it to see if
it works and can track Satellites. This receiver has the onboard up/down
convertor board that changes the receiver input frequency which is set at
4.092 MHz. I don't have the needed down converter at the antenna. I bought
this receiver on ebay from someone who told me that he doesn't have the
down converter as well and can't figure out how to get it to work at
1575.42 MHz. He also didn't know if this receiver can be setup for a
1575.42 MHz by removing the onboard converter and changing some DIP
switches. If one of your members can at least check out the receiver at
4.092 MHz for satellite tracking That would be a big help ...
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