[time-nuts] TrueTime AL-AK GPS receiver help

Bill Hawkins bill at iaxs.net
Thu Apr 30 13:41:00 EDT 2015

Well, the world's favorite search engine has several hits for a TrueTime
XL-AK. There is a manual for the XL-AK 600 receiver. The PDF does not
include the schematic. A down converter is listed as an option, to be
mounted within a foot of the antenna. There is no discussion of the down
converter beyond mounting it close to the antenna.

The manual says the unit was designed in 1994 and is capable of
acquiring six satellites. If the receiver input is 4 MHz, it requires
the down converter at the antenna. This allows use of inexpensive cable
in 1994.

I'd expect this receiver to be as useless as the TrueTime GOES receiver.
Antenna and converter will be hard to find, as they were probably junked
separately. I would not expect the receiver to be set up by changing
some dip switches.

Now, if someone had the RF skills to build a GHz to MHz converter, it
might work.

Bill Hawkins

-----Original Message-----
From: Tom Van Baak
Sent: Thursday, April 30, 2015 11:51 AM

I received this email. Anyone have a good answer?

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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