[time-nuts] Some Learning about the RFTG units

John Ackermann N8UR jra at febo.com
Mon Jan 29 01:00:21 UTC 2007


Yes, we think so.

The problem is that the microprocessor in the unit sends initialization
data to the GPS assuming a cold-start on every power-up, so you'd have
to do some hacking to get it to send the right commands.

John
----
Brian Kirby said the following on 01/28/2007 07:56 PM:
> John, are the GPS receivers Motorola Oncores ?  You can make a 8 channel 
> unit emulate the 6 channel unit.
> 
> John Ackermann N8UR wrote:
>> I couldn't get my RFTG-m-XO and RFTG-m-RB units to play together; no
>> matter what I did, the RB unit never recognized GPS from the XO unit --
>> the "NO GPS" LED would always stay lit.
>>
>> I took my units to my almost neighbor (20 miles away) Jim Miller, who
>> also has several RFTG units.  We plugged my -RB into his -XO, and
>> everything worked just fine.
>>
>> Jim then realized that his -XO was an "L106A" and mine was an "L106B".
>> My -RB was an "L105A".  Apparently the A and B units won't talk to each
>> other.
>>
>> We further verified that the B model has an 8 channel GPS where the A
>> has a 6 channel, and the GPS messages that it puts on the interface
>> cable are quite a bit different.
>>
>> So, in order to work properly you apparently need to have either a pair
>> of A units, or of B units.  You can't mix and match.
>>
>> John
>>
>>
>>
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> 
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