First, let me clarify what I said about the two LPN modules. They are both 10MHz output, but the one with the Wenzel 5MHz OCXO has an X2 MiniCircuits frequency multiplier. So both are 10MHz output.
@gpsdo_nut - To answer your questions:
1) Both GPS-XL modules have the VCTCXO but appear not to use it. In both chassis, neither GPS-XL init the big clock if only the GPS-XL module is plugged in (and OCXO unplugged).
2) The behavior is slightly different between the OCXO unit with it's Wenzel LPN module, and the non-OCXO unit with its Oscilloquartz LPN module.
- Both GPS-XL modules work in either chassis
- In the OCXO chassis, neither GPS-XL modules init the big clock with the OCXO unplugged from the backplane
- In both chassis, both GPS-XL init the big clock if the Oscilloquartz LPN module is plugged in
- In both chassis, neither GPS-XL init the big clock if the Wenzel LPN is plugged in
I also have a LPN status in F72 - I never spent much time in the fault screens since everything works
As for EPROM burner/reader I have found the TL-866 to be a good value (OEM page:
http://www.autoelectric.cn/en/TL866_main.html - Amazon,eBay, etc.) and has worked for everything so far. You might need to get more adapters, but they aren't that expensive.
@Colin1256: By 'auxiliary oscillator' I mean there is an oscillator not on the main cpu board. For example, the TCXO units apparently only have a VCTCXO can on the CPU board. No other oscillator. All of my units have an additional oscillator - an OCXO (mounted behind the big clock display), a LPN module, or a Rubidium.
@pacAir: That's all good info to collect. I don't know how but maybe someone could create a shared spreadsheet or something where we can compile that information. Google docs or something? I dunno.
The more I look into these the more it looks like the firmware is customized for each unit built. (Could be wrong of course.) One of the reasons I say this is because my units won't operate alone with their own VCTCXO. You'd think they would at least do that. Also, the CPU from the Rb units will not recognize the LPN modules. I am guessing that if we start collecting the info from the labels (151-...) and F18 we'll find a lot of variation.