Spectra Alignment procedure

[Mastertech]

Hey guys,

I recently replaced a spectra command board and was not able to get the original softpot values. Can someone help me find the specified aligment points. I have a service monitor, and the rest, however, when I go into the board replacement procedure on RSS I dont know what a number of the alignment points are supposed to be set for. Thanks for any help.

Mark

[Jim202]

Bottom line is you in for doing a complete alignment on the radio.
If you haven't done it before, you in for a real trip. Best warm up
the service monitor. It is rather entailed and you should have
the manual to go by. Some of the steps require that a tone be
injected to modulate the TX for the correct adjustments.

Jim

Hey guys,

I recently replaced a spectra command board and was not able to get the original softpot values. Can someone help me find the specified aligment points. I have a service monitor, and the rest, however, when I go into the board replacement procedure on RSS I dont know what a number of the alignment points are supposed to be set for. Thanks for any help.

Mark

[Mastertech]

Hey guys,

Im still looking for detailed and accurate information on the spectra vhf a9 alignment procedure. Thanks.

Mark

[Will]

Im still looking for detailed and accurate information on the Spectra VHF A9 alignment procedure. Thanks.

Mark

I do not remember seeing such a thing. Very vague section in the small manual, not much help at all. We had to go thru each step and come up with what is needed. So, we wound up learning by a lot of testing, ect;.

But them I have been doing Spectras since day one...

[Mastertech]

still looking for the actual numbers. There have to be pre determined values out there that I can measure and verify in order to do this command board alignment, what I cant believe is that no one seems to have them, please help

[jmr061]

Maybe I dont understand something here but if the values were predetermined why on earth would we ever have to tune a radio. Each radio is a little different. Thats how electronics work.

You have to tune it, get a service manual that contains the tuning procedure.

Jason

[kc7gr]

still looking for the actual numbers. There have to be pre determined values out there that I can measure and verify in order to do this command board alignment, what I cant believe is that no one seems to have them, please help

Ahhh... no, that's not really accurate. There is no "pre-determined" value per se for any of the Spectra's alignment figures.

If you look at the service screens in the RSS, you will find references to specific alignment procedures depending on what part of the radio has been serviced or replaced. You need to execute the appropriate procedure, following the given steps in the sequence presented.

I can tell you this much. If you're trying to do the VCO compensation process, you'll need to:

(1) Set your service monitor to the appropriate test frequency the radio will use to transmit (can be determined by keying the transmitter for a moment with F4 or F6 from the menu -- press it again to de-key).

(2) Use the function key for the '11Hz' modulation test. Note the level of modulation, and de-key.

(3) Use the function key for the '67Hz' modulation test. Use the up-arrow or down-arrow keys, as required, to adjust the displayed modulation value to be within a hundred Hertz of what the 11Hz value was. De-key.

(4) Press F8 to program the value, and move on to the next step.

You would do well to get hold of the non-detailed service manual for the particular Spectra family radio you're working with. It will contain the alignment procedure. For reasons best known to Motorola, the detailed service manual has no such info.

Happy tweaking.

[Mastertech]

Ahh, now this is quite helpfull information! I now know where to find the alignment procedure. As far as looking for specific values.... I mean that, just like setting the deviation, there have to be specifications which I can measure, the specifications were what I was looking for. Thank you all for the help.