Astro Spectra Command Board

[toolman60]

I am hoping CmdrWill see this or someone else who has been on the inside of the AS on regular basis.

I am wanting to to this to my AS but can not find any detailed information on what is needed or part numbers.I am trying to locate a manual that has all the board schematics as the manual I have does not have schematics.

cmdrwill hoping you will look at one next time you have one on your bench.

Encryption Voltages
The command board produces two voltages that are used by the encryption module: 10-V (9-V on G
and earlier boards) constant and 5-V key storage. The constant 10 V is generated using components
U604, R608, R609, and C605 (R420, VR403, C457, and Q508 on G and earlier boards) and is fed to
pin 38 of P501. On the VOCON board, the 10 V provides continuous unswitched voltage when the
vehicular battery is connected to the radio and is also switched via VOCON transistors Q206 and
Q207 to provide SWB+ to the encryption module. A 5-V storage circuit comprised of components
R532, R533, and C571 (0.47 farad capacitor) provides +5 Vdc to the encryption module via P501 pin
36 to hold encryption keys for a period of three days with no A+ voltage present. Provision is made
for a battery holder to replace capacitor C571. The addition of the battery will increase encryption
key hold time to approximately one year.

Thanks
Tim

 

[cmdrwill]

PM sent. As the wording is kinda cryptic....

 

[toolman60]

Sorry about that. I just now seen it my last part did not post.

I want to add the optional battery on the command board.

 

[toolman60]

cmdrwill,

This is as far as I can get on any research for the battery for key retention. Hopefully when you inside 1 again you can check this out for me.

 

[cmdrwill]

That is about all I came up with. Of all the Astro Spectras, none had a battery, just the 4.7 f capacitor. Can not even find part number for BT001, but suspect just a 3.6 volt lithium primary 'coin' cell.

All Astro Spectras that have encryption modules all have the capacitor which stays charged from the 'big red lead' which is always connected to the vehicle battery.

Some of the Spectra encryption modules have the battery on the board.

 

[toolman60]

cmdrwill,

Thanks for looking. Yes I think the cap is good for like 3-4 days with out power. They only showed it as option but with no follow up part numbers that I could find. Thats why I reached out to you as you been in several and I am sure their is other folks been in several just thought I check to see if anyone could find more info for me.

Thanks
Tim