Royce 641 PLL sealed can SCHEMATICS diagram

[Retro CB Guy]

I thought I'd throw this out there, figuring no one has this info but who knows without asking.

I would like to get the schematics diagram/service data for the CB am/ssb base model 641 (PLL module)...

Might someone have that please ?

73's thanks for looking, Retro

 

[tecnicoloco]

http://www.cbtricks.com/radios/royce/1_641/index.htm

My 2 Tacos

 

[Retro CB Guy]

http://www.cbtricks.com/radios/royce/1_641/index.htm

My 2 Tacos

Thanks appriciate it Tecnicoloco, but there is no schematics there of the actual sardene tin can PLL module which is filled with tons of components, that would take a long time to reverse engineer...

SAMS photofact relevant to this radio doesn't have it either nor does the users manual...

There is mention on a website supposedly the Royce 632 mobile is the same, but I can't confirm that yet, if anybody else can let me know please !

73's Retro

 

[brandon7861]

Thanks appriciate it Tecnicoloco, but there is no schematics there of the actual sardene tin can PLL module which is filled with tons of components, that would take a long time to reverse engineer...

SAMS photofact relevant to this radio doesn't have it either nor does the users manual...

There is mention on a website supposedly the Royce 632 mobile is the same, but I can't confirm that yet, if anybody else can let me know please !

73's Retro

Did you ever find out if the 1-632 PLL schematic was the same as for the PLL in the 1-641?

 

[Retro CB Guy]

Did you ever find out if the 1-632 PLL schematic was the same as for the PLL in the 1-641?

Different for sure!

73

 

[brandon7861]

Thats a bummer... I thought they were the same. I believe the mixing crystals are the same. I found a schematic for the 632 PLL online and it shows the same crystals as the 641 unit. If I ever get my hands on one of the 641 PLLs that isn't butchered, I will make a schematic for it. I recently finished the 621 PLL schematic.

 

[Retro CB Guy]

Okay so I have the schematics diagram for the 641, I'm attaching it. Maybe I'm off base some, let me know.

73's

 

[brandon7861]

I was referring to the sealed PLL unit schematic (the thing that is just a square in the middle of that radio schematic. I think the PLL unit is the same as the 632.

 

[Retro CB Guy]

I was referring to the sealed PLL unit schematic (the thing that is just a square in the middle of that radio schematic. I think the PLL unit is the same as the 632.

Okay missed that... But in your assumption you are correct to a point. Because they used a few different PLL's. Would be one of these: TC5080/TC5081/TC5082/M58473P

73's

 

[brandon7861]

The 621 in front of me and the 632 from the online schematic both use the M58473P. I was unaware that they used different ones. Was the PLL chip choice a "by the year" sort of thing or would all 621's have the same PLL? I don't know how long they made these things...

 

[brandon7861]

Edit: I just received an email from a very notable tech that claims the 632 and the 641 use the same PLL unit. So the schematic for the 1-632 should be the right one for that 641 you have! He shared with me his schematic, I will go take a look at it right now.

 

[Retro CB Guy]

Yeah I've got like 3 Royce 641's, one used to work well. Got one recapped and it's still lacking. Pffft so I kinda gave up on those bastards LOL. Might get the DDS put in one.

 

[brandon7861]

Yeah I've got like 3 Royce 641's, one used to work well. Got one recapped and it's still lacking. Pffft so I kinda gave up on those bastards LOL. Might get the DDS put in one.

I seen a few videos where the problem was with the mechanical SSB filter, something to check out if the power is nearly zero on tx.

On the 621 I am working on, the PLL had the 10.24MHz signal, but the only other signal was about 38.5MHz. After making the schematic, I realized why. The 28.5MHz was coming from the VCO oscillating at its extreme because the PLL was out of lock due to the tripler crystal oscillator not working. I have not yet worked on fixing it because I just recently learned how to power the PLL out of the radio, but at least I know where to look now!!!