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GE 3-5825A Clarifier Unlock
- Thread starter Probate
- Start date
Hmm. That radio is absent from online info sources. I'll see if I can find Howard Sams volume CB-153 next time I'm at work.
The process always has two steps. First, disable the source of transmit-only voltage feeding the PLL's clarifier circuit. Second, unhook the front-panel clarifier from the receive-only power source and patch it to a continuous source of regulated DC voltage. Some of those Cybernet-made radios required a small 5-Volt regulator chip mounted across the clarifier control's outer lugs to do this. Or you could use a zener diode. Just can't remember specifics for that model.
I'll be back later if I can find CB-153.
73
The process always has two steps. First, disable the source of transmit-only voltage feeding the PLL's clarifier circuit. Second, unhook the front-panel clarifier from the receive-only power source and patch it to a continuous source of regulated DC voltage. Some of those Cybernet-made radios required a small 5-Volt regulator chip mounted across the clarifier control's outer lugs to do this. Or you could use a zener diode. Just can't remember specifics for that model.
I'll be back later if I can find CB-153.
73
Whups! Volume CB-153 is AWOL from my collection. Might turn up, but no good way to predict. Had all 293 volumes at one time. How many are really missing and how many just got "put down" in the wrong place? No idea.
If it turns up I'll check back.
73
If it turns up I'll check back.
73
Whats the board number? If it is PTBM058COX, that's also used in the Lafayette Telsat SSB-140. I think it might also be similar to the Hygain 5, but not 100% sure.
I have a schematic for the SSB-140 if the board numbers match.
I have a schematic for the SSB-140 if the board numbers match.
If it is the same as the SSB 140 look here.
www.worldwidedx.com
73
Jeff
Lafayette Telsat SSB 140 TX Offset?
Hi Gang, I have on the bench a Telsat SSB 140. The oscillator alignment is perfect but the radio is not transmitting on frequency. There is not a TX offset so I am curious how you match the TX frequency with the receive? The clarifier is not unlocked. Any thoughts? I have checked other...
73
Jeff
Thought the A was the single board and the B was the dual board. It was mentioned in this video:
I will have to check. I have one here that is a dual board. I *thought* it was an "A", but maybe I'm wrong. If it is a single board, it will be similar to all of the Cybernet SSB 02A chassis radios.
3-5825A is the single board like the one in the Telsat SSB140
3-5825B is the double board like the ones in the GE Superbase
For the A (the same as the SSB140
PLL02A PTBM048A0X LAFAYETTE TELSAT SSB140
- Remove diode D-5
- Lift (disconnect) resistor R24 other side from D4 ie: leave D4 end of R24 as is
- Feed constant 9.4v supply from mode switch (check with meter) to the on-connected end of R-24
**you will need to re-align the frequencies after the mod...
3-5825B is the double board like the ones in the GE Superbase
For the A (the same as the SSB140
PLL02A PTBM048A0X LAFAYETTE TELSAT SSB140
- Remove diode D-5
- Lift (disconnect) resistor R24 other side from D4 ie: leave D4 end of R24 as is
- Feed constant 9.4v supply from mode switch (check with meter) to the on-connected end of R-24
**you will need to re-align the frequencies after the mod...
Could just pull the clarifier knob off and recenter it on the pot. That way you can wear out the 1o'clock part of the wiper path instead of where it already wore from years past at the noon position.
I've never done that so I will need to let other comment on that logic. I will say that this radio has an indent at 12 o'clock so the control kinda stays there. I guess that is a prevention from the accidental bump.
I appreciate the reply and I will perform this by the weekend. Do you know which pots are for am,lsb,usb for frequency?