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Post by treeclimber on Jan 8, 2022 20:50:02 GMT -5
D201 was sent out for full freshen up back in 2004. Job complete verified and sent back to owner. Shipping box never opened until now. Upon first try rec’v is great but no transmission. Key mic and it clicks relay and sounds like a fading static in the speaker which i expect is the ping. Tubes were shipped separate and were installed before testing. Any thing i can suggest to the new owner to look for ?
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Post by 2600 on Jan 9, 2022 1:23:35 GMT -5
I would start by cleaning the pins on the chassis, and spring contacts around the edge of the balanced modulator board. You'll have to pull out the board, find a tiny brush like they use to clean electric razors and clean each spring contact with a suitable solvent. We use 99% isopropyl. Likewise, cotton swabs work well to scrub the flat faces of the pins that the board plugs into.
If this doesn't bring back transmit, do you have a way to verify that the 6.2565 MHz crystal at the rear of this board is running when you key the mike? If it receives okay on BOTH sidebands, the carrier crystal probably isn't the culprit. The carrier crystal used for LSB provides the transmit carrier in AM mode. A shortwave or ham radio that can tune in 6.2565 MHz is one way to be sure this signal is working inside the radio when you key the mike.
The relay and mode selector would be the next suspects. Moving parts and metal-to-metal contact surfaces that get oxidized cause a lot of the headaches in a D201.
Anyone who was born the year it was last serviced is old enough for a driver's license. More than long enough for oxidation to be part or all of the picture.
73
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Post by treeclimber on Jan 10, 2022 2:11:51 GMT -5
Thank you, I will follow up on all of your suggestions and post again. In your opinion, is there a more modern radio that has equal audio output quality and power? Just curious knowing that the radio is a legend I wondered if any of the newer radios could ever compete?
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Post by 2600 on Jan 12, 2022 1:07:41 GMT -5
In theory, a digital signal processor should be capable of imitating the sound of any radio.
Until some clever programmer works that out, you're in the same boat as the guitar players with their tube-type amps.
73
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Post by treeclimber on Jan 12, 2022 3:18:18 GMT -5
Roger that. I completely understand. Thanks and 73’s
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