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nomadradio's latest activity
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nomadradio replied to the thread Tram D62/Cobra 132 no transmit on 36-40.If everything is working smoothly and the tuning voltage is just clean DC voltage with no quirky spikes a meter is fine. And if a meter... -
nomadradio replied to the thread Ca 76 cobra mic.The wire that was connected to pin 4 on the old 5-pin gets added to pin 1 of the 4-pin plug, along with the shield. Don't remember...
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nomadradio replied to the thread Connex CX-3300HP low VCO voltage.Umm, what's the power supply voltage to the chip on pin 1? Should be 8 or 9 Volts DC. Might be that simple. 73
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nomadradio replied to the thread MC145106P info needed.Here's the routine. First, ground pin 6 to select the 5 kHz reference. Next, unhook all the channel selector wires and move them up one...
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nomadradio replied to the thread Tram D62/Cobra 132 no transmit on 36-40.The PLL has a finite range of tuning voltage it can deliver to the VCO. The oscillator's trimmer coil will determine what range of...
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nomadradio replied to the thread Why.Pretty sure you'll find it only does this with one mike. Sounds as if it has a short between the transmit wire and the shell of the mike...
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nomadradio replied to the thread Why.Some newer radios have the power supply's negative side connected directly to the chassis. If yours is built this way, it will still be...
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nomadradio replied to the thread Maco 300 gets 47-year tuneup..Update: The last tweak. Didn't have a 1/2 ohm resistor to put in series with the 6.3 Volt driver heaters. Used a parallel pair of 1...
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nomadradio replied to the thread Maco 300 gets 47-year tuneup..This project got sidelined when one of the customer's six 8950 tubes went "FLASH!", 'snap' and died on the spot. He had said he had...
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nomadradio replied to the thread Old uniden Grant PC409ac board.The schematic is here: https://cbtricks.org/radios/president/grant/graphics/president_grant_pc409_sch.pdf Unless the host's bandwidth...
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nomadradio replied to the thread Tram D201 caps.Hmm. Had a humorous thought. Any procedure or advice for restoring a D201 should have a graphic with the international "prohibited"...
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nomadradio replied to the thread Tram D201 caps.Years ago I had our procedure posted, probably at Grumpy's forum. It was the routine we used 20-plus years ago. As such, it would refer...
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nomadradio replied to the thread SB-200.I wish someone would sell a buffer box that uses a transistor with a full-wave bridge rectifier to resolve polarity issues. This would...
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nomadradio replied to the thread SB-200.Far as I know, the 704 is the solution to this problem. Protecting the radio from the linear's relay-circuit quirks. I was just...
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nomadradio replied to the thread SB-200.And there's a bonus. The voltage on the amplifier's keying jack is negative. No choice here but to insert a buffer box containing a...