You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
A foot switch works. Just be sure to press it before keying the mike, and release it only after the radio is back in receive mode.
Don't know how well this toy fits in one of those. Plenty of room for it in the "black" radio base stations.
Shameless plug, does the job...
The brown wire does come loose from the CCW lug of the fine control. That's because the brown wire connects to the receive-only 8 Volts and we're going full-time with the clarifier. As a rule, this allows a useful "fine" tuning range. To increase the coverage of the Fine knob, a resistor goes...
My recollection of the cassette version was that the player mechanism only engaged the takeup spool, not the supply spool. Upshot was that only a fairly high-grade cassette would even play without 'warble' to the playback speed. Without a spindle to hold it centered, the supply-side spool will...
Whoa!
Not something I remember thinking about at all. Don't know if I'll ever use another Soviet-era vacuum relay or not, but that sounds like a hair-pulling lesson there.
Thanks, Neil.
73
I do vaguely remember a 23-channel indash combo called a 45 or 50, maybe?
Pretty sure we ditched the last of the parts radios of that kind. A couple of them brought $4.98 on fleabay. The ones that didn't sell went to the cruncher.
Finding a working sample you can make a daily driver will...
As a rule they are "flying" above the solder side of the pcb. The white screen print on the component side of the board does not show them. Uniden added them as a band-aid 'update' to the radio after the first production runs were sold.
73
A wattmeter reading and a counter that ignores it tells us that there is a whole list of broken stuff here, maybe? A broken counter that someone fried with his linear will probably read zero. Forty years ago when inline counters were popular, lightning was the big risk, leaving them in line...
The big posts are for the meter coil.
The small ones lead to a tungsten lamp that cares not about polarity. Was probably meant to use the 6.3 Volts AC that lights up the tube heaters.
73
Just run, don't walk the other way from the model "CE-2".
It was a breakthrough design 60 years ago, but they have both breakdown issues and rare-part issues. Not a good combination.
The higher the model number, the newer the item. Oughta come up with a calendar, showing the production year...
This tells us you need bigger guns than what you're pointing at it now. Do you know if the radio receives the channel number on the display?
Having a frequency counter in line with the radio would tell us where the radio think's it's transmitting. Or maybe also receiving.
73
D51 is toast. It will kill as many final transistors as you allow it it. Can be replaced in a pinch with a 1N4148, but some resistor values might have to be tweaked if VR16 turns down, but not enough. Can't remember this substitute pushing VR16 to the other direction, where it won't turn up far...
Mostly I tell people DON'T BOTHER!
Any radio that tunes the transmit side in steps of 1/10 kHz can be tuned about as well as any CBer will bother. This lets you use the front-panel clarifier to fine-tune the receiver alone.
A radio that travels a full 10 kHz or more per click really needs...
AM transmit won't tell us anything useful from that measurement.
VR16 controls the transistor's collector current with *NO* drive power. The "NO" part is important, since the carrier drive fed to the final in AM mode disrupts this measurement totally. VR16 controls how much heat the final...
www.expresspcb.com
Based in Mulino Oregon, with more than one facility. Pricier than China, but I have had excellent results from them since 1999. They were the very first fab to accept an uploaded CAD file over the world-wiley web and send you boards, far as I know.
73
VR16, the final transistor's bias control is famous for getting blown out when a final fails. Turning it tends not to show much difference after it gets damaged. It is such a common risk, we change VR16 unless it looks new, just to prevent aggravation later.
D51 is also a risk, along with D66...
To the best of my knowledge, a bipolar electrolytic works just fine in a DC circuit. They just cost more than the conventional DC-only varieties.
Only the premium you paid for them over and above the price of the RIGHT cap is what got wasted if they do the job.
73
This forum does not allow a single user to have more than one username. If anyone wants to change their username contact an admin and it will be done. Multiple accounts belonging to the same member will be deleted without warning.