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What are these pots?

brizzotheizzo

Member
Joined
Aug 7, 2016
Messages
52
Can anyone clarify what these pots are for on a Uniden 980.
Rt-204 and L207.
I’m 99% sure L207 is final output power. But what is RT-204 FNL IDL. Trying to figure out what the difference in these two pods are. Can’t find any schematics online anywhere. Does anyone at least have any “educated guess“?
 

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a417

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Joined
Mar 14, 2004
Messages
1,522
Wouldn't L207 be the filled inductor coil in the center? I don't think that's a pot.

And RT on a printed PCB is usually a thermistor.
 

prcguy

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Joined
Jun 30, 2006
Messages
9,569
Location
So Cal - Richardson, TX - Tewksbury, MA
There is a Youtube video that points out the few, very few internal controls that you can touch to improve the transmitter. You can't do much with a 980, like its not going to put out much more power but you can turn down the AM modulation limiter to allow 100% mod, adjust the ALC so sideband power is a little more peppy and I remember an adjustable inductor that you can tweak on AM with full modulation that will get a little more peak power out. That's about it and I would have a peak reading wattmeter and/or oscilloscope handy for making these adjustments.
 

brizzotheizzo

Member
Joined
Aug 7, 2016
Messages
52
There is a Youtube video that points out the few, very few internal controls that you can touch to improve the transmitter. You can't do much with a 980, like its not going to put out much more power but you can turn down the AM modulation limiter to allow 100% mod, adjust the ALC so sideband power is a little more peppy and I remember an adjustable inductor that you can tweak on AM with full modulation that will get a little more peak power out. That's about it and I would have a peak reading wattmeter and/or oscilloscope handy for making these adjustments.
Yeah, I wasn’t trying to golden screwdriver anything. Just interested in the layout of the board.
 
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