Uniden 505XL

[KK4JW]

Anyone have any mod info to share on the 505XL?

Thanks!

 

[nomadradio]

I remember the PRO 500, and the PRO 510. But I never remember seeing a 505.

73

 

[KK4JW]

I remember the PRO 500, and the PRO 510. But I never remember seeing a 505.

73

 

[9C1Driver]

On many of those smaller radio's the most you can do is bump the modulation pot a tad. Beyond that you slap a KL-60 or Kl-203 behind one. That's bang for the buck.

 

[Shadetree Mechanic]

I found a clue: I would probably not do the power mod, but the limiter defeat might work well. I clipped the diode in my 510 and the modulation came right up and did not over modulate without it. The 505 might be different in that regard. Only one way to find out.

 

[Shadetree Mechanic]

 

[nomadradio]

As a general thing, first find the spike diode. Should be easy to spot, just follow traces from the audio tranformer pins until one of them leads to the anode of a black epoxy 1-Amp rectifier diode. On the diode's other end is the cathode, the end with the band on it. The trace it feeds into is our modulated B+ that will power and modulate the driver and final transistors. Downstream from the diode you'll find a small-value electrolytic capacitor, almost always under 10uf with the positive end connected to the modulated B+ line, and the negative side connected to a diode. Remove the solder from one side of this capacitor to break the circuit and see if it affects the modulation limit. Good chance it will.

73

 

[Squints]

How about direct injectiin hifi audio mod for the 5

 

[Squints]

The newer 505s have a completely different circuit board in them from what you guys posted was an older radio

 

[nomadradio]

Not so different from cars or trucks made years apart. They never stop tweaking their manufacturing process, and the circuit board will change even though the model number stays the same.

73

 

[9C1Driver]

How about direct injectiin hifi audio mod for the 5

Can't tell if your being funny or serious. This is a 40 dollar throw away radio new, 15 bucks used. It's probably dinky little surface mount parts, bump the modulation and run a better mic. Done.

 

[nomadradio]

Hey, the desire to modify never goes away, even as the barriers to doing it get higher and higher. Besides, if I was going to risk screwing up a radio with a 'direct' mod, the cheaper the better.

73