Uniden Madison Swing Mod

[357]

I have a Uniden Madison PC-411 here and when I volt the final, the audio sounds like crap, like its crunchie and garbled.

On the Cobra 2000 it sounds great.

What gives?

 

[9C1Driver]

The Uniden madison, Uniden Washington, and Cobra 2000 were never intended to be heavy swingers. Exotic mods and final swaps are not suggested with any of these radios. Volting finals in radios is not a good idea either unless maybe you have a newer mosfet powered radio. They love higher voltage levels.

 

[Jaydean]

I agree. For the small amount of extra power gained it's not worth heating up the final transistors.

 

[Shadetree Mechanic]

The power supply in the Madison is hardly adequate to run a stock radio. Usually running it from an external supply will let it develop stock power levels.

 

[Robb]

Yeah. Radios that have mods that benefit AM does so at the cost of SSB. Now, if you value SSB; then any of these mods are less than worthless. If you really must have a real swingin' AM rig; then why not have a dedicated Cobra 25LTD? Not as tho you can't afford one - right?

I sometimes talk to guys on SSB that had their radios modded for AM modulation, and it sounds like real junk on SSB! Can't have both - apparently . . .

 

[Shadetree Mechanic]

I think the Stryker 955 is one of the few radios that does both well.

 

[Robb]

I think the Stryker 955 is one of the few radios that does both well.

So do the older Galaxy radios, such as the 959. So long as they aren't modded either, they do just as poorly as other radios do when modded. Had to restore and repair so many radios on my meager bench because of those 'mods', it isn't even funny.

 

[ExitThirteen]

Just do my asymmetric modulation mod that's buried in the modifications page. It'll work fine. Do not volt the final, it's not necessary with my mod. Make sure all modulation limiters are intact, and upgrade the AM pass regulator to a TIP41C, follow the instructions, and it'll sound great.


~Cheers~

 

[sonoma]

Exitthirteen for some reason I can not find the mod you are talking about. I wanted to see what you had done. can you post the link to it. Thank you Sonoma

 

[ExitThirteen]

This is the thread. I think on page 3 or 4, I get into the mod and the dynamics, although I no longer have the scope pictures up.


https://www.worldwidedx.com/threads/over-130-modulation.163831/page-4



(Edit): It's not pinned. Sorry about the confusion!

 

[AudioShockwav]

I did not open it back up, but I did stick it to the top.

73
Jeff

 

[sonoma]

thank you exit 13 and Audioshockwave for pinning it to the top. I never knew you called it an asymetric mod. I forgot about this post since it was back in 2014 you posted it..
just set here and reread it from start to finish so I would know what was totally in it.
thanks