President Mc Kinley Modulation Probs

Hi  Miura
I had my rig set up with a suitable thin screw driver ,as Nicky had told me the pots are very delicate so be careful . I had another radio set up near by so could listen as I turned the pot up.
The Mckinley had a Kpo NM532 mic set between 1/4 and 1/2 way turned up. As I did a count down you turn the pot up until the modulation sounds good as Nicky said I went to far and the audio cut out so just turn it back until the audio came back then a little more so your not at the cut off point. 

Hope this helps 

Regards John

Many thanks for your help John!!    

thanks for that John i will see how it goes

which is a decent power mic for the mc kinley as im home based maybe i don't need a noise cancelling one, thanks

skyrider wrote:

which is a decent power mic for the mc kinley as im home based maybe i don't need a noise cancelling one, thanks

I can't answer from experience but the K-PO mic seems a good replacement for many, especially the 6900.

Hiya skyrider

Hi from all I have seen and read about it seems the NM-532  KPO power mic is a good around choice , have the mic set about 1/4 to 1/2 way when you do the modulation turn up and my choice was to set the mic gain on rig down a couple notches seems best for me. Hope this helps .

Regards John

Definitely K-PO 532. It gives the punch the standard mic lacks. Never try to fit an Astatic to a President McKinley as they can’t work together for some reason. On the other hand Rangers radios work best with the Astatic D104-M6B. Go figure!

thanks for your info guys 

Hi all, found an issue with a McKinley recently that caused much of the same modulation problem that you described. found R221 open circuit to Q203. this affected SSB modulation and RF power. I removed rR221 cleaned the contact pads and re-soldered, everything worked fine after. Hope this will help someone in the future. solder dry joints can be hard to find.

Thanks for the heads up Ollie.

73's Gary.

C.T. Admin.

Hi Everyone

Sorry its been awhile but it has turned out perfect with modulation tune I have had very good reports from everyone. Happy days .

Tonyvic wrote:

Tonyvic wrote:

BASS 666 wrote:

how do you know your modulation is bad ?

I can confirm John's Modulation is terrible on ssb but on fm it's fine (R5) but quiet.
I think I have a recording of it, will post it tomorrow if I have.

I found the recording but I bet John doesn't know what he altered between the first and last part of the clip! (The last 15-20 seconds is about the best I have heard even on the many tests that we have done with just the two of us).
Johns Audio

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