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Things took a turn....
I did not have a lot of extra time for working on this radio but I couldn't resist hooking up a VR in place of R249. The result was interesting. I was able to "peak" the wattage reading using the VR and it turned to to read 156ohms. I did have to switch to a 500ohm pot as the setup that Andy suggested peaked out at the max adjustment and I thought there was more in it. Here is the interesting part of the result. The modulation based on the audio from the bench radio was a little improved but not a ton. I did try a different radio to test the bench radio out and it "boomed" through the bench radio with the same test mic. One last, and very frustrating result. I noticed that I had my meter set on the 5 watt scale instead of the 25 watt scale which I had been using. I remembered that I had it on the lower scale so I could verify the low power setting on the radio. For some reason, at max power (front knob and VR 14) the radio is now only putting out 3.5 watts. The sine wave is perfect on the scope, modulation shows up as clean. What have I done????? The truth is, I am tired and need to walk away. Tomorrow will be another day with a clearer head.

<blockquote data-quote="Lkaskel" data-source="post: 781638" data-attributes="member: 50403">Things took a turn....I did not have a lot of extra time for working on this radio but I couldn&#039;t resist hooking up a VR in place of R249.&nbsp; The result was interesting.&nbsp; I was able to &quot;peak&quot; the wattage reading using the VR and it turned to to read 156ohms.&nbsp; I did have to switch to a 500ohm pot as the setup that Andy suggested peaked out at the max adjustment and I thought there was more in it.&nbsp; Here is the interesting part of the result.&nbsp; The modulation based on the audio from the bench radio was a little improved but not a ton.&nbsp; I did try a different radio to test the bench radio out and it &quot;boomed&quot; through the bench radio with the same test mic.&nbsp; One last, and very frustrating result.&nbsp; I noticed that I had my meter set on the 5 watt scale instead of the 25 watt scale which I had been using.&nbsp; I remembered that I had it on the lower scale so I could verify the low power setting on the radio.&nbsp; For some reason, at max power (front knob and VR 14) the radio is now only putting out 3.5 watts.&nbsp; The sine wave is perfect on the scope, modulation shows up as clean.&nbsp; What have I done?????&nbsp; The truth is, I am tired and need to walk away.&nbsp; Tomorrow will be another day with a clearer head.</blockquote>

[QUOTE="Lkaskel, post: 781638, member: 50403"] Things took a turn.... I did not have a lot of extra time for working on this radio but I couldn't resist hooking up a VR in place of R249. The result was interesting. I was able to "peak" the wattage reading using the VR and it turned to to read 156ohms. I did have to switch to a 500ohm pot as the setup that Andy suggested peaked out at the max adjustment and I thought there was more in it. Here is the interesting part of the result. The modulation based on the audio from the bench radio was a little improved but not a ton. I did try a different radio to test the bench radio out and it "boomed" through the bench radio with the same test mic. One last, and very frustrating result. I noticed that I had my meter set on the 5 watt scale instead of the 25 watt scale which I had been using. I remembered that I had it on the lower scale so I could verify the low power setting on the radio. For some reason, at max power (front knob and VR 14) the radio is now only putting out 3.5 watts. The sine wave is perfect on the scope, modulation shows up as clean. What have I done????? The truth is, I am tired and need to walk away. Tomorrow will be another day with a clearer head. [/QUOTE]

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