So lately I've been having some questions come up after dealing with what I have on some rigs and wondered, If it is possible, Would it work, Should I do it, Etc...
First is, If they (OEMs) wax a couple of the cans to keep their tune, Could you possibly wax all of them instead and put some around the VR trimmers aswell so everything holds it tune? Right kind of wax that is.
Second is, Modulation limiters. Here lately, clipping them has become a big issue. But we all know what happens when you do and when you don't. And clipping that diode disables the entire AMC circuit, Yes.
So, Instead of clipping it or lifting a leg which I prefer, Why not put a resistor inline with it to cut down how much voltage it receives so it doesn't slam back so hard? I have two radios currently, BOTH will touch 14-15 watts then get slammed back to 5-7 and a meter that shown it at only 40-45%. I also have two techs that one, who did the alignment swear they're at 100% using his scope and SA. Another who hasn't ever seen them said the meter used is junk and wrong. But wait, They'll kiss 15 but the meter showing only 40-45% is wrong.... Lets do some math. If you take 45% of 15, What is that? Correct 6.75. Here, I even had google confirm my "old school" math.
https://www.google.com/search?q=8%+of+15+is+what&rlz=1C1EODB___US623US623&oq=8%+of+15+is+what&aqs=chrome..69i57.4104j0j1&sourceid=chrome&ie=UTF-8#q=45%+of+15+is+what
Now, if I'm "averaging", meaning it stays close to that for the most part, 6-7 watts PEP output but will hit 14-15 before limiter kicks in, That tells me, I AM running 45% total mod and the meter was not lying but that the "tech" did not tune as he said he did. He did specify though that instead of an almost industry standard of 1kHz at 30 mv, He did 1 kHz at 10 mv. Claims it doesn't matter as the AMC kicks in at 3mv so it is adjusted properly. He also said to do a RX alignment, He goes by a SINAD meter and not "factory procedure". I also have a power imbalance. One side will do slightly more than the other. For example: 40 will do 7 watts PEP but 1 will only get to 5. Also, DK levels are different on both sides. Hell, Both radios do different levels yet were aligned the same... One can't even key up on 36-40 without twitching hard like it isn't getting enough power to fully key. But later on it will but has a delay of about a half second. $40 per radio and they're still basically stock. He wants me to send them back so he "Can look at them." Afraid to at this point. But anyway. So I did a small very unscientific test. Carefully noting current position of VR so to return it when done, I used my phone and a 1khz test tone with full phone volume right at mic screen. Not only does the AMC ignore the tone and some tones(Sweeping) push the radio further than others, but once the VR goes so far, so does the output and further turning does nothing. SO, without clipping it, Could one use say a 1K resistor inline with diode instead? I did put the VR back as it was set. But have a few other rigs I'd like to try this on. Namely one thats already been clipped and has been for years. I actually have videos of what they're doing....
Third, Where can one get a SA and scope or a combined unit without spending a two weeks paycheck for it? Even a SDR type would be fine for me. Gives the same results.
You're dying from laughter now aren't you? Thought so. Now, I'll kick back and watch everyone put in their thoughts and opinions on all this.
First is, If they (OEMs) wax a couple of the cans to keep their tune, Could you possibly wax all of them instead and put some around the VR trimmers aswell so everything holds it tune? Right kind of wax that is.
Second is, Modulation limiters. Here lately, clipping them has become a big issue. But we all know what happens when you do and when you don't. And clipping that diode disables the entire AMC circuit, Yes.
So, Instead of clipping it or lifting a leg which I prefer, Why not put a resistor inline with it to cut down how much voltage it receives so it doesn't slam back so hard? I have two radios currently, BOTH will touch 14-15 watts then get slammed back to 5-7 and a meter that shown it at only 40-45%. I also have two techs that one, who did the alignment swear they're at 100% using his scope and SA. Another who hasn't ever seen them said the meter used is junk and wrong. But wait, They'll kiss 15 but the meter showing only 40-45% is wrong.... Lets do some math. If you take 45% of 15, What is that? Correct 6.75. Here, I even had google confirm my "old school" math.
https://www.google.com/search?q=8%+of+15+is+what&rlz=1C1EODB___US623US623&oq=8%+of+15+is+what&aqs=chrome..69i57.4104j0j1&sourceid=chrome&ie=UTF-8#q=45%+of+15+is+what
Now, if I'm "averaging", meaning it stays close to that for the most part, 6-7 watts PEP output but will hit 14-15 before limiter kicks in, That tells me, I AM running 45% total mod and the meter was not lying but that the "tech" did not tune as he said he did. He did specify though that instead of an almost industry standard of 1kHz at 30 mv, He did 1 kHz at 10 mv. Claims it doesn't matter as the AMC kicks in at 3mv so it is adjusted properly. He also said to do a RX alignment, He goes by a SINAD meter and not "factory procedure". I also have a power imbalance. One side will do slightly more than the other. For example: 40 will do 7 watts PEP but 1 will only get to 5. Also, DK levels are different on both sides. Hell, Both radios do different levels yet were aligned the same... One can't even key up on 36-40 without twitching hard like it isn't getting enough power to fully key. But later on it will but has a delay of about a half second. $40 per radio and they're still basically stock. He wants me to send them back so he "Can look at them." Afraid to at this point. But anyway. So I did a small very unscientific test. Carefully noting current position of VR so to return it when done, I used my phone and a 1khz test tone with full phone volume right at mic screen. Not only does the AMC ignore the tone and some tones(Sweeping) push the radio further than others, but once the VR goes so far, so does the output and further turning does nothing. SO, without clipping it, Could one use say a 1K resistor inline with diode instead? I did put the VR back as it was set. But have a few other rigs I'd like to try this on. Namely one thats already been clipped and has been for years. I actually have videos of what they're doing....
Third, Where can one get a SA and scope or a combined unit without spending a two weeks paycheck for it? Even a SDR type would be fine for me. Gives the same results.
You're dying from laughter now aren't you? Thought so. Now, I'll kick back and watch everyone put in their thoughts and opinions on all this.
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