You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
The Feb 2025 Radioddity Giveaway Results are In! Click Here to see who won!

Reply to thread

Message

WOW

Hello all,

Interesting thread..

If you clip D129 you will disable the AMC Limiter.
The AM limit transistor will no longer function as designed.

I have that mod posted on my 2510 site, because it was a common modification to disable the AM limiter(it was suggested to me to include it on my site)

I suggest in the 2510, the AM Mic Gain mod :
micgain
that adds a resistor to the transistor leg, increasing the limited AMC control to function closer to 100% adjustment. (typical 2510 circuitry limits the AMC to 70 - 75% modulation MAX.)

So this resistor mod moves the adjustment limit to closer to 100%.

It doesn't necessarily increase audio, it doesnt clamp it to a max of 70%.
Meaning after the mod, if you add a power mic, the AMC can be adjusted to allow more Modulation.

To go on record.. I dont recommend removing AMC Limiters. It can cause splatter, and undesirable results.

If your interested see this link, detailing audio, clipping and such:
Amplitude Modulation

Roger

<blockquote data-quote="Rogerbird1" data-source="post: 178087" data-attributes="member: 20">WOWHello all, Interesting thread..If you clip D129 you will disable the AMC Limiter.The AM limit transistor will no longer function as designed. I have that mod posted on my 2510 site, because it was a common modification to disable the AM limiter(it was suggested to me to include it on my site)I suggest in the 2510, the AM Mic Gain mod :<a href="http://www.cbtricks.com/rogerbird/2510/micgain.htm" target="_blank">micgain</a>&nbsp;that adds a resistor to the transistor leg, increasing the limited AMC control to function closer to 100% adjustment. (typical 2510 circuitry limits the AMC to 70 - 75% modulation MAX.) So this resistor mod moves the adjustment limit to closer to 100%.It doesn&#039;t necessarily increase audio, it doesnt clamp it to a max of 70%.Meaning after the mod, if you add a power mic, the AMC can be adjusted to allow more Modulation. To go on record.. I dont recommend removing AMC Limiters.&nbsp; It can cause splatter, and undesirable results. If your interested see this link, detailing audio, clipping and such:<a href="http://www.williamson-labs.com/480_am.htm" target="_blank">Amplitude Modulation</a>Roger</blockquote>

[QUOTE="Rogerbird1, post: 178087, member: 20"] [b]WOW[/b] Hello all, Interesting thread.. If you clip D129 you will disable the AMC Limiter. The AM limit transistor will no longer function as designed. I have that mod posted on my 2510 site, because it was a common modification to disable the AM limiter(it was suggested to me to include it on my site) I suggest in the 2510, the AM Mic Gain mod : [url=http://www.cbtricks.com/rogerbird/2510/micgain.htm]micgain[/url] that adds a resistor to the transistor leg, increasing the limited AMC control to function closer to 100% adjustment. (typical 2510 circuitry limits the AMC to 70 - 75% modulation MAX.) So this resistor mod moves the adjustment limit to closer to 100%. It doesn't necessarily increase audio, it doesnt clamp it to a max of 70%. Meaning after the mod, if you add a power mic, the AMC can be adjusted to allow more Modulation. To go on record.. I dont recommend removing AMC Limiters. It can cause splatter, and undesirable results. If your interested see this link, detailing audio, clipping and such: [url=http://www.williamson-labs.com/480_am.htm]Amplitude Modulation[/url] Roger [/QUOTE]

Top Bottom