Measuring AVC voltage?

1/11/2011 7:47:57 PMDaniel M.

Hi All,
I just recapped a Capehart, model TC-20 and would like to know how to measure the AVC voltage. The radio plays fine but want to do a alignment and would like to learn how the AVC works in this radio.

Thank you kindly!!!!!

Daniel M.

1/11/2011 8:10:09 PMTerry Decker

:Hi All,
: I just recapped a Capehart, model TC-20 and would like to know how to measure the AVC voltage. The radio plays fine but want to do a alignment and would like to learn how the AVC works in this radio.
:
:Thank you kindly!!!!!
:
:Daniel M.
:
Please see my comment on Mitch's thread. AVC and alignment are NOT connected. In fact, using the AVC voltage can cause much more harm than good. Any reputable service info will tell you to disable the AVC when doing an alignment, or set the generator attenuator low enough not to activate it. You can measure the AVC at the high end of the volume control, or the output of the last IF. Use a cap to block any DC, and do not use a digital meter.
This info is direct from three different sources that I am looking at right now.
Terry

1/11/2011 8:27:31 PMWarren

Agree with Terry about this. You can use the AVC line, but it's a delicate balance of attenuating the RF input below AVC activation. Need a vtvm, looking for the most negative voltage on the AVC during alignment. Any over saturation your not doing any good.

1/11/2011 9:42:59 PMDaniel M.

::Hi All,
:: I just recapped a Capehart, model TC-20 and would like to know how to measure the AVC voltage. The radio plays fine but want to do a alignment and would like to learn how the AVC works in this radio.
::
::Thank you kindly!!!!!
::
::Daniel M.
::
:Please see my comment on Mitch's thread. AVC and alignment are NOT connected. In fact, using the AVC voltage can cause much more harm than good. Any reputable service info will tell you to disable the AVC when doing an alignment, or set the generator attenuator low enough not to activate it. You can measure the AVC at the high end of the volume control, or the output of the last IF. Use a cap to block any DC, and do not use a digital meter.
:This info is direct from three different sources that I am looking at right now.
:Terry
:
Thank you Kindly, I will check the post to learn more!! Thank you again for the help!! Daniel M.

1/13/2011 5:44:11 PMEdd

Sir Daniel. . . . .

See how this info helps you out on your current alignment situation on that unit.

> > > AM Radio Alignment < < <

73's de Edd

:::Hi All,
::: I just recapped a Capehart, model TC-20 and would like to know how to measure the AVC voltage. The radio plays fine but want to do a alignment and would like to learn how the AVC works in this radio.
:::
:::Thank you kindly!!!!!
:::
:::Daniel M.
:::

::Please see my comment on Mitch's thread. AVC and alignment are NOT connected. In fact, using the AVC voltage can cause much more harm than good. Any reputable service info will tell you to disable the AVC when doing an alignment, or set the generator attenuator low enough not to activate it. You can measure the AVC at the high end of the volume control, or the output of the last IF. Use a cap to block any DC, and do not use a digital meter.
::This info is direct from three different sources that I am looking at right now.
::Terry
::
:Thank you Kindly, I will check the post to learn more!! Thank you again for the help!! Daniel M.
: