[AMRadio] re: Apache audio not good

[Jordan Arndt]

Here is a copy of a previous message regarding this ...

Recently, someone asked about Apache mods on this list.  Couldn't find
my list at the time, but here is what I have now:

All these mods will be found in QST:

May, '59, p.44, Review of the TX.
Jun '59, p.62, Correcting Grid Current
Dec '59, p. 52, Spotting Switch Mod (I did not find this desireable on
mine)
Mar '60, p. 48, Adjustment Made Easy

Ignore any mods to the modulator or speech amp.  All the "problems"
reported about this section of the TX were the result of poorly written
Heath instructions about how to set the compression threshhold and the
modulation level, as well as very poor mechanical design which put the
actual mike level control inside the cabinet where it has to be reached
with a small slotted screwdriver through the key jack, and the
compression threshold control on the front panel where the volume
control normally would be.  Good luck to anyone who can find the slot in
the control through the key jack!  Read the instructions VERY carefully,
and the proper method of setting up the modulation will eventually
become clear.

agn 73.... Jordan....

Jordan Arndt wrote:

> Ron... there is an audio limiter pot located inside the rig... I believe it is adjustable through the key jack (?)... it is usually the reason the rigs were called " Scratchy Apache".. it is usually set for too much limiting... 73 de Jordan...
>
> Ron Samchuk wrote:
>
> > Hi again...
> >     Thanks for all the advice and suggestions received so far concerning the Apache and Mohawk.  I had one person asking me to be more specific on what I was prepared to do.  I don't want to make major changes or modifications, but simply have a good signal with acceptable AM audio.
> >     For example, I used the Apache last night... power output was fine, everything loaded up OK, but I could tell on the scope that the pattern was not good.  It looked like vertical scratches rather than a nice envelope.  Contacts tried to be nice, but did say it sounded very much on the high frequency side, with one person saying that he could receive me better on ssb setting.  The microphone used here is an amplified D-104; being careful not to have too much audio gain.  Something I have not done is grounded the rigs so there is a possibility of course that perhaps rf is getting into the audio.
> >     So any suggestions as to what to check or mods would be appreciated.  Thanks in adance for any comments.  Ron VE4SR (VE4 Super Rabbit)
> >
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