[AMRadio] D-104 modifications


cemilton at aol.com cemilton at aol.com
Thu Aug 26 19:06:37 EDT 2010


Have to agree with John................cut the preamp and use the crystal mic direct.  Great audio.  A scope on the output waveform will be helpful when setting up the audio.  And it's important to remember that the "voice" of the person transmitting has as much effect on "good audio" as anything.

Back in the days, we (transmitter engineers) knew which announcer (say ham radio operator here) was on the air and whether his voice was "positive" or "negative".  Had little to do with the announcers audience.  We could watch the transmitter modulation and, IF necessary, reverse the polarity of the audio signal so that the particular "voice" would modulate nicely.  Some announcers had crap voices and nothing helped.  But, none of them ever made it to major market status either................................

So if one sounds like George Patton (actual, not George C. Scott movie voice) no mic is going to make you sound great. 

However, the D-104 is easy to engineer.  Drop all the bells and whistles.........just a nice crystal mic element driving the first audio stage.  Terminate it properly.  And have fun.

YMMV.............and comments invited.

Broadcast engineers????  Any comments?

73 de W4MIL
Chuck
Palm Coast,FL

CCA 458

Remember, the government cannot give anything to anyone that they have
not first taken away from someone else.




-----Original Message-----
From: John <johndtate at post.com>
To: amradio <amradio at mailman.qth.net>
Sent: Thu, Aug 26, 2010 5:51 pm
Subject: Re: [AMRadio] D-104 modifications


What's there to modify?  Just bypass the dumb preamp and use the Hi-Z 
rystal directly into your Hi-Z input speech amp and you have a GREAT 
M mic!

----Original Message-----
rom: Phil LaMarche <plamarc1 at verizon.net>
o: 'Discussion of AM Radio in the Amateur Service' 
amradio at mailman.qth.net>
ent: Thu, Aug 26, 2010 2:57 pm
ubject: [AMRadio] D-104 modifications

've lost the call and email address of the ham who modifies the D-104 
or
etter AM audio.  Can anyone share, please?
Phil
Philip LaMarche
LaMarche Enterprises, Inc
hil at LaMarcheEnterprises.com
ww.LaMarcheEnterprises.com <http://www.lamarcheenterprises.com/>
727-944-3226
27-937-8834 Fax
27-510-5038 Cell
www.w9dvm.com <http://www.w9dvm.com/>
K3 #1605
CCA 98-00827
RA 1701
9DVM

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