[AMRadio] Better AM audio for a EF Johnson Messenger2


Bow kd5kzn at sbcglobal.net
Wed May 30 04:38:47 EDT 2007


Those Banana Mics sound like poo!

You want it? It is in pretty good shape and I unsoldered the wires from
their connection points, nothing was cut. I removed it today when I
installed a mic Jack in the side of the Chassis, where the factory left a
hole for one. ;)

Got anything to trade?

Bow

W5EFR


-----Original Message-----
From: amradio-bounces at mailman.qth.net
[mailto:amradio-bounces at mailman.qth.net] On Behalf Of Bob Peters
Sent: Monday, May 28, 2007 21:57
To: 'Discussion of AM Radio in the Amateur Service'
Subject: RE: [AMRadio] Better AM audio for a EF Johnson Messenger2

Bow that Banana mike was a great Mike but a D-104 amplified would serve you
better...If you don't want the banana and if it is chrome in good shape I
would love to buy it from you...I collect great mikes...

Thanks  Bob W1PE Dallas

-----Original Message-----
From: amradio-bounces at mailman.qth.net
[mailto:amradio-bounces at mailman.qth.net] On Behalf Of Bow
Sent: Tuesday, May 29, 2007 12:54 AM
To: 'Discussion of AM Radio in the Amateur Service'
Subject: [AMRadio] Better AM audio for a EF Johnson Messenger2


 
Hey all,

Has anyone here ever played with a Johnson Messenger (or Messenger Two) CB
on 10 meters? I am looking for suggestions on how to get better sounding
audio out of the one I have. The Hardwired Crystal "Banana"
microphone is coming off ASAP and I plan on inputting audio from my rack
gear, or using a more modern dynamic microphone.

But I know this thing has to have some audio bandwidth bottlenecks.

Has anyone ever used one on the air?

The schematic is here:
http://www.cbtricks.com/radios/ef_johnson/messenger_2/graphics/messenger
_2_s
ch.jpg

For Starters, I think C24 needs to be increased to .22uf, to let some low
end through.

Any other suggestions?


Bow

W5EFR


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