About my EF Johnson Blackface Messenger Two

[W5EFR]

 
Thanks to some outstanding suggestions from some other AM'ers, my Blackface Johnson Messenger 2 now sounds damn good.

So I did a little recording and Analysis...The Before and After, if you will..

The Audio, recorded straight off an RF Sampler between the transmitter and the dummy load:

Bone Stock:
http://www.riley-music.com/BowsStuff/BlackFace/StkBlackfaceAudio.mp3

Modded:
http://www.riley-music.com/BowsStuff/BlackFace/VUDUMSNGR2.mp3

The Audio Analysis:
http://www.riley-music.com/BowsStuff/BlackFace/ModdedBF.gif

Red line is the bone stock Radio
Blue line is 2 caps swapped (C24, C35)
Green line is 3 caps swapped (C24, C31, C35)

The Mods:

C24, C31, C35
Stock Values: .005 uF
Modification Values: 0.22 uF

Jumper R48 to increase power output to 8-10 watts carrier

Can you dig it?


Now I just need some Power behind this thing...

[Bacon, WA3WDR]

Whoa that sounds GOOD now!  Ha ha, the original sounded so bad that my browser crashed every time I listened to it.  But not the modded version!

[W5EFR]

Thanks for the reply Bacon.

At least you posted after listening.

It was a fun project and I am really pleased with the outcome. It is amazing how much of a difference 3 caps (and a small rack of audio processing) make.

Now I need to add some power and I'm ready for 10 meters.... I'm going to try and find another Messenger to play with...

[Ed-VA3ES]

Bow, what mic did you use in the second (improved) recording?

[W5EFR]

Bow, what mic did you use in the second (improved) recording?

MXL V57M Condensor

And then some processing...

[Steve - WB3HUZ]

Wow! Huge difference in the audio. Nice job. That voodoo woodo that you do is bad to the bone.

[W5EFR]

Thanks Steve...

Now to find the ten meter crystals...