Astatic Silver K Eagle, Schematic

[W6TOM]

  Picked up a nice looking Astatic Silver K Eagle amplified microphone at a swap this weekend, the head tests fine on another stand. It looks like the amplifier board is bad, this board is unlike any I have seen, it has small relays and is special made for the Silver K Eagle base. I could use a schematic for it, I haven't been able to find one on the net. Here is a picture of the amp and the base

[MikeKE0ZUinkcmo]

Light years away from 1 and 2 transistor, single sided boards typically found in the base of D104s.

Looks like some sort of multilayer board from the 70's or 80's.  Maybe an audio processor of some sort, with at least 4 IC's a few transistors and .1" spacing connectors.   The connectors alone make me think its not original to the mic.  What type of connector is on the end of the mic cord?

Good luck, I'm genuinely interested in the results of this quest.

Mike  

[KD6VXI]

It's original.   The base has a K beep in it.   A CW Roger beep that bangs our a K in CW at the end of every transmission.

Just what you've been missing on 75 meters.

CB microphone.   Gut the base,  MPF102 it.

--Shane
KD6VXI

[MikeKE0ZUinkcmo]

Hard to believe someone would have spent money on one of those, but it seems that's the nature of Fads.   I'd guess they weren't cheap either.

[W6TOM]

  No connector on the mic cord, sure don't want some CB "courtesy tone" at the end of each transmission. The stand looks very nice and the microphone head seems to work OK too. I used that on the D-104 I use on my ART-13 and got good audio reports. Paid $20 for the mic which I think was a good deal

  I went into a CB shop years ago, the had a little board you could put in your microphone call a Missouri Mule Fart, I can only imagine!! That among other things is why CB never appealed to me.

  Thanks for the info!!

[W6TOM]

  The amplifier board is not the same as the D-104's that have just the PTT lever on the handle. A few years ago I bought a bunch of very rough looking D-104 stands from a guy at a swap for a few dollars thinking the parts might be useful at a later date.

   Tonight I went looking for those stands, one poor pitted specimen was a Silver Eagle with what appears to be the standard amplifier board. I put the head from the Silver Eagle I got last weekend on the stand and installed a 9 volt battery. It appears to work!! Looks like after I install that board and a bit of rewiring I'm in business!

[Opcom]

Decades ago I built a few noise toys using 2-transistor multivibtator with envelope modulator and voltage controlled time constants controlled by diode logic. beware of cheap copies.