[BC] AM Plate Modulation Concept

[DANA PUOPOLO]

A friend of mine had a DX-100 with a modified modulator stage. I believe it
had a UTC transformer in it. The whole rig was modified for high fidelity. It
was flat from 30 Hz - 6 Khz. Sounded great when used with an RE-16.

-D

------ Original Message ------
Received: 
From: "Richard Fry" <rfry at adams.net>
To: "Broadcast List" <broadcast at radiolists.net>
Subject: [BC] AM Plate Modulation Concept

Nat Kayl wrote:
>Don't you mean the DX-40?  As I recall the DX-35 was CW-only.
__________________

Actually I was the one posting that statement.  The DX-35 did use 
controlled carrier AM.  I bought, built and used one in the mid 1950s, so 
I'm real sure about that.  The DX-40 did also - it superseded the DX-35 in 
~ 1958.

Below is a write-up I pulled off a Google search:

DX-35: Heathkit DX-35. Crystal-controlled phone & CW transmitter. 6146 
final amplifier providing 65 watt plate power input on CW, with 
controlled-carrier modulation peaks up to 50 watts on phone. Built in 
modulator and power supplies, covers 80, 40, 20, 15, 11, and 10 meters with 
a single band-change switch. Pi network output. Tubes: 12BY7 oscillator, 
12BY7 buffer and 6146 final. Speech amplifier 12AX7, 12AU7 is used as 
modulater. Panel control: switch selection of three different crystals 
(reached through access door at rear). Panel meter indicate final grid 
current or final plate current.

RF 



_______________________________________________
This is the BROADCAST mailing list
To send to the list, email: broadcast at radiolists.net
For sub changes, archives and info on this other lists:
http://www.radiolists.net/