Deek wrote:

Heising is inefficient shunt modulation.

Very good, now you've learned what Heising modulation is and how it's
done (what components are used, etc.). Yes, Heising is inefficient, but
it has two huge pluses as well: 1) it can be "added" to almost any
transmitter with little modification (which can then be easily removed);
and 2) it can provide excellent fidelity. So while it may be
inefficient - it remains a very popular way to add AM to transmitters.

best regards...
--
randy guttery

A Tender Tale - a page dedicated to those Ships and Crews
so vital to the United States Silent Service:
http://tendertale.com

Randy or Sherry Guttery wrote:
Deek wrote:

Heising is inefficient shunt modulation.


Very good, now you've learned what Heising modulation is and how it's
done (what components are used, etc.). Yes, Heising is inefficient, but
it has two huge pluses as well: 1) it can be "added" to almost any
transmitter with little modification (which can then be easily removed);
and 2) it can provide excellent fidelity. So while it may be
inefficient - it remains a very popular way to add AM to transmitters.

best regards...

I learned what Heising Modulation was back in the early 50s while earning an EE
degree. Your sarcasm is misplaced.

Deek wrote:

I learned what Heising Modulation was back in the early 50s while
earning an EE degree. Your sarcasm is misplaced.

Obviously, then, you forgot how Heising Modulation worked, or you
wouldn't have asked the question; and (hopeful) you've re-learned / been
reminded - how Heising Modulation works, specifically the use of a
modulation reactor as specified by the OP; - no sarcasm intended.

To "pick a nit" - Mr. Knobloch's description is only partially correct -
in that his description is of a *modified* Heising modulator. A
saturable reactor can also be used in a circuit without "capacitively
coupling an output of a modulation transformer" (i.e. no modulation
transformer at all) - which is a basic / original Heising modulator (as
opposed to a modified Heising).

early 50s: That is a long time. I've carried an FCC 1st since 66
- (when I was 16) added RADAR endorsement in 78. Still have my license
hanging on one last commercial AM broadcast transmitter, though I'd like
to retire from that one as well (at one time I had over a dozen AM&FM
stations here under my license).

You can see the last "tantrum" that transmitter threw he

http://www.comcents.com/rg/mw5.html

best regards...
--
randy guttery

A Tender Tale - a page dedicated to those Ships and Crews
so vital to the United States Silent Service:
http://tendertale.com

"Randy or Sherry Guttery" wrote in message
. ..
Deek wrote:

I early 50s: That is a long time. I've carried an FCC 1st since
66
- (when I was 16) added RADAR endorsement in 78. Still have my license
hanging on one last commercial AM broadcast transmitter, though I'd like
to retire from that one as well (at one time I had over a dozen AM&FM
stations here under my license).

--
randy guttery

A Tender Tale - a page dedicated to those Ships and Crews
so vital to the United States Silent Service:
http://tendertale.com

Small world! I got my 1st back in either 65 or 66 in high school. Working
transmitter summer relief was a lot better than picking tobacco with the
other high school kids back then.

Pete

Uncle Peter wrote:

Small world! I got my 1st back in either 65 or 66 in high school. Working
transmitter summer relief was a lot better than picking tobacco with the
other high school kids back then.


Hey Pete!

Yes, indeed... it also allowed a "wet behind the ears" kid to hang
around a radio station and meet some interesting characters. In my
case - helping to move a studio from the basement of a church to more
"suitable" digs... and getting to meet some of the deejays... I'll
never forget sitting on the board riding the gain while Dr. Demento cut
loose with a visitor: if you ever heard the Wolfman's howl live - you'd
never ever forget it!!!

best regards...
--
randy guttery

A Tender Tale - a page dedicated to those Ships and Crews
so vital to the United States Silent Service:
http://tendertale.com