Hi,

Just finishing up my big AM rig and I'm looking for a 30 to 50 Henry at 500
mA or more modulation reactor to complete it. I'd like to locate a reactor
from a 1 KW AM broadcast rig. Decent reward for the right one.

Thanks!

Chuck...K1KW

Chuck - K1KW wrote:

Hi,

Just finishing up my big AM rig and I'm looking for a 30 to 50 Henry at 500
mA or more modulation reactor to complete it. I'd like to locate a reactor
from a 1 KW AM broadcast rig. Decent reward for the right one.

Thanks!

Chuck...K1KW


What, pray tell, is a modulation 'Reactor'?

I know what a modulation transformer is.

I know what screen grid modulation is.

I know what Heising modulation is.

But ... ???

Deek wrote:

What, pray tell, is a modulation 'Reactor'?

I know what a modulation transformer is.

Ok

I know what screen grid modulation is.

OK

I know what Heising modulation is.

I don't think so... since a modulation reactor is the "heart" of both
Heising and modified Heising modulation schemes...

kindest 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:

What, pray tell, is a modulation 'Reactor'?

I know what a modulation transformer is.


Ok

I know what screen grid modulation is.


OK

I know what Heising modulation is.


I don't think so... since a modulation reactor is the "heart" of both
Heising and modified Heising modulation schemes...

kindest regards...

Heising is inefficient shunt modulation.

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

Deek wrote:

What, pray tell, is a modulation 'Reactor'?

I know what a modulation transformer is.

I know what screen grid modulation is.

I know what Heising modulation is.

snip
Hi,

A modulation reactor is a big, HV insulated audio choke used to feed
d.c. to the tube finals of a broadcast a.m. transmitter.
The modulation transformer itself is capacitively coupled
across the modulation reactor. This keeps
d.c. off the modulation transformer secondary windings,
to reduce risk of saturation.

73,
Ed Knobloch

On Jun 28, 3:47 pm, "Chuck - K1KW" wrote:
Hi,

Just finishing up my big AM rig and I'm looking for a 30 to 50 Henry at 500
mA or more modulation reactor to complete it. I'd like to locate a reactor
from a 1 KW AM broadcast rig. Decent reward for the right one.

Thanks!

Chuck...K1KW

Hi,

I'm parting out a Johnson Desk Kilowatt amplifier. Would the
modulation transformer from this unit work for you?


Thanks

Wayne kd7rur

Hi,

Thanks for the offer, but it won't work for me. I'm looking for what is
basically a choke with high inductance and specially wound for this
application with 30 to 50 H for the classic modified Heising set up in my
new rig as used in many AM broadcast transmitters.

73,
Chuck...


wrote in message
ps.com...
On Jun 28, 3:47 pm, "Chuck - K1KW" wrote:
Hi,

Just finishing up my big AM rig and I'm looking for a 30 to 50 Henry at
500
mA or more modulation reactor to complete it. I'd like to locate a
reactor
from a 1 KW AM broadcast rig. Decent reward for the right one.

Thanks!

Chuck...K1KW

Hi,

I'm parting out a Johnson Desk Kilowatt amplifier. Would the
modulation transformer from this unit work for you?


Thanks

Wayne kd7rur

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.

Edward Knobloch wrote:

SNIPPED
Hi,

A modulation reactor is a big, HV insulated audio choke used to feed
d.c. to the tube finals of a broadcast a.m. transmitter.
The modulation transformer itself is capacitively coupled
across the modulation reactor. This keeps
d.c. off the modulation transformer secondary windings,
to reduce risk of saturation.

73,
Ed Knobloch

THANKS