wa2mze(spamless) wrote:

Back in '66-'67 there
were still some people on AM (mostly on 80 and 10 meters), but today
it's completly gone.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

You need to get out more. AM is alive and well on both 160 and 75
meters every day, and on ten meters when it's open.

Bill, W6WRT

On Sun, 22 Jan 2006 15:17:47 -0500, "wa2mze(spamless)"
wrote:


You might as well leave out the
AM modulator since it will be useless today. Back in '66-'67 there
were still some people on AM (mostly on 80 and 10 meters), but today
it's completly gone.

Thats interesting, I wonder what mode I was using on 2m last Sunday
morning?.
It was an AM qso over a distance of about 90 miles, received an R5-S3
and gave an R5-S2. Both of us were running about 2.5w
--

Forgot. 3885 is an AM freq and I think 7295, but not sure. You'll also
hear some on 160.
73, K9DCI


"Mike W" wrote in message
...
On Sun, 22 Jan 2006 15:17:47 -0500, "wa2mze(spamless)"
wrote:


You might as well leave out the
AM modulator since it will be useless today. Back in '66-'67 there
were still some people on AM (mostly on 80 and 10 meters), but today
it's completly gone.

Thats interesting, I wonder what mode I was using on 2m last Sunday
morning?.
It was an AM qso over a distance of about 90 miles, received an R5-S3
and gave an R5-S2. Both of us were running about 2.5w
--

Mike W wrote:
On Sun, 22 Jan 2006 15:17:47 -0500, "wa2mze(spamless)"
wrote:



You might as well leave out the
AM modulator since it will be useless today. Back in '66-'67 there
were still some people on AM (mostly on 80 and 10 meters), but today
it's completly gone.


Thats interesting, I wonder what mode I was using on 2m last Sunday
morning?.
It was an AM qso over a distance of about 90 miles, received an R5-S3
and gave an R5-S2. Both of us were running about 2.5w
--


I remember having a Gonset 2m communicator I as a novice.
Is there any am left on 2m? Can those new multi mode rigs
even transmit on am?

I never said AM doesn't have it's place. It's gone as a DX mode,
but on a quiet band is great for rag chewing.

I'm considering building the am/cw transmitter in the 1966 handbook
(probably in others, too). It runs a single 6146 ....
I built a similar rig, but it was weakly based on that design.
Mine had a 6GK6 oscillator and a 6146 final....

I was thinking of building a simple rig again but with a 1625 in the final.
I have about a dozen of these bottles in the junk box ....

When I find the right round tuit I want to use TEN 1625's with their
filaments series'd across the 120 VAC line in a simple CW rig. Can't
find it right now, but somewhere around here I have an article from
an old radio magazine describing just such a transmitter.

IIRC, the capacitance from ten tubes limited it to the lower HF band(s),
but it still seems like an easy way to get 750 watts!
--
--Myron A. Calhoun.
Five boxes preserve our freedoms: soap, ballot, witness, jury, and cartridge
PhD EE (retired). "Barbershop" tenor. CDL(PTXS). W0PBV. (785) 539-4448
NRA Life Member and Certified Instructor (Home Firearm Safety, Rifle, Pistol)

I was thinking of building a simple rig again but with a 1625 in the
final.
I have about a dozen of these bottles in the junk box ....

When I find the right round tuit I want to use TEN 1625's with their
filaments series'd across the 120 VAC line in a simple CW rig. Can't
find it right now, but somewhere around here I have an article from
an old radio magazine describing just such a transmitter.

IIRC, the capacitance from ten tubes limited it to the lower HF band(s),
but it still seems like an easy way to get 750 watts!
--
--Myron A. Calhoun.

Hey, Man, I don't know about TEN 1625's, but I did try five 1625's (in
parallel, of course) and could work up to 40 CW....... (as an American in
France, F7CT). Almost 1000VDC on the plates, and they did get pretty rosy
on a long "dah". 1625's could be drawn by the basket full from the MARS
storeroom at Toul Rosieres Air Base, France. 1962......1963?
Old Chief Lynn...... W7LTQ

Lynn Coffelt wrote:
I was thinking of building a simple rig again but with a 1625 in the

final.

I have about a dozen of these bottles in the junk box ....

When I find the right round tuit I want to use TEN 1625's with their
filaments series'd across the 120 VAC line in a simple CW rig. Can't
find it right now, but somewhere around here I have an article from
an old radio magazine describing just such a transmitter.

IIRC, the capacitance from ten tubes limited it to the lower HF band(s),
but it still seems like an easy way to get 750 watts!
--
--Myron A. Calhoun.


Hey, Man, I don't know about TEN 1625's, but I did try five 1625's (in
parallel, of course) and could work up to 40 CW....... (as an American in
France, F7CT). Almost 1000VDC on the plates, and they did get pretty rosy
on a long "dah". 1625's could be drawn by the basket full from the MARS
storeroom at Toul Rosieres Air Base, France. 1962......1963?
Old Chief Lynn...... W7LTQ


Let's see... the output C of an 807 (1625 is the same) is 7pf, the input C
is 12pf. With 10 tubes thats 70pf output and 120pf input. Won't work
at all on 10m, and iffy on 20. Would be fine on 80 and 40.

"wa2mze(spamless)" wrote in message
...
Jeffrey Bauman wrote:
I'm considering building the am/cw transmitter in the 1966 handbook
(probably in others, too). It runs a single 6146 in the final.

I am curious if anyone has ever built that rig. If I build it, it will
probably be with an outboard power supply, and a single switch for input
/
tank band switching.

Also curious: Anyone ever homebrewed a DX-60?

Jeff
W8KZW


I built a similar rig, but it was weakly based on that design.
Mine had a 6GK6 oscillator and a 6146 final. It was built inside
a chassis with the tubes mounted on a subchassis inside. The tubes
were "sideways" and holes were drilled in the chassis-cabinet for
ventilation.

I am assuming the same transmitter was described in the 1967 HB (which
was the first HB I ever bought). You might as well leave out the
AM modulator since it will be useless today. Back in '66-'67 there
were still some people on AM (mostly on 80 and 10 meters), but today
it's completly gone. Low cost SSB xcvrs wiped out AM by the mid 1970's.

I was thinking of building a simple rig again but with a 1625 in the
final.
I have about a dozen of these bottles in the junk box along with half as
many
6AG7's. The crystals will be the scarce items these days (well expensive
anyway).


Just curious why you think the AM modulator will be "useless today" ?????
I'll have to tell those AMers running DX-?? equipment to stop talking into
the mic, right?

Dan/W4NTI

Dan/W4NTI wrote:
"wa2mze(spamless)" wrote in message
...

Jeffrey Bauman wrote:

I'm considering building the am/cw transmitter in the 1966 handbook
(probably in others, too). It runs a single 6146 in the final.

I am curious if anyone has ever built that rig. If I build it, it will
probably be with an outboard power supply, and a single switch for input
/
tank band switching.

Also curious: Anyone ever homebrewed a DX-60?

Jeff
W8KZW



I built a similar rig, but it was weakly based on that design.
Mine had a 6GK6 oscillator and a 6146 final. It was built inside
a chassis with the tubes mounted on a subchassis inside. The tubes
were "sideways" and holes were drilled in the chassis-cabinet for
ventilation.

I am assuming the same transmitter was described in the 1967 HB (which
was the first HB I ever bought). You might as well leave out the
AM modulator since it will be useless today. Back in '66-'67 there
were still some people on AM (mostly on 80 and 10 meters), but today
it's completly gone. Low cost SSB xcvrs wiped out AM by the mid 1970's.

I was thinking of building a simple rig again but with a 1625 in the
final.
I have about a dozen of these bottles in the junk box along with half as
many
6AG7's. The crystals will be the scarce items these days (well expensive
anyway).



Just curious why you think the AM modulator will be "useless today" ?????
I'll have to tell those AMers running DX-?? equipment to stop talking into
the mic, right?

Dan/W4NTI


I stand corrected that some people are still rag chewing on AM.
I never did like the screen modulator's though. No punch.

Jeffrey Bauman wrote:
I'm considering building the am/cw transmitter in the 1966 handbook
(probably in others, too). It runs a single 6146 in the final.

I am curious if anyone has ever built that rig. If I build it, it will
probably be with an outboard power supply, and a single switch for input /
tank band switching.

Not that exact rig, but I've built similar 6146 transmitters. One
gotcha with the oscillator-final setup is that you may not end up with
enough drive on 21 and 28 MHz, if those bands matter to you. The Eico
720 improves on this by using a buffer/multiplier.

I like the Eico 720 design, but a weakness is lack of VR regulation
leading to chirp (especially if you multiply up.)

The handbook transmitter doesn't include a clamping tube, so if for
some reason you have no or insufficient drive you can find your final
tube dissipating too much power and melting down. But, elsewhere in
that handbook you will find several examples of clampers.

Bandswitching and plate choke resonances are easier to deal with if you
limit yourself to 2 bands or so (say 80 and 40 or 40 and 20).

Every handbook from the late 40's up through the early 70's has a CW
transmitter rig of similar spirit, earlier ones using a 1625 or 807 or
something similar.

Tim.