this has been fun, building the little 6L6 transmitter, and I'm still looking
forward to that first qso today sometime with it
I'm curious, do any of you ever build low power modulators with these rigs
and try to make contacts on AM?
I head a 807 rig modulated by 6L6's ( I think ) a few weeks
I have the same phenomenon with the 872's or 575's (whichever
happen to be installed) in a homebrew rig. 3 light but one is
dark, and the phenomenon stays at that socket. No obvious other
issues.. how curious.
PJ
From: Merz Donald S [EMAIL PROTECTED]
Subject: [AMRadio] N3RHT Shack Update
3B28's have a sort of white glow in the gas, right?
I have the same phenomenon with the 872's or 575's (whichever happen to be
installed) in a homebrew rig. 3 light but one is dark, and the phenomenon
stays at that socket. No obvious other issues.. how curious.
Make sure the tube filament pins are making good contact. I have seen it
fail
3B28's have a sort of white glow in the gas, right?
Usually the is no immediately visible glow at all. If you carefully peer
down inside the plate/filament structure, you will see a dim violet glow.
You may have to turn off the lights to notice it.
Don k4kyv
Ronnie,
It's amazing what you can do with 10-15 watts AM. There isn't much
headroom for QSB, or QRM however. That makes the challenge all that more
rewarding when you get a good signal report. Now combine that 15 watts with
a Heath SB-220, and you're one of the big-dogs.
I hope
I have just purchased a 610 and going to use it xtal control. I have xtals
for 75 meters in FT243
holders. I am told that there is an adapter available for the large
xtals. If so does someone have one they will part with??? or does anyone
know the part ## to ask for...Have a whole month to
Darrell, WA5VGO has the 807 modulated by 6L6s I think Ronnie. Of course any
rig Darrell has sounds very good.
73 Jim
W5JO
- Original Message -
From: ronnie.hull [EMAIL PROTECTED]
To: amradio@mailman.qth.net
Sent: Sunday, March 06, 2005 6:03 AM
Subject: [AMRadio] anyone for qrp am?
My question would be
Does the FT-243 have tha ability to take the current/power that the FT-171-B
xtals are designed for?
There MUST be a reason that they are designed the way that they are.
Bob - N0DGN
I have just purchased a 610 and going to use it xtal control. I have xtals
for 75
Bob:
If you find the adapter, please let me know. I have two of the large
crystals, but that's it.
I don't have a BC-610, mine is the HT4-B, but they are, I think, very
similar.
I've used mine on 160 75 with the VFO that is built into each tuning unit.
It drifts a lot for about the
In a message dated 3/6/05 11:36:09 AM, [EMAIL PROTECTED] writes:
My question would be
Does the FT-243 have tha ability to take the current/power that the FT-171-B
xtals are designed for?
Open up some of the later FT-171-B holders any you'll find an FT-243 size
xtal inside.
On the
Hello Bob,
Congrats on acquiring a BC-61 (Beastie 610)!!
There is aWW II documentary DVD available which has a 28 min. story by
Hallicrafters about the conversion of the HT-4 to military use showing ass'y
line production testing plus building the SC-299 mobile carrier for it.
The DVD is called
If it helps any, the crystal socket on a beastly 610 tuning unit
perfectly fits a double banana plug. Mount a standard FT-243 holder on
a double plug and voila, instant adapatron.
Also, a recent issue of Electric Radio featured a simple cure for the
FM hum that is common to the BC-610 VFO.
Back in the 90s there was a flurry of QRP AM activity in the Northeast.
Known as PW (for P*** Weak)and included award certificates and nets. Max
carrier level was 10 watts with a lower power sub-class. Brain child of K1JJ
as
I remember. I ran a 9 watt rig , 6AV5 PA modulated by a
I, also,would like to build a QRP AM rig. I have the 6L6's and 1625's.
What I need is a modulation trandformer. Any suggestions, anyone? Thanks.
73, Ed Richards K6UUZ
AMI member #1534
On Sun, 6 Mar 2005 13:33:33 -0600 Jim Wilhite [EMAIL PROTECTED]
writes:
Darrell, WA5VGO has the 807 modulated
Was a good answer...
If it helps any, the crystal socket on a beastly 610 tuning unit perfectly
fits a double banana plug. Mount a standard FT-243 holder on a double plug
and voila, instant adapatron.
Also, a recent issue of Electric Radio featured a simple cure for the FM
hum that is
In a message dated 3/6/05 1:40:13 PM, [EMAIL PROTECTED] writes:
I, also,would like to build a QRP AM rig. I have the 6L6's and 1625's.
What I need is a modulation trandformer. Any suggestions, anyone? Thanks.
For a plate modulator that works great and does not require a hard-to-find
Another alternative is series modulation. This has efficiency issues using a
class A series modulator, but for low power AM this might be the ticket.
At the following link are two circuits that I found somewhere, and am just
passing them on. I never tried them.
Regards,
Jim
WD5JKO
Several years ago the ARRL mobile manual and handbook had several 20 watt
range mobile single and multiband rigs usinf 2E26, 807, etc. finals with
modulators. I built a couple monoband for 40 and 20 and was able to several
hundred miles consistantly on 40. I built a 28-9er with 3 watts out on ten
In a message dated 3/6/05 3:02:36 PM, [EMAIL PROTECTED] writes:
Another alternative is series modulation. This has efficiency issues using
a
class A series modulator, but for low power AM this might be the ticket.
At the following link are two circuits that I found somewhere, and am just
Thanks, Jim.
73, Ed Richards K6UUZ
AMI member #1534
On Sun, 6 Mar 2005 17:02:06 -0600 Jim candela [EMAIL PROTECTED]
writes:
Another alternative is series modulation. This has efficiency issues
using a
class A series modulator, but for low power AM this might be the
ticket.
At the
FT-243 xtals should work ok. The BC-610 was designed just before WW2. At
that time xtals usually came in a round holder about the size of a
half-dollar, with two pins that fit into a standard 5-pin tube socket (the
pin spacing was not the same as that of the BC-610 xtals, though). I think
Ronnie: First, congrats on the Lil 6L6 riG !! Hope to work you on it.
Just curious why you chose 7123 ?? Do you have a rock there ??
As to Low Power AM, I think we need to exercise little rigs like the
AF-67 and Gonset Commanders etc. (which I possess). There is some low
power activity on about
I am curious if anyone is using a pre-WW2 version of the HT-4. What kind
of crystal holder did it use? Was it identical to the one in the wartime
BC-610?
Donald:
My HT4-B was made in 1938, and uses the same TU's (and crystals) that the
BC-610 uses.
While we are on off-beat questions
Dennis,
I don't have the 1954 Handbook to look at the article but, by
definition, the series modulator is hooked up so that the entire power
supply voltage going to the final is varied in accordance with the bias
or audio on the modulator. It is High Level Plate Modulation, and the
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