The NC-183 and NC-183D are essentially bandswitched versions of the
HRO-50 and HRO-60. The difference between the HRO-50 and 60 is that
the 60 uses double conversion on higher bands. Similarly, the
NC-183D uses double conversion while the plain old NC-183 does not.
All four receivers hav
Back in the 50's and 60's almost nothing was shipped by air --
certainly nothing as heavy as a Johnson Valiant or a Heath Apache.
But I have had a Valiant shipped to me, and it cost me nothing! My
friend constructed a wooden frame to hold the rig inside of a very
large cardboard box. Ther
Hey Dennis did you ever forget to remove a clip lead and hit the HV
button?
I'll plead guilty to that one. The old RCA klystron-based UHF
transmitters ran 18-25 KV, depending on the model with supplies that
were capable of delivering a dozen or so amps all day, every day.
They were
If the stick is solidly grounded (I don't mean an alligator clip
lead attached to a chassis point), why couldn't the shorting stick
be a solid conductor, for example, a brass or copper rod?
I was wondering exactly the same thing. I suppose that if there is
enough energy in the circuit --
isn't loaded. The same thing applies here. Anything inside a
transmitter should always be considered as energized until you short
it directly to ground. Only then is it safe to touch. There is no
such thing as being too cautious with this stuff.
Alan
WA2DZL
On Jun 2, 2006, at 3:1
A resistor is considerably less reliable than a piece of heavy gauge
wire or braid connected directly to ground. You use the shorting
stick as a safeguard after everything is supposedly made safe. If
it's not really safe, then you live to tell the story about the big
bang and the blinding
For what it's worth, I am the proud owner of a BC-610F. It has many
fewer safety features than the much higher powered transmitters that
I've worked with professionally. Except for the exciter controls, I
never touch anything inside without shorting whatever it is to
ground. Even the exc
Rick,
I've seen sticks that were anywhere from a bit over a foot to three
feet long. As far as material choice, even a good wooden broomstick
or dowel seems like a good bet, because the business end is well
grounded.
BTW, I didn't mean to come on so strong in the original post. It's
j
On my homebrew KW, I built in an interlock on the door that is
opened for access to the plug-in coils, since these run with full
modulated HV on them when the transmitter is operating. I would
never try to change coils with the rig in TX position. The more
redundancy the better. When I
Sorry about that. I put the URL in the original posting. For those
who missed it, here it is again: http://www.linuxjournal.com/article/
8224
On Nov 19, 2005, at 7:22 PM, Kenneth G. Gordon wrote:
So what is the URL/address?
Ken W7EKB
Folks,
Earlier this week I posted the link to a ve
Folks,
Earlier this week I posted the link to a very interesting
modification for the National SW-54 that was outlined in the November
Issue of Linux Journal. Unfortunately, no sooner did I post the
link, then the Linux Journal servers in the midst of a denial of
service attack.
The at
All,
Linux Journal for November, 2005 has a really interesting
modification for the National SW-54. You can read it here: http://
www.linuxjournal.com/article/8224
For what it's worth, I sort of like the idea.
73's
Alan
WA2DZL
Because the power companies don't own the phone lines.
Alan
WA2DZL
On Aug 17, 2005, at 10:35 AM, John E. Coleman (ARS WA5BXO) wrote:
What I don't quite understand, is why it is easier or cheaper to do
broadband over power lines than over phone lines. Phone lines are
already
balanced lines
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.
Actually, I believe that the circuit for the Millen 90801 exciter is,
in fact, in the December, 1952 issue of QST. The reason that you
didn't find it, is because the the circuit is used in a complete novice
transmitter project by George Grammer called, "75 Watts with an Economy
Power Supply."
It would be interesting to see exactly how much current is flowing
through the meter. Try hooking the lead from the smoothing choke to
the other terminal of the meter. Now, if the same phenomena is present
you can read the current flow. Also, it just seems like an interesting
thing to try ju
While we are on the subject, I too have a 639 ribbon mic. Mine is the
A model, which only has three patterns. Both the ribbon and dynamic
sections of my microphone work, but the switch wafer rotted out a while
back and I need a wiring diagram to repair the microphone. I did find
a manual for
voice that appeared between the beeps.
I dont know if it still works or not.
On Sat, 13 Nov 2004 09:02:03 -0500, Alan Cohen <[EMAIL PROTECTED]>
wrote:
It seems to me that the cult existed long before NPR ever reported it.
They certainly were not the ones who released a CD of number station
f the other garbage on commercial radio
these days.
Alan Cohen
WA2DZL
On Nov 13, 2004, at 7:20 AM, Mark Foltarz wrote:
Funny how NPR and the liberal media freaks mentioned in the story
can take
something like a UTE such as a number station and turn it in to a
cult! I
remember when I act
All this talk about W9TO's famous keyer has me wondering about several
things.
It was probably the most successful electronic key produced up until
the 1970's. Hallicrafters built a boatload of the things in the early
60's. So many in fact, that they are still a common item at hamfests
and
I forget to mention that the article is in the edition of the handbook
copyrighted in 1962.
I hope that helps.
Alan
WA2DZL
A detailed construction article about to build a W9TO keyer may be
found in Bill Orr's "West Coast" handbook on pages 597 - 600. The unit
in the handbook seems to have
A detailed construction article about to build a W9TO keyer may be
found in Bill Orr's "West Coast" handbook on pages 597 - 600. The unit
in the handbook seems to have a circuit that is identical to the T.O.
keyers commercially manufactured by Hallicrafters.
Alan
WA2DZL
On Aug 12, 2004, at
Actually, the Apache used 6CA7/EL-34's as modulators. The finals were
a pair of 6146's.
Alan
WA2DZL
On Jan 5, 2004, at 10:12 PM, Tommye & Jim Wilhite wrote:
This is correct. Very little difference except for cabinet design.
The
Apache used 6146s as mod tubes.
73 Jim
de W5JO
- Origi
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