Ed Sieb wrote:
You're missimg nothing, Jack.
There is no issue, really. Hooking up 50 ohm coax to a 75 ohm anteena only
provides an SWR of 1.5:1, which is not excessive.
From a student's point of view, most of the discussions on the subject
start out with titles such as the importance of
Jim Wilhite wrote:
At one time, I found 5 different conversations on different frequencies,
so I would say the night has been a success and welcomed.
I found it a great opportunity to wring out my brand new S38B receiver.
I bought it in the morning and spent hours putzing with it. I rigged
I started my career as a ham with an S38B so yesterday I bought one to
relive the good old days.
It worked so well that I am going to set it up as my regular AM receiver.
I was not too impressed with a wire hung around the room but when I put
the dipole on it, it really came alive. After
A.R.S. - W5AMI wrote:
Jack, to just assume that one of us using a Heavy metal rig might,
or could, or does run illegal power is a slap in the face to the
many folks
To assume that my simple question assumes any such thing is a slap in my
face.
Don't troll here.
I guess if you think
kenw2dtc wrote:
Jack asked: wouldn't it be interesting to know how many of the folks
with the capability to run illegal power, didn't or never do?
I think it would be about as interesting as knowing how many people who
own automobiles ever exceeded the speed limit.
That's one way of
Donald Sanders wrote:
Jack, crystals are hard enough to find and Bry does a service to most of us
by providing a reputable source of needed crystals. Believe me he does not
get rich off his service. He provides them at 1/3 to 1/2 the cost of other
sources. Use your delete key.
If all of the
I have been hearing of Heavy Metal Night this weekend but no info on
what it is. I checked the ARRL sight and it does not seem to rise above
the horizon there.
What is this? Does a Ranger with my wife standing on it count?
js
--
PHOTO OF THE WEEK: http://schmidling.com/pow.htm
Astronomy,
John Lawson wrote:
I'm looking forward to your info - there seems to be a possible lack
in my own rather extensive collection of materials, books, papers and
publications on this subject, some reaching back now over a hundred
years
Possibly time to eat crow here. I have accepted the
John Lawson wrote:
but also the first working cathode ray tube usable for TV.
H... NOT Braun, Thomson, Zworykin, Farnsworth... but Schmidling?
I'm looking forward to your info - there seems to be a possible lack
in my own rather extensive collection of materials, books, papers
I hate to be a creep but I find it hard to believe that I am the only
one who finds your crystal peddling here just a bit tiresome and
probably in violation of the group charter.
It is one thing to offer personal gear for sale but you are clearly
promoting a business here and it should be
This seems like a good time to start putting together a Radio web page
so I have featured my current station as a Photo of the Week.
The POW started out as the Astro Photo of the Week but after about ten
years of that I sort of used up the sky. I then started posting
pictures of a General
Rick Brashear wrote:
Jack,
How far do you have to run the wire(s)?
Less than two feet. I made a new dolly for the cabinet which now
extends about 8 out the back where the transformer will be bolted.
I just need to run the HV to some sort of terminal strip and then to the
plates of the
[EMAIL PROTECTED] wrote:
I understand that there has been some AM action on the new part of the phone
band on 75/80 meters - where should I look for activity these days?
I think the best answer is to MAKE activity and stop looking for it.
Like, call CQ anywhere you are allowed to and see
Rick Brashear wrote:
If you decide to go with the GTO-15 let me know and I'll send you enough
to take care of it.
Appreciate the offer but what is it?
js
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[EMAIL PROTECTED] wrote:
I did as you are suggesting for an hour and a half this afternoon on 7130 kc
with the Harvey-Wells TBS-50 and had no response of any kind. Then I rigged
up a VFO to it and snagged a short QSO right away on 7290.
I have no experience with AM on 40 as I don't have an
KA5MIR wrote:
http://www.youtube.com/watch?v=8_eLO0exato
This is too cool. Also, they have a Triode Festival. Bet there's some
serious AM'ing going on over there.
This was my first youtube experience and I take back everything I
thought about it (all bad). The only problem is that it is
The electric fencer comes in two flavors, high impedance and low
impedance. I haven't a clue how they work as they just contain a potted
black box and some controls and leads. The functional differences are
that one is faster and lower in voltage (roughly 1pps) and the other is
higher in
Seems to me that inserting common lamp cord into clear PVC tubing, like
1/4 id, 3/8 od would make an easy to work and readily available HV
wire and also serve the purpose of grommets.
Problem is, I haven't a clue and can't seem to find any info on the
insulation resistance of this tubing.
Conor Farrell wrote:
Hey all,
I'm interested in radio DXing (I'm an astronomer and radio astronomy
is a big part of it), but as for equipment my setup goes as far as a
FM/LW/AM receiver with CD and cassette players :) My budget of time
and money wouldn't extend to much more at the moment (in
Seems like transformers are going the way of CW. After a month of
looking, posting on 3 classified sites and several mail lists, Classic
Radio Net and usenet, I am still looking for something as basic as
3000vct transformer.
I can order one new from Dahl but that sort of takes the fun out of
John Coleman ARS WA5BXO wrote:
Jack:
I really think you should consider the solid state rectifier option
for at least the other two diodes and go bridge with the XFMR. That you
have.
Did some more research on that issue and it's a cute idea but as we
discussed, the xformer has a WV of
Will an 811a fit into the same socket as an 866?
js
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John Lyles wrote:
Jack, K9ACT, before you pay Peter D. to make a new transformer, I
wanted to tell you that EBAY has transformers that meet your needs
quite often. Search under HV Transformers, and Plate Transformers as
keywords, and you will find various parts
Been there and found nothing
crawfish wrote:
Yes.
I got tricked on a socket I bought for my 866 supply. I thought all 4
pin ceramic sockets were the same as long as the hole size was the same.
I bought a pair of Johnson types only to find they were to big by
about a half inch. I had to rearrange things to get it in.
Brett gazdzinski wrote:
I think the problem is the weight.
I have a BC610 transformer, I don't want to sell it,
but if I did, it's a bit crazy to ship something that heavy.
It's only money but that is more than I need. Someone has offered me one
but I am thinking of 50 lbs max.
No matter
[EMAIL PROTECTED] wrote:
Either way, a regular 4-pin socket (ceramic preferred of course) also works
just fine. The same socket that holds your type 80 rectifier in your 1932
Philco, works just fine for the 811A.
Guess I confused things a bit. I have two nice Johnson sockets for the
811
david knepper wrote:
I am really tired of all the grumbling. Thank goodness they did not
take any frequencies from us and you know that they could.
Let's be pleased for what we got.
Before we bang our heads on the ground groveling, keep in mind that
these people owe their jobs to
There is a nice auroral display going on now (7PM CST) which started
about an hour ago.
Be interesting to see how it develops. Right now it's up about 40 degs
from the horizon with curtains, flares and fountains but no color other
than vague green.
Should be an exciting night.
js
--
ronnie.hull wrote:
who is gonna be net control for this wildness?
I think you are dreaming but we will see. Me thinks what is needed is
lots of the hated and despised QSO parties. If a bunch of people sit
around and call CQ till they get bored and another bunch roam around and
answer till
Brett gazdzinski wrote:
2000 volt center tap is going to give you about 850
to 900 volts output max.
I was affraid of something like that. Seems I got my RMS, Average and
Peak screwed up.
So before I do something dumb again, I need a 3000vct xformer to get
about 1300vdc. Is this correct?
Jay Rusgrove wrote:
js
Might be a good time for you to take a break and hit the books for a while.
It's one thing to ask for help on a particularly sticky or unusual problem
but it's another matter to pose questions that are easily answered with a
few minutes of study on your own.
I have read
D. Chester wrote:
I presume I can eliminate that drain if I drive with the Ranger and
keep it all under 500 ma?
Not sure what you mean by that. The power supply voltage will be much
more steady if you have a constant load on it.
What I meant by that is the power supply has only 500ma
Anyone have a 1955 Handbook for sale?
The only one I have is 1971 and far to modern for my needs.
The magic of 1955 is that is the year I got my Novice license.
js
--
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I really wish the Sun would avoid these outbursts
while I'm trying to build
stuff...
Steve WD8DAS
Indeed. He ruined the Noon Time Forum today. I could only hear two
checkins one of which was about 90bd below his usual and the other about
that much louder but no one else.
Same thing
[EMAIL PROTECTED] wrote:
They look nice, but the mercury vapor
rectifiers need to be treated well especially after a long idle period. You
can direct sub a 3B28 argon rectifier tube, and not have to worry about the
866s.
I took the trouble to put a window in the front panel and so, I
uvcm inc. wrote:
Mercury ref tubes of all types have mercury that sticks to the glass and
components inside.
If you need any more info be glad to help.
I have several patents in mercury vapor designs
Problem is that this stuff is not mercury at least not liquid. There is
plenty of that
D. Chester wrote:
I'm not sure how much plate voltage and current you plan to run from the
power supply, but it has been my experience with loads on the order of
2000-2500 volts at 600-700 mills or so, you don't have to worry about
the need for step-start with choke input filter using a
Anyone have a male Millen HV connector?
I only need the male part and hate to pay $17 for the set.
Thanks,
js
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Jim Wilhite wrote:
A bit of cherry red is ok. Just remember what KYV
said, don't exceed the plate dissipation of the tubes.
Roger but isn't color a function of plate dissipation?
In other words, can one use shades of red as real world indication
instead of relying on theoretical
The HV meter on my supply does not work and the series resistor inside
seems to be open. No problem but there is another component across the
resistor that I have never seen before and assume is a cap but don't
know.. it also reads open.
I posted a pic at http://schmidling.com/meter.jpg for
I just ordered a trans for my pwsup and need to work around the hi/low
step start designed into it. It uses the 220 line to provide 110 or 220
to the transformer. The new one is 110 so I do not have this option.
I plan to reroute the hi/low switch to a resistor or better yet a light
bulb to
John E. Coleman (ARS WA5BXO) wrote:
So perhaps the
other device was another resistor to adjust the value so that the meter is
more accurate than it was with just the one resistor.
Well, the bands are black (background yellow) blue. Which would be 17
meg but it is also open and it is unlikely
Rbethman wrote:
Hello All,
Take a look at W3BYM's pair of 813s modulating a pair of 813s.
A VERY robust, well designed, engineered, AND FINE sounding Homebrew!
My recommendation would be to get the back issues. The price of back
issues is $3.75 ea. The specific issues are:
Number
John E. Coleman (ARS WA5BXO) wrote:
Jack,
Check the meter with another meter and see if it is reading 1ma and is
accurate enough.
Actually, with the new 500k in the meter, it reads 10v with 10v in.
Couldn't think of anything with a higher DC voltage to calibrate with
but at least is is
John E. Coleman (ARS WA5BXO) wrote:
Jack I would dispense with the startup circuit. With the choke input filter
system and only 4mf of output capacitance you want need a start up circuit.
It's a total of 8 mf for the record but I am now thinking that the
hi/low switch was for low power tune
John Coleman ARS WA5BXO wrote:
Well then that proves that the movement is indeed a 1ma movement.
Now you need to remove the 500K ohm if you are going to be using it with an
external 5Meg else you will be 10 percent off in measurments. You could
also leave the 500K inside, and replace
Jim candela wrote:
Hey Jack, it is possible to use your two 866's or 3B28's in the positive
side of the full wave bridge rectifier(+ output), and semiconductor diodes
for the other two legs of the bridge (- output).
Interesting idea. I will keep that in mind.
js
--
PHOTO OF THE WEEK:
As a reality check, I was infuriated yesterday when an Administration
war monger declared that Iran has inflicted more injury and damage to
the US than any other country in our history.
No further comment.
Jack K9ACT
--
PHOTO OF THE WEEK: http://schmidling.com/pow.htm
Astronomy, Beer,
Brett gazdzinski wrote:
Looking for a transformer since 1955, or a power supply?
Actually, my brain.
But a pair 813's modulated by a pair of 811's was a sort of mantra in
those days. As a teenager in high school, all I could afford was an 807
modulated by a key and an S38. Now I'm rich
Gary Schafer wrote:
Now if you put two transformer secondary's in series and use a BRIDGE
rectifier you don't have the core saturation problem because there is no DC
in the individual cores. Current flows both ways in each transformer over
the full cycle.
Now that we settled that, we have
Brett gazdzinski wrote:
I would not buy anything from MFJ!
The transformers are Ameritron for whatever that is worth.
Why the big hurry, wait to find a good transformer,
they are around.
I have wanted one of these since 1955. I have waited long enough
besides, at my age, time is at a
Jim Candela wrote:
No you cannot do this. For full wave center-tap rectification the two
windings must be on the same core.
So much for that great idea.
Thanks,
js
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Astronomy, Beer, Cheese, Fiber,Gems, Sausage,Silver
Unfortunately, I just deleted the message before reading several more on
the same topic and decided I needed to defend myself.
Someone with a long sig file on Collins is complaining about my comments
on Al Gore. For some reason he has singled me out as being particularly
offensive and
I am not having much luck finding a HV xformer for my power supply so an
idea occurred to me that I would like to pass around.
MFJ has a 900v one for about $100. Is there any reason why I can not
use two of these and tie one side of the secondaries together and call
that the center tap and
John Lawson wrote:
On Tue, 5 Dec 2006, Jack Schmidling wrote:
I am not having much luck finding a HV xformer for my power supply so
an idea occurred to me that I would like to pass around.
Answer one of my emails, if you're getting them
If you're *not* getting them, well, hey
Brett gazdzinski wrote:
All the homebrew power supply decks have voltage and current meters,
then all the modulators and RF decks also have current meters.
If you run both rf and modulator off one power supply, you
get an indication on the power supply of the total current.
Now that I am used
I need some help understanding the main power switch on my powersupply.
I posted a pic to http://schmidling.com/breaker.jpg
In the on position, the top and the bottom terminals are connected.
This makes sense as this is one side of the AC line.
I can not figure out what the center terminal
Geoff Edmonson wrote:
In 1988, where was the Algore, then?
He was sitting around thinking of things to invent while we were using
them. Remember when there were 200 news groups?
'Reflector' is the proper term for the Mailing list your eyes are
currently resting on.
Never heard it
WØQFC wrote:
Maybe you could find more information by using what President Bush uses:
THE GOOGLE
I wonder if he ever googled loser or failure or whatever it was that
brought up his bio.
He probably told Larry King about how you push little buttons and things.
That what Larry asked a guest
ARS W5OMR wrote:
That Al Gore story is an urban legend.
That was but not the one about being a tree.
js
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Jim Wilhite wrote:
That is a hair splitter, Don. Al Gore took the initiative in creating
the internet. I can see how some people shortened the quote.
It doesn't take a whole lot of creativity to translate that into
inventing it.
He probably gets credit for coining the term electronic
VJB wrote:
Brian, I support your policy development regarding the
sale of items of interest to the AM Community via this
Reflector.
My brain is rebelling! What on earth is a reflector?
js
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Astronomy, Beer, Cheese, Fiber,Gems,
Brett gazdzinski wrote:
I would never use something that looked so nasty and poorly made
Actually, it is very will made, laid out and laced like mil spec. I
haven't a clue what you are talking about.
like to use parts that look like they match
Just what is it that does not match? You
Bry Carling wrote:
Brian, I support your policy development regarding the
sale of items of interest to the AM Community via this
Reflector.
My brain is rebelling! What on earth is a reflector?
It's that thing wat sits next to the driven element and the director!
Or perhaps a type of
Brett gazdzinski wrote:
Its also poor practice to put the current meter on another deck,
what happens when you want to use the power supply on something
else?
Yes indeed! How convenient to tune the RF deck while watching the plate
current meter about 3 feet below it.
The idea of putting a
VJB wrote:
The term dates back quite a while, but maybe it's
archaic now !
I have been on the Internet since before Al Gore invented it and I have
never before heard the term.
Darn thought I knew everything.
js
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Astronomy, Beer,
I need one 866A socket for my power supply. I don't know if they come
with this but the one in it is mounted on ceramic standoff's about half
an inch long.
js
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Partner Website:
I am having some quality time with my new supply and have lots of
questions about things I do not understand.
First one is, this is a choke input with a pair of 4mf's across the
output of the choke and a monster 100k bleeder.
What bothers me is that there is a 10 ohm, many watt resistor
Rbethman wrote:
Jack,
What input volts, output volts, AND power rating are you looking for?
You are faster than my fingers. That message went out before I finished
it in fact I didn't even start it.
I bought a HB powersupply today that for reasons too complicated to get
into, does
Todd, KA1KAQ wrote:
On 11/30/06, Jack Schmidling [EMAIL PROTECTED] wrote:
Jim Miller WB5OXQ wrote:
WB5OXQ will try to be there too.
Called CQ for 10 mins and heard nothing.
Were you or anyone else there?
I had a couple of SSB ops light up on the frequency about 15 minutes
before you said
Todd, KA1KAQ wrote:
Sorry about that, Jack. I did listen earlier, then the band seemed to
roll up. I shut of the tx and left the receiver running, but was in
the basement hurling firewood.
Hopefully tonight will be better?
I am booked up from 8-9 local. It's the reading hour with my honey.
Anthony W. DePrato wrote:
I have 3 or 4 left in my collection are you looking for a restored one
or one to restore ? i have both all are working .
My idea of restore is to get it working and use it. Cosmetics are not
an issue.
Email me with prices and pics (small pics).
Thanks,
js
--
Jim Miller WB5OXQ wrote:
WB5OXQ will try to be there too.
Called CQ for 10 mins and heard nothing.
Were you or anyone else there?
Jack K9ACT
- Original Message - From: Jack Schmidling [EMAIL PROTECTED]
To: Discussion of AM Radio in the Amateur Service
amradio@mailman.qth.net
[EMAIL PROTECTED] wrote:
i have a s40a
This is strictly nostalgia and has to be an S38.
Does anyone know anything about the pre-selector I keep hearing about
for it?
js
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Astronomy, Beer, Cheese, Fiber,Gems, Sausage,Silver
Todd, KA1KAQ wrote:
You sounded fabulous up here last Friday with the Bartlesville
transmitter. Wonderful audio, 20+ over S9.
I know this was addressed to someone else but one of the most pleasant
QSO's I have had recently was with Todd a couple nights ago.
There was absolute silence in
Rick Brashear wrote:
Amazing.. my spell checker gave me figure, finger and booger.
BOOGER! How did that come from figger?
If you would move out of the Stone Age and try Thunderbird, you would
quickly recognize all sorts of other wonderful features that MS doesn't
bother with.
The figger
Todd, KA1KAQ wrote:
The 'clump' factor puzzles me, too. Sure would be nice to have 3-4
QSOs going on around the band, not just 4-5 kcs away (if at all).
I have taken upon myself the task of de-clumping, first in time and
second in frequency.
I started the Noontime forum on 85 to heat up
KA5MIR wrote:
Nothing, as long as it's not your only choice.
Normally, you can generally choose your skip distance by selecting the
appropriate band for the time of day. 20 and up for longer distances. 40
short during the day and longer at night. 75 and 160 for shorter
distances.
Jim Wilhite wrote:
In my 1964 handbook there is a One-Band Kilowarr Amplifier that uses a
pair of 813s. It is grid input and would be easy to modulate using 811s
or 572Bs.
That brings up something that is confusing to me. I have been reviewing
specs to get familiar with the more popular
Mike Sawyer wrote:
Jack,
Did you mean 572's or 872's? 572's are triodes and 872's are mercury
rectifiers. I suspect you meant 572's. The 572 are ok but I'm here to tell
you that the 813 is a damn near indestructible tube! I have seen plenty of
572's that have crapped out from abuse of
[EMAIL PROTECTED] wrote:
In a message dated 11/26/06 3:27:46 PM, [EMAIL PROTECTED] writes:
Have you guys in the N.E., East West coasts had the same lack of
short skip on 75 after dark?
I do not understand this discussion and am not sure if it is good news
or bad news. But I hear it a
I am in the thinking stages of my next rig and would like some ideas.
I am thinking of a pair of 813's or maybe even 4-250's but I can't seem
to find any specific plans or designs on line.
There must be lots of them out there.
I found a thing called the 813 Maul which is 813's modulated by
I received the below message in response to our discussion about the
Ranger mod transformer.
Really nice to know that some of these companies are still around and
even willing to whip up a replacement if we really need it.
I have copied Laurie on this if anyone needs anything you can
Jim Candela wrote:
Many years ago my Astatic 'Rochelle salt crystal element died from
prolonged exposure in my garage. The output from it was low, and
distorted. With a burst of curiosity, and desperation I took the bad
element apart.
Feeling I had nothing to lose, I did just that yesterday
I did some more sig tracing and came up with some pics of where the
trouble seems to be.
Putting a 500 hz sine wave into the mic input, I see a nice sine wave
until I get to the modulator tubes.
The grid in standby looks close enough but when I go to phone mode it
gets flaky.
The plates
[EMAIL PROTECTED] wrote:
Just my opinion. I have not been following the problem. What are you
looking for??
Well, the current problem is the fact everyone complains about my audio.
Tinny, yucky, narrow... like an old telephone, etc.
New (used) D104 is the worst of the bunch but known
[EMAIL PROTECTED] wrote:
Hi Jack: You did not give any reference to the p/p amplitude of the
signals??
Missed this but I posted the numbers in a previous post but basically,
they started at about 10 mv and increased with each step but I was in
error with the 6l6 plate saying it was 50 v
Gary Schafer wrote:
Check at the center tap of the mod driver transformer with your scope and
see if you see anything there. Could be a bad or missing bypass cap there.
It's brand new but I didn't have a 15mf so I used a 47mf.. ditto for C59A.
Check the jumpers on the plug in the back to be
Rick Brashear wrote:
Jack,
The adjustable resistor (R35) has a direct affect on the screen of the
6146, so that is normal if the clamper (V6) is performing correctly.
Then why is is called the modulator screen voltage adjustment on the
schematic and used to adjust the mod current?
You may
Gary Schafer wrote:
It's beginning to sound like a partially shorted mod transformer.
I checked the resistances of the transformer earlier in the game and
they are nominal.
With 20 volts signal on the grids of the mod tubes I would think that
you should see at least 200 volts on the
Larry Taft wrote:
Just from rule of thumb for audio tube amps you should get a couple
hundred volts audio swing (not related to BIRD WATTS) at each plate to
ground. 50 v is only a couple of watts audio.
Could you explain the math on that? How do you arrive at watts knowing
only volts?
Gary Schafer wrote:
You can't reverse the plate leads on the modulator tubes
I nearly got out of bed in the middle of the night to do it but I waited
till after breakfast.
First check to see that you have proper grid current on the 6146.
2.5ma is what the manual says... no problem.
Be
A.R.S. - W5AMI wrote:
Let's back up for a minute here. Jack, I know you said you got some
bad audio reports on the air. What about the amount of audio? Did
they indicate you were under-modulated?
Yes.
Did any of these guys offer a
recording so you could hear it yourself?
No
Why did
Larry Taft wrote:
What happens when you hook the sig gen to the mic input, skipping the
D104? While you're at it do a frequency response curve of the setup.
Oft times this is an interesting test.
I don't think I have actually gone directly in but I have used 3
different mics and even an
John E. Coleman (ARS WA5BXO) wrote:
A 150 watt bulb is going to be pretty dim with just 40 watts RF but does it
brighten up with modulation at all?
Sure. This would agree with my estimate of 50% modulation.
js
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Astronomy, Beer, Cheese,
KEY5MIR wrote:
Connecting your audio generator to the mic input and tracing the sine wave
through your audio stages with an Oscilloscope can be fun and educational if
you like that kind of stuff. That might help you zero in on the problem.
Other than watching it get bigger and assuming
I can not do a freq response test because I do not have a proper sig
gen. Mine is a cheap step job and the amplitude is all over the place.
I put a 1khz sine wave into an earphone sitting on the mic and measured
p-p values with a scope
Pin 2 V7A (grid) 5mv
Pin 7 V7b
John E. Coleman (ARS WA5BXO) wrote:
Here is a quick test that might make some sense. Reduce the loading
to 50 percent of the current in the final so that the RF output is only
about 20 watts. And check the voice peaks then.
Did that makes no difference.
Really it is just a
Rick Brashear wrote:
I know this is a dumb question, but are you sure the D-104 is of the
High Z variety?
Not dumb at all. How can I tell? It puts out about 10mv ptp into a
scope. Did not measure the DC resistance because I am not sure I can
apply voltage to it safely.
js
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