ernational Crystal. I've bought many
crystals from them and all were perfect. They know the
parameters for Drake crystals.
You might want to post also to the "other" drake list
at:
http://groups.yahoo.com/group/DrakeRadio/
It seems to me this is a fairly common problem.
No messages for a couple of weeks so testing.
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Richard Knoppow
Los Angeles
WB6KBL
dickb...@ix.netcom.com
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There is a data sheet with wiring diagram at:
<http://cdn.shure.com/user_guide/upload/381/us_pro_404c_ug_27a179_ja_.pdf>
--
Richard Knoppow
Los Angeles
WB6KBL
dickb...@ix.netcom.com
- Original Message -
From:
To:
Sent: Thursday, June 26, 2014 1:50 PM
Subject: [Dra
fails the tubes burn up. They have become quite
expensive.
--
Richard Knoppow
Los Angeles
WB6KBL
dickb...@ix.netcom.com
- Original Message -
From:
To:
Sent: Thursday, May 29, 2014 6:36 PM
Subject: [Drakelist] TR-4 Audio Hum Question
Thanks to Gary and John for their response to my
wer and
intelligibility.
If at all possible listen to your own signal on an
independent receiver for both quality and spurious signals.
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getting. Also, do you have
an oscilloscope capable of working at the transmitted
frequency? If so the wave form can tell you a lot.
Post more detail and we will analyze the problem.
Also, get more signal reports, maybe the fellow complaining
has a bad receiver.
--
Richard Knoppow
Los Angeles
-Original Message-
>From: Dino Papas
>Sent: Jan 14, 2014 12:53 PM
>To: Mail List - Drake Gear
>Subject: Re: [Drakelist] Good evening, Drakelist
>
>I’d venture to say that anytime you see a message with ONLY a web link in the
>message block that should make you run for the hills. One
es the
tube to run hot.
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moi and will hear anything
the R4B will. Its quite amazing but the R4B still has better
selectivity.
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me in rural
Michigan. When I was a kid snow was FUN! That's because I
didn't have to shovel it. The scene below is _beautiful_ but
its about 80F here and I think I will stay. Keep those
sleet melters working.
--
Richard Knoppow
Los Angeles
WB6KBL
d
ing blocked by a third party spam blocker and as a
result having to re-subscribe to a couple of lists using my
ARRL account so I thought I would check.
Anyway, Happy Hollidays to all and thanks for the
companionship.
--
Richard Knoppow
Los Angeles
WB6KBL
dickb...@ix
Haven't gotten anything for a week, is the list still
alive?
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ned and got a bounce.
So, whatever happened, I am glad the list is back.
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- Original Message -
From: "Richard Knoppow" <1oldle...@ix.netcom.com>
To:
Sent: Saturday, November 30, 2013 7:22 AM
Subject: [Drakelist] Test message
Another test message.
I got a message from Thom La Costa, the owner of this
list, that messages from i
Another test message.
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A test to see if I am resubscribed.
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eaning may increase the holding
friction a bit. Otherwise I agree about using felt washers
under the knob.
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- Original Message -
From: "Bill V"
To: "Richard Knoppow" <1oldle...@ix.netcom.com>;
Sent: Saturday, October 19, 2013 11:22 AM
Subject: Re: [Drakelist] TR-4 AM Mode Receive Distortion...
Hi Richard,
Your facts are undistorted... and I do ha
re getting
distortion on received AM signals but not on SSB? Have you
access to an oscilloscope?
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ouble. Its
always worth poking at the wiring with an insulated stick
when nothing else works. I usually use a wooden chop-stick.
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ad and use a general coverage receiver to see what
is coming out. The load or the transmitter will leak enough
signal to hear it. The receiver does not have to be
anything special as long as you can get an approximate
indication of where the output is.
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Richard Knoppow
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WB6KBL
di
stributed constants instead of
lumped constants. Both act in exactly the same way as an
electrical transmission line or impedance matching network
does.
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Richard Knoppow
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WB6KBL
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f
the small speakers used in these receivers will astonish you
if put into larger, well made, boxes or even just a large
flat baffle.
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is usually at the end of the IF chain, that is
at the detector, so does not prevent the noise from
actuating the AVC and desensitizing the receiver. At one
time ignition noise was a real problem and may still be for
mobile operation, but I never hear it at my house.
--
Richard
uld
change the entire capacitor. While you can use individual
units you can get an exact replacement from
http://www.hayseedhamfest.com/
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Richard Knoppow
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d what you mean, can you give a
more detailed description of what is happening.
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RF coils. Those are removed by squeezing the tabs on the
sides with a pliers and working them off.
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vel but at full
current my memory is that its fairly substantial but I don't
remember exactly how much.
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and a small brush. I've had this happen, don't remember
exactly which tube caused it but even just wiggling the
tubes in their sockets will sometimes fix it. The other
voodoo is working the screws to make sure they make good
chassis contact but I suspect the tubes.
--
Richa
e on the measurement.
Evidently a lot of electronic voltmeters have them. In some
cases a manufacturer will specify the use of such a resistor
in making measurements. I think Collins does this in some
older manuals.
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Richard Knoppow
Los Angeles
WB6KBL
di
absolutely mint out of the box
condx and the one that works faultlessly is a bit scruffy.
73 Max M0GHQ
This sure sounds like a power supply problem. Check the
voltages. If not the supply itself something is pulling one
of the voltages down.
--
Richard Knoppow
Los Angeles
WB6KBL
dickb...@ix.
oltages or part designators.
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pes that to into the stratosphere are common so one need
not worry about building anything.
I will say that for high power amps a grid-dip meter
that can also work as a wavemeter/detector is helpful.
--
Richard Knoppow
Los Angeles
WB6KBL
di
it at the feed-through caps for the tubes. That
is dangerous both because its a shock hazard and because of
the danger of accidental shorting of the supply.
The handbook method is fussy but works.
--
Richard Knoppow
Los Angeles
WB6KBL
dickb..
ough the entire adjustment procedure.
I think Garrey Barrell has a disc for the R4C and it
may have stage gain info, contact him about this. He is
_not_ on this list. www.k4oah.com
--
Richard Knoppow
Los Angeles
WB6KBL
dickb...@ix.netcom.com
__
resistors with mold seams going the long way all seem to go
bad.
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onfirm there is a signal at the side tone jack and
then trace it along the audio chain to see where its getting
lost. Since the position of the function switch (that is AM
or SSB) does not seem to affect the problem its likely after
the switch S-5.
--
Richard Knoppow
Los Angeles
WB6KBL
dickb..
nd adjust the capacitor to get
oscillation.
International Crystal seems to be a good source for
Drake crystals. They know the characteristics. If you
determine the crystals are bad I suggest calling them.
--
Richard Knoppow
Los Angeles
WB6KBL
dickb...@ix.netcom.com
___
o possible
for moisture to cause an arc.
You can check the power supply with it disconnected
from the transmitter by shorting the AC switch pins on the
connector. Unloaded voltages will be higher than indicated
on the schematic. I variable transformer is useful here.
--
Richard Knop
ght load which will give best frequency responce and
minimum distortion. OTOH, the headphone jack is fed from
the same place as the speaker jack and will feed phones of
almost any impedance so its probably not very critical. If
your computer has a "line" input you might try that as well
ith an ohm meter.
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Richard Knoppow
Los Angeles
WB6KBL
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In GOD we trust
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cosmetic purposes but I don't see any sense to that plus the
openings in the chassis from the old caps are convenient for
wiring.
Note that there is a fair amount of ripple on the HV
line especially under load. I also found the voltages given
in the Heathkit instructions were optimistic
ten ground connections are made through
them and they become slightly corroded in the same way as
the contacts on switches do. Working them will clean the
connection and often get rid of pernicious problems.
--
Richard Knoppow
Los Angeles
WB6KBL
dickb...@ix.
thing that has gotten
in-between the plates canned air may also get it out.
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Richard Knoppow
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WB6KBL
dickb...@ix.netcom.com
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for this mic showing the wiring
at:
http://homepage.ntlworld.com/rg4wpw/mc50.pdf
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Richard Knoppow
Los Angeles
WB6KBL
dickb...@ix.netcom.com
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o valley. I can
ask if they are interested in making other than high end
audio tubes.
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Richard Knoppow
Los Angeles
WB6KBL
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to the IRC web client but it seems to work. Its been so
long since I've used IRC that I don't remember any of the
commands so I stayed only a couple of minutes. But, the
thing works and I will try it again:-)
--
Richard Knoppow
Los Angeles
WB6K
e URL it appears you can't access the
current issue. This is an odd way to set up something that
is offered free.
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WB6KBL
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http://mai
ing is way out of
alignment. If the above voodoo doesn't fix it I suggest
going through the alignment procedure.
Its normal for the side band indicator to switch with
the band. Its set up for the most commonly used sideband on
each band.
--
Richard Knoppow
Los Angel
shield is for a 7 pin and the V7 is a 9
pin (wider and
taller). Mike
Shields for V6 and V7 were never supplied. I am not
sure why sockets taking shields were used perhaps because
they do provide some shielding of the base of the tube.
--
Richard Knoppow
Los Angeles
WB6KBL
dickb..
and a fine brush like those sold for cleaning
between your teeth.
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Richard Knoppow
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WB6KBL
dickb...@ix.netcom.com
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VOX pot to accomplish this I
also wonder. I wonder about the untended concequences of
many of the mods for Drake stuff especially those for
"improving" the audio.
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Richard Knoppow
Los Angeles
WB6KBL
dickb...@ix.netcom.com
___
Dr
far fetched but easy enough to do and worth a
try. If cleaning makes a difference but does not cure the
problem a new socket might be in order.
--
Richard Knoppow
Los Angeles
WB6KBL
dickb...@ix.netcom.com
- Original Message -
From: "Randy WB4SPB"
To:
Sent: Thursday, F
away any excess with qtips. Mike.
I use paint pens. They come in several colors and tip
widths. I got mine from a local art supply store. Mine were
made by the same people who make Sharpie marker pens. These
are filled with enamel paint.
--
Richard Knoppow
Los Angeles
WB6KBL
dickb...@ix.
devices. The plate efficiency is partly a matter of the
pulse duration. I think if you want a transmitter primarily
for CW or FSK building one from scratch might be best.
--
Richard Knoppow
Los Angeles
WB6KBL
dickb...@ix.netcom.com
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ew ones can be
had from International Crystal or Bry Carling.
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ement error. The voltages that count are those
measured with the transmitter working.
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- Original Message -
From: "Rick Gunderman"
To: "Richard Knoppow" <1oldle...@ix.netcom.com>
Cc:
Sent: Sunday, January 15, 2012 9:56 AM
Subject: Re: [Drakelist] AC-4 Voltages
Thank you for your response Richard. Using the same meter,
my line voltage
read
the result of operating without a load although
that will raise them somewhat. However, it would not change
the bias voltage.
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ht
an old Electro-Voice 654-A. The amount of difference
surprized me because of the narrowness of the pass band.
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lease AVC. Also, measuring modulation percentage is not as
straight forward as for a conventional transmitter.
If one wants real AM its better to get or build a
dedicated transmitter but Drake makes it possible to
communicate with those who may not have SSB receivers (wh
insulating varnish. One can find it as a generic but Glyptal
is still an active trade name for several types of
insulating varnish, a Google search will find it.
--
Richard Knoppow
Los Angeles
WB6KBL
dickb...@ix.netcom.com
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There is also a Morse Code list where you might get
some help. I have no idea of the value of this thing.
http://mailman.qth.net/mailman/listinfo/morsecode
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Richard Knoppow
Los Angeles
WB6KBL
dickb...@ix.netcom.com
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Dr
uld do it. I've had tubes crack from
overheating but have never had a suck-out.
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required. Note that
older cabinets were painted in whatever the current color
was so that you will find older instruments that originally
came with the dark gray cabinets painted in the almost
violet lighter gray or even blue.
--
Richard Knoppow
Los Angeles
WB6KBL
di
at stuff went to the factory and I
don't know what they did with it).
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tion is IMO a good
sign. Some compensation results in drift that varies in
direction as the temp changes.
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stuffed old cans. They are exactly right. He makes caps
for Drake, Hallicrafters and other classic equipment.
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ant than the wattage. Modern irons have very
little mass so are cooled quickly, for working on old
equipment one needs a high mass iron.
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Richard Knoppow
Los Angeles
WB6KBL
dickb...@ix.netcom.com
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Drakeli
ng a spare
available is a good idea even though they are likely to last
forever. If the TR-4 receiver seems dead and its nothing
else the lamp is worth looking at. If its open or the
contacts are dirty the effect is of no antenna being
connected.
--
Richard Knoppow
Los Angeles
WB
ading. I wonder
where this transmission is actually beamed.
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stuff run hot
anyway, a small fan may help with this.
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ic element. They work the same but the crystal has
higher output.
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aterial available on
the web. Its possible to get a good, practical,
understanding of impedance and its transformation without
getting too deeply into theory but the real theory is pretty
deep stuff. BTW, matching may not be too important in some
instances; its often not for receiving ant
than a new one but the nature of the mounting is
important and modern crystals may not be subject to as much
drift to begin with. I wish I had access to actual numbers
for all this, I am sure the data must exist somewhere.
--
Richard Knoppow
Los Angeles
WB6KBL
dickb..
s stuff to work just like it did when it came out of the
box new. Pretty often it does but I think that's a bit of a
miracle.
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extremely difficult
and manufacturing them a tour-de-force.
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with the idea that they would drift toward the
desired frequency. The drift was expected to be very slow
and the circuit allowed adjustment, but the idea was that
after a long ageing period the drift would stop or at least
become very slow.
--
Richard Knoppow
Los An
with Nicolson was
very extensive but, eventually, both won out and Cady was
recognized as the orginator of the crystal oscillator
--
Richard Knoppow
Los Angeles
WB6KBL
dickb...@ix.netcom.com
- Original Message -
From: "Richard Knoppow" <1oldle...@ix.netcom.com>
To: &quo
ctual oscillator, that is probably
why he was recognized as the inventor.
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BTW, I found a paper on this topic in the Bell
System Technical Journal for sometime in the 1950! I will
have to find it again.
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some care you can re-use the insulating sleeving.
A warning: the spacers for the panels are easy to
loose. I work in a shallow box to hold any small parts that
want to go flying.
--
Richard Knoppow
Los Angeles
WB6KBL
dickb...@ix.netcom.com
_
ly and tile
cleaners seem harder to control. I am mainly worried about
getting too much moisture inside IF cans and similar places.
I suspect you should be careful of investing too much
time and effort in something you want to get rid of
this is in practice.
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Richard Knoppow
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- Original Message -
From: "Jim Shorney"
To: "drakelist"
Sent: Thursday, August 25, 2011 6:36 PM
Subject: Re: [Drakelist] AF output tube in R4A
On Thu, 25 Aug 2011 16:34:03 -0700, Richard Knoppow wrote:
Note: do people on this list prefer top replies
? I got a private e-mail asking me to change to top
posting so I am trying it.
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Richard Knoppow
Los Angeles
WB6KBL
dickb...@ix.netcom.com
- Original Message -
From: "Garey Barrell"
To: "drakelist"
Sent: Thursday, August 25, 2011 2:30 PM
Subject: Re: [Drake
und at it. But, check the voltage at the zener end
of R-64 to see what is happening there.
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meters. While this is silly here
there are engineering applications where such things _do_
need to be calculated.
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Los Angeles
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pinions in this group?
Also on the TR-4 finals and R4B receiver over the power
transformer. The latter can be quite a small fan but makes
all the difference, the transformer goes from being too hot
to touch to cool to the touch.
--
Richard Knoppow
Los Angeles
WB6KBL
dickb...@ix.
ly
and don't know if its even still made.
Beside applying penetrating oil try heating the rusted
parts a bit, that may help the oil to penetrate. Also
tapping on them can help because the vibration can help the
oil to wick into the rusted area.
--
Richard Knoppow
Los An
g.
Dennis AE6C
White noise is what I was refering to. The filter would
slow down the rise and fall times of the jumps but not get
rid of them, not really useful.
--
Richard Knoppow
Los Angeles
WB6KBL
dickb...@ix.netcom.com
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hread if the
Zener was replaced.
If the jumping is intermittant and especially if
temperature dependant I would be very suspicious that there
might be a cracked trace or bad solder joint.
--
Richard Knoppow
Los Angeles
WB6KBL
dickb...@ix.netcom.com
ary of adding
anything. This problem exists because some component has
gone wrong and not because the _design_ is wrong.
Lastly, this is just a dumb machine and its outsmarting
a bunch of fairly smart people, we should be able to beat
it!
--
Richard Knoppow
Los Angeles
WB6KBL
dickb...@i
thing where all
the parts are good but the thing doesn't work.
--
Richard Knoppow
Los Angeles
WB6KBL
dickb...@ix.netcom.com
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ich is not available elsewhere.
See:
--
Richard Knoppow
Los Angeles
WB6KBL
dickb...@ix.netcom.com
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lube, and you're OK.
73
-Jim
I've seen a lot of other stuff with plastic gears that
were lubricated at the factory. I think that neither Nylon
or Delrin is a particularly low friction material. Brass
gears do not need lubrication but nearly all other materials
do.
--
Richard Knoppo
l railroad
stuff.
Collins recommends an aircraft grease for use on the
metal gears in some of its equipment. I got the right grease
as Aeroshell Grease No.7 Other greases should be cleaned
off before applying it as it reacts with some to form a hard
substance. In fact, a co
ohms and a high impedance mice
several hundred to a few thousand ohms.
While it may be a special of some sort it probably
isn't.
--
Richard Knoppow
Los Angeles
WB6KBL
dickb...@ix.netcom.com
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which was a slide switch with
snap-and-remain-in-position, not spring loaded for easy
return. However, the
LOAD shaft spring is strong enough to return the switch.
EUREKA
Congratulations and halilulia!
--
Richard Knoppow
Los Angeles
WB6K
1.5mhz to
28.5mhz.
--
Richard Knoppow
Los Angeles
WB6KBL
dickb...@ix.netcom.com
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