--
Message: 1
Date: Thu, 27 May 2010 12:36:24 -0400 (EDT)
From: "Larry Szendrei"
Subject: Re: [AMRadio] Heathkit DX-60 grid current drops
To: "Discussion of AM Radio in the Amateur Service"
Message-ID:
<61478.24.97.2
Jim,
If you use the Mozilla Firefox browser, there is a free FTP plug in for
Firefox. I haven't tried it for Bama, but I bet it will work once you sort out
the login mess I always fight trying to get an FTP program to work.
73,
Jim
WD5JKO
Message: 2
Date: Tue, 7 Jul 2009 10:49:28 -0500
Here is part of a good thread on the rec.audio.tubes list:
Andre Jute wrote:
>
> On May 28, 4:20 am, Jon Yaeger wrote:
> > My recent post about the phasing of OPTs came up because I'm configuring
> > a
> > tube amp based around the iron from a Sansui 1000A, -- the OPTs are
> > reputedly made by
Message: 4
Date: Mon, 18 May 2009 19:16:10 -0400
From: John Coleman
Subject: Re: [AMRadio] push pull output XFMRs and neg feedback
To: Discussion of AM Radio in the Amateur Service
Jim
I had a chance to add the 3300 ohm resistor and the .001uf capacitor to
the circuit at the grid of the
>
> Message: 3
> Date: Mon, 18 May 2009 10:42:01 -0400
> From: John Coleman
> Subject: Re: [AMRadio] push pull output XFMRs and neg feedback
>
>
> Thanks Jim
>I'll give that a try before switching the XFMRs out. I guess what
> your saying is that the slight tolerance differences of com
John,
I had similar issues with a stereo 6L6 amp I built many years ago. The
oscillation would come and go, and it eventually killed the tweeters on my old
Utah 12" 3 ways. The following article describes the problem well in a similar
amplifier:
http://www.pmillett.com/file_downloads/chic
Hi All,
I posted my latest changes to my Gonset G-50 on AM Fone. See link below. The
final post is what I am referring to. You might get a laugh or two on some of
the earlier posts. I surely did. Any predictions for a 6 meter opening this
spring and early summer?
http://amfone.net/Amforum/i
No discussion concerning the Theremin should exclude the contributions of the
late Fred Nachbaur:
http://www.dogstar.dantimax.dk/index.htm
Fred would have made a great AM Ham. It's unfortunate that he was the victim of
cancer in 2004 soon after he completed the Dogzilla Guitar Amp (six 807's P
Hi guys,
I have been following the work of Patrick Turner at Turner Audio for a
long time. His web site has been recently updated with a ton of power amps,
preamps, power supply design, and transformer design.
Many of these circuits could be adapted to AM modulator service. Here is the
U
Bill,
I surely do not endorse this idea, but a well placed bullet might change the
'priority' of the problem, and might even take care of it completely!
Regards,
Jim
WD5JKO
__
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AMRadio mailing l
I once had the task to find a suitable HV fuse for use on a 400 watt solid
state lighting ballast that needed to isolate a bad ballast while holding off
360 volts DC. The ballast used a little over 1 ampere when working, and when a
fault ocurred (shorted transistors) the current could bring dow
>Jim Tonne
>Mon, 17 Mar 2008 15:46:29 -0700
>To the techies on this list. I am designing a power
>supply using LTspice and need some numbers.
>Just had a thought that you might be able to
>answer a question I have. Do you know about
>what the various num
>Sat, 22 Mar 2008 16:53:18 -0700
>steveve2swc
>Hi ALL:
>Looking for a Heathkit SB200, anyone got one for sale? Hopefully in the not
>too distant reaches beyond Montreal or NY/Maine/Vermont?
>Steve VE2SWC
Reply by Jim, WD5JKO:
Steve, Good luck with y
-Original Message-
From: Joe Crawford
I knew a guy who used a 30 amp variac to feed a 5 volt, 30 amp filament
transformer on his quad driven element.Worked real good to melt the ice.
Joe W4AAB
Joe,
This is a great idea but the variac can be much
I intercepted this from another forum. rec.audio.tubes
From Sal Brisindi <[EMAIL PROTECTED]>
You might remember about 2 months ago about I wrote here about 4 7199
lifetime Radio Shack tubes I have that were bad, pretty much zero
emissions. There were many responses here whether Radio Sh
Don,
It seems that we have defined PEP power pretty well:
>"Well, PEP is defined as the AVERAGE power over at least one RF cycle at
> the most powerful point of the envelope."
Now, since we do not speak with sine waves, the average "power point of the
envelope" is going to be less than 0.6
Reply by Jim, WD5JKO:
John, and Group,
Your PEP definition agrees with references from other sources. My math
is a little weak, but doesn't this suggest that the 375 watt carrier
limit we arbitrarily impose on ourselves is a low ball value, and with
the definition below can't we run more carrier
resend after my first try bounced...
Hi all,
I have been playing with "Huff and Puff VFO" circuitry for some time
now, and more recently I have purchased a PIC based commercial
product from Cumbria design in England. I purchased an inexpensive kit that
transforms my Lakeshore Band Hopper V
>Sun, 09 Dec 2007 11:16:01 -0800Barrie Smith
>I've been thinking . . . again . . . about a modulator for the push-pull
>VT-127A rig.
>I have all the parts from the KW modulator I used with the push-pull 450TH rig
>I built many years ago, so I could rebuild it.
>I don't
>Fri, 14 Dec 2007 13:14:33 -0800
This seems to fall thru the cracks of what I can find via a Google search.
It is a Poly >Pedance type and looks to be around 300W or so.
>Looking for power ratings as well as the tap info.
>Carl
>KM1H
Reply by Jim WD5JKO
Carl, The foll
Hi All, I was refereed to a website that is full of BA gear for sale. They call
themselves "Nationwide Radio & Equipment sales'. I have never seen so much
collector quality gear in one place before. The section on National receivers
is incredible. Along the way there are a lot of D-104's and ev
Bill, KB3DKS/1 wrote:
Message: 4
Date: Tue, 11 Dec 2007 01:00:48 -0500
From: [EMAIL PROTECTED]
Subject: [AMRadio] Transformer Lead Dress
To: amradio@mailman.qth.net
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset=iso-8859-1
Hello,
I just stripped out a basket case VK II transm
e had much luck
with the cheaper import 6CA7 tubes such those sold by
Antique Radio Supply under the brand names of JJ
Electronics and Valve Art ???
Thanks for reading. 73, John, K5PGW
Reply by Jim Candela, WD5JKO:
John, I h
tubes. Now to order some!! Has anyone had much luck
with the cheaper import 6CA7 tubes such those sold by
Antique Radio Supply under the brand names of JJ
Electronics and Valve Art ???
Thanks for reading. 73, John, K5PGW
Reply by Jim Candela, WD5JKO:
John, I have one of my QRO Central elect
Hi all,
I ran into the following info from another source (yahoo ham_amplifiers). It
looks like the Chinese 572B manufacturing may have already ended. That leaves
the Svetlana version. see info below.
73,
Jim
JKO
pentalab wrote:
> Gents.. this from AMPS. It appears that Chinese 572-B'
- Original Message
From: jeremy-ca <[EMAIL PROTECTED]>
How did you handle the 8877 conversion as far as mounting and cooling?
The
DTR-2000 had the tube horizontal and blowing all the heat right on the
tank
circuit. That caused a bit of tuning drift as the fixed caps for 80/160
wer
-Original Message-
From: [EMAIL PROTECTED] [mailto:amradio-
Glad to hear someone is still flogging those old CE's. I was always
partial
to phasing rigs and would love to find a 100V again.
Carl
KM1H
Reply by Jim, WD5JKO:
Carl, Yes I have been flogging the 20a's for about 5 years now.
- Original Message
From: Ellen Rugowski <[EMAIL PROTECTED]>
To: Discussion of AM Radio in the Amateur Service
Sent: Saturday, November 10, 2007 5:10:47 PM
Subject: Re: [AMRadio] 6U8 Subststute?
H,
Thanks for the info Jim. Is it a direct substitute for the 6U8?
Actually
the rig I
- Original Message
From: jeremy-ca <[EMAIL PROTECTED]>
If the 20A is running them too hot then I'd check out the circuit for
something causing excessive current drain. I used a 20A decades ago and
never had that problem.
Carl
KM1H
Reply by Jim WD5JKO:
Carl decades ago the line
- Original Message
From: Ellen Rugowski <[EMAIL PROTECTED]>
Nope, not yet Steve. Fred, KC1XF, is sending me a 6EA8 in the mail
(that's
just gathering dust for him), and it hasn't arrived yet. It's a direct
substitute for the 6U8, and others who voiced the same opinion as you -
that
Original Message
From: Rick Brashear <[EMAIL PROTECTED]>
Does anyone have an abundance of .47 or .5 tubular capacitors? Not
disc. I
need several 200 vdc and several 450 vdc for a project I am soon to be
working on. Orange Drop or similar would be great. Cash paid.
Thanks,
Rick/K5IAR
Bill, KB3DKS Writes:
Hello,
Antenna performance is not the issue. The coax fed dipole
is resonant at the 75 mtr AM area. Some RF in the shack is inevitable
with the dipole about 20ft over my head. Not an issue.
What I am concerned with is the advisability of seperating the house
earth from th
Bill,
What bands do you wish to operate?
That 16 feet ground wire is close to a quarter wave long on 20 meters.
So 20m operation may have some RF in the shack issues depending on your
antenna choice (balanced feed or single wire feed). For those
transmitting from the 2nd floor and above, it m
- Original Message
From: John <[EMAIL PROTECTED]>
Subject: Re: [AMRadio] Receive Preamp question
I did notice the Emeco PT-3. It seemed like it would
do good on 20 and up like I need. I would love to be
able to put together a good preamp. Is there a kit or
a place to find info on a goo
- Original Message
From: John <[EMAIL PROTECTED]>
Does anyone have a good recommendation for a preamp to
help my radio receive better. Thanks for any
suggestions.
John W5HG
John,
This is a very broad topic. In general you need enough gain to bring the
ambient band noise (not
Hi All,
I just noticed that Amazon has tubes and sockets for sale. Just go to
www.amazon.com and search for "tubes" or "tube sockets". There are over 200
items for sale. These are mostly HI-FI power tubes common and 12A_7 preamp
tubes, but some exceptions such as 6u8, 6C4, 6AK6, 6H6, 6K7,
Rick,
Look into the EF86 and the need to rewire the socket.
http://lists.radiolists.net/pipermail/broadcast/2005-February/002278.html
Jim
- Original Message
From: Rick Brashear <[EMAIL PROTECTED]>
To: Discussion of AM Radio in the Amateur Service
Sent: Saturday, October 27, 2007 1:3
Bob, The 812 is an input transformer of high quality. I found one on Ebay, see
below. Bill is looking for an interstage transformer to go between the driver
tube and the P-P grids of the 6146's. I suppose you could turn it around and
parallel the secondaries as a single primary using the 812 as
Hi Group,
I am tuned up on 7290 right now with my Gonset G-76 + 8877 amplifier. This
combo is putting out a 350 watt carrier. I wonder of anyone can get on? I'll be
listening from Round Rock Texas.
Jim
WD5JKO
__
Our Main Website:
y is against
>list regs but I just had to comment Glen,I was wondering if you
>could describe to the group how AM might take part in military
>communications in Iraq. Also, is there any Ham Radio operating being
>allowed? Regards, Jim Candela WD5JKO
>_
__
ht take part in
military communications in Iraq.
Also, is there any Ham Radio operating being allowed?
Regards,
Jim Candela
WD5JKO
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AMRadio mailing list
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Mike,
The broadband noise needs to be your first effort to remedy. Why go through
all kinds of stuff with your equipment when there is a bug zapper across the
street that constantly is sizzling away? Find the source and see if you can
eliminate it. I once had total noise ( S9 + 20 or higher
Bill,
Also consider 6050 for use on 17m at 18150. I know this works on the Viking I
when the bandswitch is on 20 or 15m (don't recall which). The Viking I or II
has the advantage of a continuously tuned output pi-net whereas the Valiant
likes to stay closer to ham bands of that era.
17m has be
Everything I've read in this thread is correct but we are leaving a
couple of points out.
The first is the voltage rating of the resistor may be different between
a 39K 2W device and four 39K's connected in series parallel.
The other point is that each resistor has a series inductance and a
John,
Thanks for listening and the relay. My noise level is S5 (impulse) and I
could not pull the KF9 out of that static. I should have tried this a few hours
earlier when the skip was shorter.
Thanks,
Jim
JKO
- Original Message
From: "[EMAIL PROTECTED]" <[EMAIL PROTECTED]>
To: amr
Hi All,
I just tried my G-76 + 8877 combo and it works out to 400 watts carrier on
7290. I will be calling CQ in 10 minutes. I'd appreciate a few reports or
better yet a QSO.
See you!
Jim WD5JKO
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Our Main Website: http://www.amfon
- Original Message
From: Jim Wilhite <[EMAIL PROTECTED]>
Subject: [AMRadio] Conditioner
I am looking for someone who sells Neoprene rubber
conditioner.
Years back turntables had Neoprene rubber around the table
with a Neoprene capstan that drove the turntable. Someone
manufactured a
>
> The 814 has a 5-pin socket, the same as the 807. It is a pentode,
with a
> separate pin connection for the suppressor grid. For data on this
tube,
go
> to http://datasheets.electron-tube.net/sheets/049/8/814.pdf
>
> I plan to attend the Huntsville, AL hamfest this coming Saturday, 18
AU.
> Ho
>That is TOO Funny Jim...I wonder if he will sell any???
>Bob W1PE
Bob, The mugs, shirts, clock, shorts, and the thong are all the brainchild of
Joe Tyburczy W1GFH. Bill is aware of this and doesn't get any compensation
other than being immortalized by this stuff. I was in a QSO with Bill
Here is a must buy:
http://www.cafepress.com/amradio3.120828636
;->
Jim
JKO
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- Original Message
From: Jim Wilhite <[EMAIL PROTECTED]>
I have always heard from all my
old(er) elmers that it takes two things to work on 160. 1.
Power 2 a vertical antenna.
Reply by Jim, JKO:
back around Christmas of 1975, 160 meters was very quiet in Michigan. I ran a
Lear
.
Jim
JKO
- Original Message
From: ne1s <[EMAIL PROTECTED]>
To: Discussion of AM Radio in the Amateur Service
Sent: Thursday, July 26, 2007 11:55:34 AM
Subject: [AMRadio] Re: age pole - JKO
Jim Candela writes:
> Later
> upgraded to a Lear T30 (6L6 mod by P-P 6l6) for 160m, a Viking I
Hi all,
Back in the early 1980's, Ozona Bob used a Globe King 400 on 10m into
two 10 element Sterba curtains phased to be unidirectional. He called it
the 20 element Sterba. He had two of these, one headed towards Main, and
the other towards Washington State. Bob had a lot of wire up in the air
> I still think it might be nice to have a poll for how long they have
> been a ham, and one for how long they have been into AM. Putting the
> results of all three together would give some good info.
> 73
> Brian
Okay, Brian, here's my data:
b. 1956
novice in 1972 WN8PEP -- Lanse Cruise am
Hi All,
I just purchased the "Kill-A-Watt" meter from an Ebay seller. These
are neat because they plug into a 120v outlet, and you plug whatever you
want into this gadget. It will display:
Volts
Amps
Watts
VA
Power Factor
Frequency
Time
KWH
I paid less than $20.00 for mine..
This device loo
Paul,
Lots of BA AM rigs will accommodate a 6050 crystal and tune up just fine on
18.150 when the band selected is either 20m or 15m. Maybe Brian Carling has
some of these crystals?
Jim
JKO
- Original Message
From: VJB <[EMAIL PROTECTED]>
To: amradio@mailman.qth.net
Sent: Wednesday,
What does a melted down mod transformer have to do with the subject of this
email thread?
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Part
> I hear nothing, nothing of the SSB bunch. Has something
> happened of which I am ignorant?
I think they are hiding in the bushes waiting for AM activity to return from
dormancy. Where is the AM these days on 80m?
On another note, some months ago I was on 3880 LSB at legal limit while the
'
I am using a similar socket for my 8877 that originally was used for a 4D32
- Original Message
From: Barrie Smith <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]; Discussion of AM Radio in the Amateur Service
Sent: Monday, April 16, 2007 9:32:24 PM
Subject: Re: [AMRadio] Tube socket info
Phil,
The 32V series is basically a 100 watt carrier, and 400w PEP transmitter at
100% modulation. Since the legal limit is 1500w PEP, you need an amplifier that
has about 6 DB of gain, to say ~ 375 watts carrier, and ~ 1500w PEP output with
100w carrier and 400w pep input. To my knowledge,
Bob,
I tried those 4-65's because I had them at the time. I got the B+ up by
making the same power supply filter capacitor input instead of choke input. The
power tranny protested by getting hot quickly, so this approach was not for
'old buzzard transmissions'. I switched out the 809's for
Geoff,
I used a pair of 4-65's in a Globe Champion 350 conversion from AX9909's.
This was kind of tricky to do, but since I had the tubes, and the sockets were
the same, i gave it a try.
Some recollections from that conversion:
The 4-65 is a Higher voltage, and lower current tube. In class
Actually, you can toss the 9v battery into a fish bowel filled with Guppies.
The electric field extends away from the terminals in a cardioid pattern
forming a partial sphere about the size of a large marble. Any fish that swims
into the field goes into a severe muscular contraction, and cardiac
Off topic? Heck no, that second link is the T/R relay at ARS W5MOR!
- Original Message
From: A.R.S. - W5AMI <[EMAIL PROTECTED]>
To: Discussion of AM Radio in the Amateur Service
Sent: Sunday, March 25, 2007 11:29:08 AM
Subject: [AMRadio] Sort of off topic, but real awesome
Kent/KA5MIR
>From Bow, W5RFR
Subject: RE: [AMRadio] New Guy to AM
>Thanks Jim.
>How come I couldn't find that PDF on the AM Window site? I must not have
>the secret decoder ring yet! LOL
>I would love to try a QSO on AM.
>7PM is a bit to early for my to play Radio on a Friday night! I am a full
>time coll
718 will do much with it's
30-40 watts of AM.
My current tube stash consists of:
2- 815
2- 807W
3- 12SK7
1- 12A6
1- KT88
2- 6DQ6
3- 6L6
3- 6K6
1- EL34
1- 6V6
and several dual triode Preamp tubes...
Is there any hope? LOL
Bow
W5EFR
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[E
Bow,
Welcome to the group! I hope this group provides you with knowledge and
camaraderie from a bunch of fine folks who have a passion for AM.
So where do you live? Do you work 75 meters?
I don't have any experience with the 815, but I have heard that this is one
of those tubes that suffers fr
Here is another source I have used with good success:
http://www.mgs4u.com/RF-Microwave/doorknob-capacitors.htm
--
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7:19 PM
__
-Original Message-
From: D. Chester, K4KYV
The tolerable level of SWR depends on the feedline used. With ordinary
coax, I would try to avoid anything over 3:1. The problem caused by high
SWR is dielectric loss, plus the possibility of exceeding the rf voltage
reading at high voltage p
-Original Message-
FromBrett gazdzinski
Sent: Tuesday, February 27, 2007 7:28 PM
I am looking for an IC chip to fix my swan wm-3000, I
replaced the diodes with 1n34a and it works fine on rms,
but the pep reading is still dead.
All the other parts check fine, so I need to get a
small 8 pi
--- Jim Candela <[EMAIL PROTECTED]> wrote:
>
> Ed, Try these "Piss Weak" circuits:
>
> http://www.amwindow.org/tech/htm/pw.htm
>
> Jim
> JKO
>
>
-Original Message-
From: [EMAIL PROTECTED]
On Behalf Of Joe Romero
Jim I like this series m
Ed, Try these "Piss Weak" circuits:
http://www.amwindow.org/tech/htm/pw.htm
Jim
JKO
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Steve, I'm sure your getting frustrated. Hang in there since the solution
is close now. When it is all over and we all look back on it, it needs to make
sense. Now onto the issue as I see it.
I brought up the need for a AC compensated 1000x HV scope probe early in this
thread. Nobody until
Steve,
In cases like this I like to pull out my 1000X HV AC compensated probe.
There is a suitable probe on Ebay right now similar to mine:
Ebay, Item number: 320084300029. Mine is good for 15 kv whereas this one is
good for 7 kv.
A probe like this will allow you to use your scope and safely
-Original Message-
From:D. Chester
To: amradio@mailman.qth.net
Subject: [AMRadio] Re: Gates BC1-T operational again
What I did to make the BC1-T operational on CW would apply to many other
broadcast transmitters.
Don k4kyv
Hey Don,
This is a great story, and a labor of love. Thank
Hey guys check out this item, and then look at what this buyer has been
purchasing:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ih=001&sspagename=STRK%3AMEWA%
3AIT&viewitem=&item=110089728939&rd=1&rd=1
He has big bucks, no sense, and if I can hook up with hem, I'm rich!!
Jim
JKO
--
No vi
Yep, I was the Texas State director!! I still got my certificate too!
Jim
JKO
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of [EMAIL PROTECTED]
Sent: Monday, February 12, 2007 6:39 PM
To: amradio@mailman.qth.net
Subject: Re: [AMRadio] SPAM - (Was: K5SWK)
Hi All,
I found a circuit posted on the Yahoo Group, "RF AMPLIFIERS" in the files
section. This is a PEP modification done by Chuck Hawley, KE9UW. His circuit
has a good description, and looks relatively simple to build into several
popular watt-meters including the Byrd 43, and maybe even my
>From John E. Coleman (ARS WA5BXO):
I have found it to be very important to make measurements while in
operation. Except that RF will mess up the meter readings. This is why I
said to ground the grid directly and then kick the rig to XMIT and make the
measurements then. Checking the plate v
-
Brett gazdzinski wrote:
> I got a wavetech meterman, really cheap meter, but
> it measures inductance from micro henrys, to henrys,
> Pico farads to farads, frequency to 20 Mhz,
> volts, ohms, current, etc.
>
Brett,
I got one of these years ago at my last job. It was in the office station
- Original Message
From: Jay Rusgrove <[EMAIL PROTECTED]>
They can be easily checked if you have a DVM that reads ac amperes. Put the DVM
and the rf ammeter
in series with an appropriate sized load (several light bulbs) and plug it in
to 120 VAC.
Jay
Reply from Jim, WDJKO:
JAY,
Don,
I have a good dummy load, and multiple watt meters, and RF ammeter (0-7
amps), and a decent oscilloscope with a good 10x probe. Using the scope and
formula:
Watts = [E^2/2R] where E is the peak AC value I agree with both watt meters
within +/- 5%. The RF ammeter is mounted in a metal b
>From A.R.S. - W5AMI
Sent: Sunday, January 07, 2007 11:38 AM
I'm looking for some ideas on a negative feedback circuit for my
"Bartellsville KW" transmitter, as the one I installed does not seem
to reduce distortion from the 7581A drivers to my liking.
Brian / w5ami
Reply from Jim, WD5JKO,
-Geoff/W5OMR said:
hey, Jim... I scrambled hard and fast, trying to get the Viking II
connected to an antenna when I heard you testing earlier... and it
couldn't have been a full 3 mins later, and I was calling you... as did
someone else, but you were no where to be heard. BJ/WB5PKD heard me,
t
Bob,
Here is what you need from Ohmite:
http://www.ohmite.com/catalog/pdf/210_series.pdf
Mouser carries the line, but they are not stocked at 40K 175W, and minimum
order is 5 at $25.48 each. Ouch!! maybe contact Ohmite for a list of
distributors. Never hurts to ask for a sample.
Mounting hardwar
Rick,
Mouser has some .01 uf 500v caramic capacitors with Y5P temp code (not
too bad) for 22 cents each (qty 1-199). I would stay away from Z5U and Z5V
temp codes because the capacitance is all over the place (+30 -80% for Z5V)
whereas the Y5P is +/- 10%.
Jim
Price info:
http://www.mouser.c
Hmmm,
Maybe $45.00 is a bargain if these are NOS, NIB, Amperex, Bugle Boy, 12AX7's
Recent Ebay Auction:
Vacuum Tube, Amperex, Bugle Boy, 12AX7, Holland, 17mm
Item number:
18
Rick,
I found the following sight that is pretty comprehensive, and it does not
treat Mylar film capacitors too kindly.
http://www.physicsenterprises.andrews.edu/diy_archive/references/capacitors.html
Regards,
Jim
JKO
- Original Message
From: Rick Brashear <[EMAIL PROTECTED]>
To: AM
>14 12AX7 $45 ea
Is this a typo?
Jim
JKO
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Post: mailto:AMRadio@mailman.
Geoff,
500 watt capable but 1200w PEP is as high as it goesso I usually run 250
watts out (carrier).
Had relatives over last night, never turned on the receiver.. ;_(
My loss,
Jim
JKO
- Original Message
From: Geoff/W5OMR <[EMAIL PROTECTED]>
To: Discussion of AM Radio in the Amat
Jack,
I have never owned a S38B, but I did own a S40B and used it as a Novice on
80/40/15 meters CW. It was pretty terrible actually for CW, but a good 'first'
receiver. On AM it was decent in many respects like you mention with your S38B.
You did well installing the polarized line cord,
Hi Group,
The link below covers how different capacitors used as audio coupling
condensers can 'colorize' or distort the audio signal. At the bottom of the
page is verbage describing how the test was run. I found this very
interesting.
http://members.aol.com/sbench102/caps.html
Regards,
Jim
JK
Rick,
I am guessing that you will be fine going ahead with ceramics since most of
the SP-600 circuitry won't care. That said, there are differences between
capacitor types, and within the ceramic family you have Z5U, Z5V, X7R, COG
(NPO), and maybe some others. I listed those from worst to
Jason,
You can connect directly to the deflection plates for the audio as you
describe. Most modern (1970's and later Tektronix and others) analog scopes
have a setting called X:Y when the horizontal sweep knob is at max CCW. In
this case Channel A is for the X axis and Channel B is for the Y
as the ignition system of
a vehicle ...and DC powered relay kickback.
Kent/KA5MIR
On Saturday 23 December 2006 20:12, Jim Candela wrote:
> Peter,
>
> I am wondering how electric fence chargers work. I once heard that
> they pulse the HV on and off. I assume you grounded the coax shie
Peter,
I am wondering how electric fence chargers work. I once heard that they
pulse the HV on and off. I assume you grounded the coax shield near your home
or barn yet the coax was still hot anywhere it touched the earth?? I don't see
how that could be unless the coax braid was floating,
Brian, W5ami said:
>I don't see using coax. There should be no RF getting back into the
>HV anyway, if there is, you have other problems to address.
>Far as shorts, a HV short is going to find ground regardless if it's
>the shield of the coax or some other very close ground. Maybe I'm
>missing
Jack,
The HV wire type needs to be sorted by the application. What I use inside a
RF deck or Modulator deck would be different than external wiring between say a
floor mounted power supply and a RF deck.
Within a chassis, I would rather use air insulation, and ceramic standoff
tie point
- Original Message
From: Jack Schmidling <[EMAIL PROTECTED]>
Did some more "research" on that issue and it's a cute idea but as we
discussed, the xformer has a WV of 1500 (whatever that means) and it
would be limited to half the current, i.e. 250 ma.
Reply from Jim, WD5JKO,
Jack, I
Hi all,
I'm watching this exchange, and I keep asking myself the question, WHY? ;-)
Lets tie together multiple threads here, the RF amp, Loop antennas, and high
power tuner. You could take that 450TL push pull rig, with variable link
coupling, and match to 450 ohm open wire feeders to a loop
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