Just noticed that when I PTT on my mic that my Alpha 87A Grid current always
shows a momentary spike of about 70ma. This happens even if I have the
output of my tranceiver set to zero. I rarely see Grid Current higher than
35ma even when driving the Alpha with 50w to full legal output. Is this
something to be concerned about and if so, what's the cause?
73 de K1JOS (Jerry)
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]On
Behalf Of amps-request@contesting.com
Sent: Wednesday, September 12, 2007 11:00 AM
To: amps@contesting.com
Subject: Amps Digest, Vol 57, Issue 21
Send Amps mailing list submissions to
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When replying, please edit your Subject line so it is more specific
than "Re: Contents of Amps digest..."
Today's Topics:
1. SELL: Drake L4B Parts (w2cqm@juno.com)
2. NCL 2000 Information/Hardware (Pat Barthelow)
3. Load Pulling (bumerang boom)
4. Re: NCL 2000 Information/Hardware (Jim Tonne)
5. SB-200/SB-220 meters (Gudguyham@aol.com)
6. Re: Load Pulling (Bill Fuqua)
7. Re: Load Pulling (bumerang boom)
8. Re: Load Pulling (d.cutter@ntlworld.com)
9. Re: Load Pulling (Tom Rauch)
10. Re: Load Pulling (bumerang boom)
----------------------------------------------------------------------
Message: 1
Date: Tue, 11 Sep 2007 16:55:17 GMT
From: "w2cqm@juno.com" <w2cqm@juno.com>
Subject: [Amps] SELL: Drake L4B Parts
To: amps@contesting.com
Message-ID: <20070911.125517.17473.0@webmail10.vgs.untd.com>
Content-Type: text/plain; charset=us-ascii
Offering for sale original Drake L4B Amplifier components. Tested, all like
new and working perfectly.:
A. Drake OEM multi-tap filament xmfr. Dual 110/220VAC primary;5VCT at 30amp,
24VAC, 110VAC secondaries. Test perfectly. $85
B. Pr. original Drake feed-thru filament pressurized cabinet bypass
capacitors .1mfd, 20amp, 600VDC $16pr.
C. Complete AGC/Antenna relay component package. Includes the AGC board
fully wired and removed intact and the difficult to locate front panel
AGC/Relay control. Includes all mounting hardware. $45
D. Pair of Johnson porcelain 3-500 sockets wired in tandem with silvered
buss straps removed from the Drake L4B. No RF burn marks. $30each $50pr.
E.Rear panel female antenna changeover relay socket (no mating plug) $3
F. Drake RF deck rear panel socket with all caps in place. $12
All items plus shipping Ron W2CQM/3
http://swap.qth.com/segamida/617541.jpg
------------------------------
Message: 2
Date: Tue, 11 Sep 2007 22:35:54 -0700
From: "Pat Barthelow" <aa6eg@hotmail.com>
Subject: [Amps] NCL 2000 Information/Hardware
To: amps@contesting.com
Message-ID: <BAY103-F2131E47B2C2EB4A2DF591DFBC20@phx.gbl>
Content-Type: text/plain; format=flowed
Anyone have an old NCL 2000, basket case for parts?
Or, specific Info or the Mfg of the meters used?
Or, anything that can be used to recreate accurately meter face
artwork?
All the Best, 73,
Pat Barthelow aa6eg@hotmail.com
http://www.jamesburgdish.org
Subscribe: http://bambi.net/jamesburg.html
Jamesburg Earth Station Moon Bounce Team
------------------------------
Message: 3
Date: Wed, 12 Sep 2007 03:44:22 -0700 (PDT)
From: bumerang boom <bumerang.boom@yahoo.com>
Subject: [Amps] Load Pulling
To: amps@contesting.com
Message-ID: <99630.94149.qm@web33701.mail.mud.yahoo.com>
Content-Type: text/plain; charset=iso-8859-1
Hello, one and all.
I need to characterize the output an unusual AMP. It
outputs a 20nS 70Square pulse every 500nS.
I would like to measure it's output complex impedance
but
I am not sure if the usual equipment like an antenna
tuner and a SWR meter will indicate correct values.
Can any one help with ideas in the test bed
construction?
Any help will be greatly appreciated.
N2NNU
____________________________________________________________________________
________
Looking for a deal? Find great prices on flights and hotels with Yahoo!
FareChase.
http://farechase.yahoo.com/
------------------------------
Message: 4
Date: Wed, 12 Sep 2007 09:17:03 -0400
From: "Jim Tonne" <tonne@comcast.net>
Subject: Re: [Amps] NCL 2000 Information/Hardware
To: "Pat Barthelow" <aa6eg@hotmail.com>, <amps@contesting.com>
Message-ID: <008201c7f53f$363c1340$2602a8c0@jim177093b3dd9>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Pat Bartholow wrote (in part):
> Or, anything that can be used to recreate accurately meter face
> artwork?
A nice program is here:
http://tonnesoftware.com/meter.html
- Jim WB6BLD
------------------------------
Message: 5
Date: Wed, 12 Sep 2007 09:27:29 EDT
From: Gudguyham@aol.com
Subject: [Amps] SB-200/SB-220 meters
To: amps@contesting.com
Message-ID: <cda.177fb506.34194341@aol.com>
Content-Type: text/plain; charset="US-ASCII"
If anyone has a bad meter for either of the these amps, I would be
interested in buying it for the scale and outer plastic housing. Please
e-mail me
with what you have. Thank You.....73 Lou W1QJ
************************************** See what's new at http://www.aol.com
------------------------------
Message: 6
Date: Wed, 12 Sep 2007 09:33:00 -0400
From: Bill Fuqua <wlfuqu00@uky.edu>
Subject: Re: [Amps] Load Pulling
To: bumerang boom <bumerang.boom@yahoo.com>, "amps@contesting.com"
<amps@contesting.com>
Message-ID: <5.1.1.5.2.20070912092407.03788540@exchange.uky.edu>
Content-Type: text/plain; charset="us-ascii"; format=flowed
20ns x 70 =1400 ns
every 500 ns?
Seems to me that the easiest way would be to
construct a tuner and a 50 ohm dummy load with
a thermometer.
Tune for max dummy load temp. and then measure the impedance of the
tuner-dummy-dummy load.
Change the sign of the j ( imaginary) component and you have it.
At 06:44 AM 9/12/2007 -0400, bumerang boom wrote:
>Hello, one and all.
>I need to characterize the output an unusual AMP. It
>outputs a 20nS 70Square pulse every 500nS.
>I would like to measure it's output complex impedance
>but
>I am not sure if the usual equipment like an antenna
>tuner and a SWR meter will indicate correct values.
>
>Can any one help with ideas in the test bed
>construction?
>Any help will be greatly appreciated.
>
>N2NNU
>
>
>
>___________________________________________________________________________
_________
>Looking for a deal? Find great prices on flights and hotels with Yahoo!
>FareChase.
>http://farechase.yahoo.com/
>_______________________________________________
>Amps mailing list
>Amps@contesting.com
>http://lists.contesting.com/mailman/listinfo/amps
------------------------------
Message: 7
Date: Wed, 12 Sep 2007 07:06:17 -0700 (PDT)
From: bumerang boom <bumerang.boom@yahoo.com>
Subject: Re: [Amps] Load Pulling
To: Bill Fuqua <wlfuqu00@uky.edu>, amps@contesting.com
Message-ID: <376778.12584.qm@web33710.mail.mud.yahoo.com>
Content-Type: text/plain; charset=iso-8859-1
My apologies... I misses the "V" after the 70 so the
output of the amp/generator is a 70V pulse with a
width of 20nS every 480nS. This means that the period
is 500nS and a duty cycle around of 0.6%.
I was afraid you will mention a calorimeter :( It
seems tedious and messy :) But if there are no
alternatives I'll do this to.
Is there any derating formula for a Power/SWR meter
from CW to small duty cycle Pulse? I looked on
internet but I had perhaps the wrong key-words :(
Sincerely,
N2NNU
--- Bill Fuqua <wlfuqu00@uky.edu> wrote:
> 20ns x 70 =1400 ns
> every 500 ns?
>
> Seems to me that the easiest way would be to
> construct a tuner and a 50 ohm dummy load with
> a thermometer.
>
> Tune for max dummy load temp. and then measure the
> impedance of the
> tuner-dummy-dummy load.
> Change the sign of the j ( imaginary) component and
> you have it.
>
>
>
>
>
> At 06:44 AM 9/12/2007 -0400, bumerang boom wrote:
> >Hello, one and all.
> >I need to characterize the output an unusual AMP.
> It
> >outputs a 20nS 70Square pulse every 500nS.
> >I would like to measure it's output complex
> impedance
> >but
> >I am not sure if the usual equipment like an
> antenna
> >tuner and a SWR meter will indicate correct values.
> >
> >Can any one help with ideas in the test bed
> >construction?
> >Any help will be greatly appreciated.
> >
> >N2NNU
> >
> >
> >
>
>___________________________________________________________________________
_________
> >Looking for a deal? Find great prices on flights
> and hotels with Yahoo!
> >FareChase.
> >http://farechase.yahoo.com/
> >_______________________________________________
> >Amps mailing list
> >Amps@contesting.com
> >http://lists.contesting.com/mailman/listinfo/amps
>
>
____________________________________________________________________________
________
Yahoo! oneSearch: Finally, mobile search
that gives answers, not web links.
http://mobile.yahoo.com/mobileweb/onesearch?refer=1ONXIC
------------------------------
Message: 8
Date: Wed, 12 Sep 2007 15:12:01 +0100
From: <d.cutter@ntlworld.com>
Subject: Re: [Amps] Load Pulling
To: Bill Fuqua <wlfuqu00@uky.edu>, bumerang boom
<bumerang.boom@yahoo.com>, "amps@contesting.com"
<amps@contesting.com>
Message-ID:
<20070912141157.EMET17393.aamtaout02-winn.ispmail.ntl.com@smtp.ntlworld.com
>
Content-Type: text/plain; charset=ISO-8859-1
Used to do something like this in the 70's at microwave.
David
G3UNA
>
> From: Bill Fuqua <wlfuqu00@uky.edu>
> Date: 2007/09/12 Wed PM 02:33:00 BST
> To: bumerang boom <bumerang.boom@yahoo.com>,
> "amps@contesting.com" <amps@contesting.com>
> Subject: Re: [Amps] Load Pulling
>
> 20ns x 70 =1400 ns
> every 500 ns?
>
> Seems to me that the easiest way would be to
> construct a tuner and a 50 ohm dummy load with
> a thermometer.
>
> Tune for max dummy load temp. and then measure the impedance of the
> tuner-dummy-dummy load.
> Change the sign of the j ( imaginary) component and you have it.
>
>
>
>
>
> At 06:44 AM 9/12/2007 -0400, bumerang boom wrote:
> >Hello, one and all.
> >I need to characterize the output an unusual AMP. It
> >outputs a 20nS 70Square pulse every 500nS.
> >I would like to measure it's output complex impedance
> >but
> >I am not sure if the usual equipment like an antenna
> >tuner and a SWR meter will indicate correct values.
> >
> >Can any one help with ideas in the test bed
> >construction?
> >Any help will be greatly appreciated.
> >
> >N2NNU
> >
> >
> >
>
>___________________________________________________________________________
_________
> >Looking for a deal? Find great prices on flights and hotels with Yahoo!
> >FareChase.
> >http://farechase.yahoo.com/
> >_______________________________________________
> >Amps mailing list
> >Amps@contesting.com
> >http://lists.contesting.com/mailman/listinfo/amps
>
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
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------------------------------
Message: 9
Date: Wed, 12 Sep 2007 10:26:13 -0400
From: "Tom Rauch" <w8ji@contesting.com>
Subject: Re: [Amps] Load Pulling
To: "bumerang boom" <bumerang.boom@yahoo.com>, <amps@contesting.com>
Message-ID: <010f01c7f548$e4b9c9e0$640fa8c0@radioroom>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
> My apologies... I misses the "V" after the 70 so the
> output of the amp/generator is a 70V pulse with a
> width of 20nS every 480nS. This means that the period
> is 500nS and a duty cycle around of 0.6%.
Good luck on adjusting things while watching a thermometer.
I can't imagine doing that.
It would be far simpler and more accurate with a pulse to
build a detector. You are not trying to measure average
power, you are trying to measure maximum energy transfer.
There is a big difference.
If you match for maximum peak voltage across the load you
have the optimum loadline for the source.
The problem is you don't have RF or at least I didn't see
where you say anything about RF. You have a "50 kHz
fundamental pulse" every 480 nS. No way to tune that with a
tuner. Or is that a .00002 second burst of RF at some
frequency? Is it a very square waveform with lots of odd
harmonics??
73 Tom
------------------------------
Message: 10
Date: Wed, 12 Sep 2007 07:59:12 -0700 (PDT)
From: bumerang boom <bumerang.boom@yahoo.com>
Subject: Re: [Amps] Load Pulling
To: Tom Rauch <w8ji@contesting.com>, amps@contesting.com
Message-ID: <605139.63825.qm@web33705.mail.mud.yahoo.com>
Content-Type: text/plain; charset=iso-8859-1
Thanks Tom for your reply. To my reconing the output
is a carrier of 2MHz pulses (500nS period) with a very
low duty cycle (20nS). The pulse, at least
theoretically, carries a lot of harmonics extending up
to 30MHz.
Perhaps an antenna tuner, a 50 OHM dummy load, a
current metter for the amp suply, and an osciloscope
to watch the magnitude of the output pulse could
provide a clue where the output impedance lies, but I
am not sure about the acuracy of such a measurement
....
N2NNU
--- Tom Rauch <w8ji@contesting.com> wrote:
>
> > My apologies... I misses the "V" after the 70 so
> the
> > output of the amp/generator is a 70V pulse with a
> > width of 20nS every 480nS. This means that the
> period
> > is 500nS and a duty cycle around of 0.6%.
>
> Good luck on adjusting things while watching a
> thermometer.
> I can't imagine doing that.
> It would be far simpler and more accurate with a
> pulse to
> build a detector. You are not trying to measure
> average
> power, you are trying to measure maximum energy
> transfer.
> There is a big difference.
>
> If you match for maximum peak voltage across the
> load you
> have the optimum loadline for the source.
>
> The problem is you don't have RF or at least I
> didn't see
> where you say anything about RF. You have a "50 kHz
> fundamental pulse" every 480 nS. No way to tune
> that with a
> tuner. Or is that a .00002 second burst of RF at
> some
> frequency? Is it a very square waveform with lots of
> odd
> harmonics??
>
> 73 Tom
>
>
>
>
____________________________________________________________________________
________
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for today's economy) at Yahoo! Games.
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------------------------------
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End of Amps Digest, Vol 57, Issue 21
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