None as long as you have added a grid current meter position (mandatory) and
overcurrent trip (highly recommended). I modified mine and several others
decades ago but now there are kits available.
If not already done the original electrolytics are well past their expected
life and excessive leakage current plus a higher average Ip on CW hastens
transformer failure.
Carl
KM1H
----- Original Message -----
From: "Alberto Pincay -St-" <apincay@gye.satnet.net>
To: <amps@contesting.com>
Sent: Wednesday, January 30, 2013 10:39 PM
Subject: Re: [Amps] Amps Digest, Vol 121, Issue 27
Dear all,
What are the possible downside of using dtr2000l amp in ssb mode while
running cw?
Thanks in advance
Alberto, HC2AQ
-----Mensaje original-----
De: Amps [mailto:amps-bounces@contesting.com] En nombre de
amps-request@contesting.com
Enviado el: sábado, 26 de enero de 2013 12:00
Para: amps@contesting.com
Asunto: Amps Digest, Vol 121, Issue 27
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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. Re: 500 uh plate choke (Bill Turner)
2. Henry current plate meter (Douglas Johnson)
3. Re: 500 uh plate choke (Rob Atkinson)
4. Re: Ameritron AL-1500 inquiry (Jeff Blaine)
5. Re: Ameritron AL-1500 inquiry (k7fm)
6. Re: Ameritron AL-1500 inquiry (Larry Benko)
7. Re: 500 uh plate choke (Carl)
----------------------------------------------------------------------
Message: 1
Date: Fri, 25 Jan 2013 04:43:38 -0800
From: Bill Turner <dezrat1242@yahoo.com>
To: Amps <amps@contesting.com>
Subject: Re: [Amps] 500 uh plate choke
Message-ID: <q3v4g8tql8ebqf22o6ven9eu8t9i0shtsd@4ax.com>
Content-Type: text/plain; charset=ISO-8859-1
ORIGINAL MESSAGE:
On Fri, 25 Jan 2013 03:32:34 -0800, VE7RF wrote:
My theory is all you are really doing is parallel resonating the plate
choke, since it?s directly in parallel with the tune cap.
REPLY:
That's correct, but remember... A parallel resonant circuit has circulating
current inside it. As you drop the inductance of the choke the circulating
current increases and if you drop it too far you run the risk of burning up
the choke, especially when it's wound with small diameter wire. Everything
is a compromise. No free lunch.
Just something to keep in mind.
Bill, W6WRT
------------------------------
Message: 2
Date: Fri, 25 Jan 2013 06:58:53 -0800 (PST)
From: Douglas Johnson <w9iix1@yahoo.com>
To: "amps@contesting.com" <amps@contesting.com>
Subject: [Amps] Henry current plate meter
Message-ID:
<1359125933.28976.YahooMailNeo@web120504.mail.ne1.yahoo.com>
Content-Type: text/plain; charset=iso-8859-1
Had a high voltage short in Henry 2kd classic tabletop ( cover shorting bar)
only took out the safety resisor, replaced it, amp tunes up but the plate
current meter doesnt do anything, muiltimeter on grid current pegs on some
bands, any comments are appreciated to shortcut the troubleshooting process,
meter diodes, ect??? tnx, ...Doug, w9iix
------------------------------
Message: 3
Date: Fri, 25 Jan 2013 09:29:26 -0600
From: Rob Atkinson <ranchorobbo@gmail.com>
To: Jim Thomson <jim.thom@telus.net>
Cc: amps@contesting.com
Subject: Re: [Amps] 500 uh plate choke
Message-ID:
<CALWD7Z6zQP54CCZTzHgFAgZ_KNRfN2F=f4HDYThYz4R26EjTSg@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
I was quick to credit W8JI in a subsequent post--I certainly do not want to
be seen as stealing ideas, but for some reason anything I post to this
reflector seems to be delayed by 24 hours or longer.
If the result is that I inadvertently appear to be engaged in
self-aggrandizement, then I'll just quit this thing. I'm not all that
interested in amps anymore anyway.
73
Rob
K5UJ
On Fri, Jan 25, 2013 at 5:32 AM, Jim Thomson <jim.thom@telus.net> wrote:
Date: Thu, 24 Jan 2013 05:34:28 -0700
From: John Lyles <jtml@losalamos.com>
To: amps@contesting.com
Subject: [Amps] 500 uh plate choke
K5UJ posted a really great idea to test an RF Choke for resonances,
without needing even a GDO, (although every ham should still have one
of these - in addition to an Almost All Digital L/C IIB meter!). Hams
come up with the greatest ideas for simple methods of doing complex
measurements with little expense, this forum remains the best!
73
John
K5PRO
## W8JI has a similar procedure on his website.
------------------------------
Message: 4
Date: Fri, 25 Jan 2013 10:20:46 -0600
From: "Jeff Blaine" <keepwalking188@yahoo.com>
To: "Larry Benko" <xxw0qe@comcast.net>, <amps@contesting.com>
Subject: Re: [Amps] Ameritron AL-1500 inquiry
Message-ID: <D826BB3706F2448D9C791911013688F5@w520>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=response
Larry,
Who's selling those? I checked Arrow, Jameco, Digikey and Mouser. No joy.
73/jeff/ac0c
www.ac0c.com
alpha-charlie-zero-charlie
-----Original Message-----
From: Larry Benko
Sent: Thursday, January 24, 2013 8:02 PM
To: amps@contesting.com
Subject: Re: [Amps] Ameritron AL-1500 inquiry
Jim,
Look at TE Connectivity (Schrack) RT31C0xx which has the same footprint with
bifurcated contacts. This will fix the intermittent RX issues. I have a
web page with the datasheet at
http://www.w0qe.com/Technical_Topics/small_signal_relays_at_rf.html
73,
Larry, W0QE
On 1/24/2013 8:48 AM, Jim Monahan wrote:
I have a later version of this amp that uses two Schrack sealed T/R
relays
(1 - RTD14012F SPDT 16A and 1 - RTE24012F DPDT 8A both 12VDC) for
antenna switching mounted on a small board.
The manual shows the earlier version with the open frame 3PDT relay.
I use this amp occasionally and has had the problem of intermittent
receive.
The relays have already been replaced once to solve the problem but it
has returned.
Does anyone have a mod or suggestion on how to solve this issue?
I have considered the W7RY QSK mod but I don't use QSK.
Thanks in advance.
Jim, K1PX
K1PX at msn.com
_______________________________________________
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http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
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------------------------------
Message: 5
Date: Fri, 25 Jan 2013 08:21:00 -0800
From: "k7fm" <k7fm@teleport.com>
To: "Jim W7RY" <w7ry@centurytel.net>, <amps@contesting.com>
Subject: Re: [Amps] Ameritron AL-1500 inquiry
Message-ID: <6A866B84B05B4A02B453346B0D3C3B53@COLIN>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=response
"If you hate noisy clanking T-R relays like I do"
Jim: Although I can appreciate the quietness, especially in those amps used
with newer solid state transceivers, there is something romantic about the
heavy clunk and clang of a high powered relay. Can you imagine a Johnson
500 or a BC-610 with a relay so quiet you do not know when you are
transmitting? Next thing you know, you will want a house wiring system
where the lights do not dim.
How will you know when you are transmitting?
I learned long ago how to mount the relay to take advantage of natural
resonances so that a wimpy AF-67 could sound like a KW. It was even better
to mount it near the mike so that all could share in the glory.
The ultimate transmitter was that of the Portland police department in the
late 30s or early 40s. They used to broadcast to the police cars on about
1700 kcs (that was before they were kHz). The problem was that Salt Lake
City police department used the same frequency, and when a car was sent out
on a mission, they did not know if it was the Salt Lake City police or the
Portland Police. The wise person in charge of radio in Portland came up
with a solution. He hooked a large clanger on the wall above the dispatch,
so that when the dispatcher keyed the mike, the clanger would operate and
Portland police knew it was a Portland callout.
Although it worked, there were some negatives, especially for the dispatch
operator. Finally, Portland hired a new man for the job - who happened to
be W7VS. He quickly arrived at a better solution and served faithfully for
decades. K7DVK now owns the clanger.
73, Colin K7FM
------------------------------
Message: 6
Date: Fri, 25 Jan 2013 09:50:44 -0700
From: Larry Benko <xxw0qe@comcast.net>
To: Jeff Blaine <keepwalking188@yahoo.com>
Cc: amps@contesting.com
Subject: Re: [Amps] Ameritron AL-1500 inquiry
Message-ID: <5102B7E4.4000609@comcast.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Jeff, Jim, and a few others who emailed me,
Has no one heard of places like FindChips and Octopart? Don't waste your
time going to distributors one at a time when places like FindChips will do
it for you.
Go to http://www.findchips.com/avail?part=RT31C012 which shows Newark has
274 of them.
73,
Larry, W0QE
On 1/25/2013 9:20 AM, Jeff Blaine wrote:
Larry,
Who's selling those? I checked Arrow, Jameco, Digikey and Mouser. No
joy.
73/jeff/ac0c
www.ac0c.com
alpha-charlie-zero-charlie
-----Original Message----- From: Larry Benko
Sent: Thursday, January 24, 2013 8:02 PM
To: amps@contesting.com
Subject: Re: [Amps] Ameritron AL-1500 inquiry
Jim,
Look at TE Connectivity (Schrack) RT31C0xx which has the same
footprint with bifurcated contacts. This will fix the intermittent RX
issues. I have a web page with the datasheet at
http://www.w0qe.com/Technical_Topics/small_signal_relays_at_rf.html
73,
Larry, W0QE
On 1/24/2013 8:48 AM, Jim Monahan wrote:
I have a later version of this amp that uses two Schrack sealed T/R
relays
(1 - RTD14012F SPDT 16A and 1 - RTE24012F DPDT 8A both 12VDC) for
antenna switching mounted on a small board.
The manual shows the earlier version with the open frame 3PDT relay.
I use this amp occasionally and has had the problem of intermittent
receive.
The relays have already been replaced once to solve the problem but
it has returned.
Does anyone have a mod or suggestion on how to solve this issue?
I have considered the W7RY QSK mod but I don't use QSK.
Thanks in advance.
Jim, K1PX
K1PX at msn.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
------------------------------
Message: 7
Date: Fri, 25 Jan 2013 16:06:47 -0500
From: "Carl" <km1h@jeremy.mv.com>
To: "Rob Atkinson" <ranchorobbo@gmail.com>, "Jim Thomson"
<jim.thom@telus.net>
Cc: amps@contesting.com
Subject: Re: [Amps] 500 uh plate choke
Message-ID: <B6C22210CC73435591C35F00A23E8B27@computer1>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
I wouldnt worry about that Rob, JI never gives credit for ideas he steals
and puts on his pages anyway.
Carl
KM1H
I was quick to credit W8JI in a subsequent post--I certainly do not
want to be seen as stealing ideas, but for some reason anything I post
to this reflector seems to be delayed by 24 hours or longer.
If the result is that I inadvertently appear to be engaged in
self-aggrandizement, then I'll just quit this thing. I'm not all that
interested in amps anymore anyway.
73
Rob
K5UJ
On Fri, Jan 25, 2013 at 5:32 AM, Jim Thomson <jim.thom@telus.net> wrote:
Date: Thu, 24 Jan 2013 05:34:28 -0700
From: John Lyles <jtml@losalamos.com>
To: amps@contesting.com
Subject: [Amps] 500 uh plate choke
K5UJ posted a really great idea to test an RF Choke for resonances,
without needing even a GDO, (although every ham should still have one
of these - in addition to an Almost All Digital L/C IIB meter!). Hams
come up with the greatest ideas for simple methods of doing complex
measurements with little expense, this forum remains the best!
73
John
K5PRO
## W8JI has a similar procedure on his website.
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http://lists.contesting.com/mailman/listinfo/amps
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