Stop!!!!!!!!!!!!!!!!!!
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
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Sent: Tuesday, February 17, 2009 12:00 PM
To: amps@contesting.com
Subject: Amps Digest, Vol 74, Issue 64
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Today's Topics:
1. Metron/TWE 500 watt SS amp - need help! (North Pole)
2. best atu (Allan Greening)
3. Re: best atu (Mike, K6BR)
4. Re: Metron/TWE 500 watt SS amp - need help! (Chuck & Vicki Tifft)
5. Antenna tuners (Dan Hearn)
6. Re: best atu (Edward Swynar)
7. Metron/TWE 500M Fixed (North Pole)
8. best atu (Allan Greening)
9. 160m mod to SB220 (chas)
10. Re: pc board material (Gary K9GS)
11. Homebrewed "SPC" Transmatch (Edward Swynar)
----------------------------------------------------------------------
Message: 1
Date: Mon, 16 Feb 2009 17:39:40 -0500
From: "North Pole" <w8ccy@charter.net>
Subject: [Amps] Metron/TWE 500 watt SS amp - need help!
To: <amps@contesting.com>
Message-ID: <D0BACDC3679B42C2B839DF9966987A5F@DFQ50NB1>
Content-Type: text/plain; charset="iso-8859-1"
I have a Trans World Electronics 500M with 8 Motorola MRF 454 transistor
finals. I was playing around the other night with my K2 qrp rig keying
about 8 or 9 watts into the amplifier. It amazed me how well it was working
as I was getting an easy 100 plus watts and it seemed like I was still
enjoying the qsk of the K2.
Unfortunately, I put my hand on the heat sink and it was hot. Usually on
ssb it hardly gets warm even with the occasional rag chew. I looked at the
amp meter and the collector was drawing 20 amps with no rf input. I quickly
shut things down. The next morning I popped the cover just to give a visual
inspection. There is no apparent physical damage nor burnt odor.
I put 50 or 60 watts of ssb rf into it last night and the amp easily put out
over 500 watts drawing 70 amps on peaks. But,again, once the mike was keyed
it drew 20 amps without any modulation.
I am really not much of an electronics tech but open to any advice, comments
or trouble shooting tips anyone may care to share. Or if there is a repair
service that will work on a Metron. I hate to toss it out as I seldom need
the 500 watts but its the only way I will get on 75 meters in the evening.
Meanwhile back to cw qrp with the good old K2.
Thanks for reading, Larry W8CCY
------------------------------
Message: 2
Date: Tue, 17 Feb 2009 09:42:15 +1100 (EST)
From: "Allan Greening" <vk3pa@vk3pa.com>
Subject: [Amps] best atu
To: Amps@contesting.com
Message-ID: <61958.124.176.206.32.1234824135.squirrel@65.99.229.10>
Content-Type: text/plain;charset=iso-8859-1
On 80m here in vk we have 3.500 to 3.7 es 3779 to 3.8 dx window. yes it is a
jump cw to ssb " but' i switch in a extra matching network at the phasing
box, this is not perfect as the phasing line r to short. but a much better
method than to try to match at the rig end..i use triangle phase array.. 3
by 1/4 verticals wid 120 radial per vertical..
------------------------------
Message: 3
Date: Mon, 16 Feb 2009 15:10:10 -0800
From: "Mike, K6BR" <noddy1211@sbcglobal.net>
Subject: Re: [Amps] best atu
To: <amps@contesting.com>
Message-ID: <007b01c9908b$b7bc13a0$27343ae0$@net>
Content-Type: text/plain; charset="us-ascii"
Ever think about a Carolina Windom?
My dummy load is a good match for 50 ohms as well, does not get out good
though:-)
Mike
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Paul Kraemer
Because sum of us are just po folk wid no mega real estate fo dem bunch
antennas an rig fo evry band.
Dat's why. We jes tryin to njoy the hobby as bes we can.
Paul K0UYA
----- Original Message -----
From: "Allan Greening" <vk3pa@vk3pa.com>
To: <amps@contesting.com>
Sent: Monday, February 16, 2009 3:23 PM
Subject: [Amps] best atu
>I must be dumb ! I have never used a ATU, as all my antennas are
>matched to each radio.. I use 1 t/ceiver to 1 antenna es all antennas
>are matched for 50 ohms ..So why use or need a ATU? WHEN THE ANTENNAS
>r matched correctly!! de vk3pa
>_______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
_______________________________________________
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------------------------------
Message: 4
Date: Mon, 16 Feb 2009 15:12:56 -0800
From: Chuck & Vicki Tifft <cftifft@sbcglobal.net>
Subject: Re: [Amps] Metron/TWE 500 watt SS amp - need help!
To: North Pole <w8ccy@charter.net>
Cc: amps@contesting.com
Message-ID: <4999F2F8.5080405@sbcglobal.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
My manual says the idle current should be 4 amps...If not, to check
adjustment of R3 (bias adjustment)..If the idle current can not be set
to about 4 amps (.625 vdc on the bases of the 454's) if not then to
check the Q1/Q2 bias circuit operation...Let me know if you need more
info. I have the complete manual ( a photocopy, that cost me $65 from
Trans-world)..Sounds to me like an adjustment should do it for you, as
the amps seem to be working. Current should be 45 to 60 amps on voice peaks.
73's
Chuck
W6RD
North Pole wrote:
> I have a Trans World Electronics 500M with 8 Motorola MRF 454 transistor
finals. I was playing around the other night with my K2 qrp rig keying
about 8 or 9 watts into the amplifier. It amazed me how well it was working
as I was getting an easy 100 plus watts and it seemed like I was still
enjoying the qsk of the K2.
>
> Unfortunately, I put my hand on the heat sink and it was hot. Usually on
ssb it hardly gets warm even with the occasional rag chew. I looked at the
amp meter and the collector was drawing 20 amps with no rf input. I quickly
shut things down. The next morning I popped the cover just to give a visual
inspection. There is no apparent physical damage nor burnt odor.
>
> I put 50 or 60 watts of ssb rf into it last night and the amp easily put
out over 500 watts drawing 70 amps on peaks. But,again, once the mike was
keyed it drew 20 amps without any modulation.
>
> I am really not much of an electronics tech but open to any advice,
comments or trouble shooting tips anyone may care to share. Or if there is
a repair service that will work on a Metron. I hate to toss it out as I
seldom need the 500 watts but its the only way I will get on 75 meters in
the evening.
>
> Meanwhile back to cw qrp with the good old K2.
>
> Thanks for reading, Larry W8CCY
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
------------------------------
Message: 5
Date: Mon, 16 Feb 2009 15:14:34 -0800
From: "Dan Hearn" <n5ar@air-pipe.com>
Subject: [Amps] Antenna tuners
To: <amps@contesting.com>
Message-ID: <4DFE725E87BD46399597E23F9C3FA81A@ownerb9843dfc0>
Content-Type: text/plain; charset="iso-8859-1"
ARRL did a rather thorough test of a number of commercial tuners several
years ago. They tested them on 160-10m and with loads well below and above
50 ohms. I recall that several were extremely lossy on 160 with severe
loads. The article is on the ARRL web site and can be found with a search if
you are an ARRL member. I don't have the link here.
73, Dan, N5AR
------------------------------
Message: 6
Date: Mon, 16 Feb 2009 18:28:15 -0500
From: "Edward Swynar" <gswynar@durham.net>
Subject: Re: [Amps] best atu
To: "Allan Greening" <vk3pa@vk3pa.com>, <amps@contesting.com>
Message-ID: <003901c9908e$3e5d0890$3521334a@COMPAQ>
Content-Type: text/plain; charset="iso-8859-1"
Hi Allan,
Well, an ATU (properly designed) will help keep your harmonics / spurious
signals from being radiated --- AND it'll add front-end selectivity to your
receiver, for starters...
"...To each his / her own", though! Hi Hi.
~73~ Eddy VE3CUI - VE3XZ
*******************************************
----- Original Message -----
From: "Allan Greening" <vk3pa@vk3pa.com>
To: <amps@contesting.com>
Sent: Monday, February 16, 2009 4:23 PM
Subject: [Amps] best atu
> I must be dumb ! I have never used a ATU, as all my antennas are matched
> to each radio.. I use 1 t/ceiver to 1 antenna es all antennas are matched
> for 50 ohms ..So why use or need a ATU? WHEN THE ANTENNAS r matched
> correctly!! de vk3pa
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
------------------------------
Message: 7
Date: Mon, 16 Feb 2009 19:38:52 -0500
From: "North Pole" <w8ccy@charter.net>
Subject: [Amps] Metron/TWE 500M Fixed
To: <amps@contesting.com>
Message-ID: <132E9856FCC04C0FB140B8C9EBFB79F0@DFQ50NB1>
Content-Type: text/plain; charset="iso-8859-1"
What a fantastic forum. Before my first post I hear from Chuck W6RD, who
obviously is familiar with the Metron amps, with the fix for my problem.
Thank you so much Chuck and the others who responded to my post. A simple
adjustment of the bias was all it took. Chuck gave me the confidence to
give it a try. Hard to believe the idle current could make such a dramatic
jump. Think I will stick to the occasional ssb usage.
These ham radio forums have sure enhanced my enjoyment of the hobby. Can't
imagine ham radio without the internet support. A marriage made in heaven?
73 all, Larry
------------------------------
Message: 8
Date: Tue, 17 Feb 2009 11:47:36 +1100 (EST)
From: "Allan Greening" <vk3pa@vk3pa.com>
Subject: [Amps] best atu
To: amps@contesting.com
Message-ID: <61094.124.176.206.32.1234831656.squirrel@65.99.229.10>
Content-Type: text/plain;charset=iso-8859-1
yes we run Dunestar BPF MODEL 600 ON ALL RIGS ES COAX FILTERS STUBS AFTER
AMPS ES MOST AMPS HAVE PI /l OUTPUTSS..
------------------------------
Message: 9
Date: Mon, 16 Feb 2009 23:31:51 -0600
From: chas <chasm@texas.net>
Subject: [Amps] 160m mod to SB220
To: Amps Amps <amps@contesting.com>
Message-ID: <499A4BC7.80807@texas.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Given: SB-220 240VAC, fully modded with Harbach and Measures addons.
STILL trying to get outside the ham bands for MARS...
What I would really like is to have a 6 tap bandswitch
set for
2.2mhz
3.2mhz
4.0mhz
5.0mhz
7.2mhz and
14.0mhz
actually, I would not mind adding a couple more but that will do.
however, while Harbach has the bandswitch wafer, I do not know what it
would take to set the taps to these freqs - IF it could even be done.
I am sure that I will have to add another plate coil for 160m.
so, assuming the above to be a formidable task...
I wonder how difficult it would be to add a 160m position to the
present bandswitch wafer or to add the Harbach SW-100 --
> SW-100 Replacement Band Switch Wafer for Heathkit SB-200 & SB-220
>
> The SW-100 is an exact replacement ceramic tank circuit band switch
> wafer for Heathkit SB-200 & SB-220 series amplifiers. This wafer
> also has extra contacts for those wanting to add additional band
> coverage. These wafers should also work in other amplifiers, such
> as the Heathkit HL-2200, Dentron Clipperton L, MLA-2500, Ameritron
> AL-80B, etc.
Also, I have RMeasure's mss on adding the 160m to the SB-220
http://www.somis.org/add-160m.html
while there is someone selling a two page document with parts list on
ebay for $10.00 .
http://cgi.ebay.com/eBayISAPI.dll?ViewItem&item=360125145991
which is the better way?
has anyone done this?
Advice please?
thanks 73 de chas/ k5dam
...
------------------------------
Message: 10
Date: Tue, 17 Feb 2009 00:22:53 -0600
From: "Gary K9GS" <garyk9gs@wi.rr.com>
Subject: Re: [Amps] pc board material
To: "Steve Flood" <kk7uv@bresnan.net>, <amps@contesting.com>
Message-ID: <044A6AE4DEAA4DD088F97913D2C50044@UEI.COM>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Hi Steve,
I suggest looking to see if there is a local PCB fabrication shop in your
area. If there is, ask to talk to their production manager. They probably
will let you have a bunch of scrap/cutoffs. It's a win-win for them as they
don't have to pay a scrap dealer to recycle and haul it away. Tell them you
want some FR-4/G-10 material.
A Google search would probably work well.
73,
Gary K9GS
++++++++++++++++++++++++++++++++++++++++++++++++
K9GS
Gary Schwartz email: k9gs (at) arrl.net
Check out K9NS on the web: http://www.k9ns.com
Society of Midwest Contesters (SMC) http://www.w9smc.com/
GMDXA http://www.eng.mu.edu/gmdxa/
++++++++++++++++++++++++++++++++++++++++++++++++
----- Original Message -----
From: "Steve Flood" <kk7uv@bresnan.net>
To: <amps@contesting.com>; <rfamplifiers@yahoogroups.com>
Sent: Monday, February 16, 2009 8:47 AM
Subject: [Amps] pc board material
>I had some light-green, undrilled, unclad, fiberglass board material that
>was great for simple point-to-point circuits. My supply is exhausted.
>Does anyone know a source for this material? Websearching has not been
>productive. Perhaps it has a tradename I do not know.
>
> Tnx,
> Steve KK7UV
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
------------------------------
Message: 11
Date: Tue, 17 Feb 2009 08:24:08 -0500
From: "Edward Swynar" <gswynar@durham.net>
Subject: [Amps] Homebrewed "SPC" Transmatch
To: "Robert Kirkland" <alpha76@triton.net>, <amps@contesting.com>
Message-ID: <004d01c99103$04291360$8021334a@COMPAQ>
Content-Type: text/plain; charset="iso-8859-1"
On 16th February, Bob wrote:
"...Looks nice Ed but that empty area sure could use the diagram of the
tuner. Not all of us are in a position to get it..."
***********************************
Hi Again Bob, Et Al,
If you click back onto my Flickr website again, you'll see that I've added a
scanned copy of the transmatch circuit ("...back by popular demand!", Hi)
which inspired me here in the construction of mine...
http://www.flickr.com/photos/15888272@N05/3287811310/
I apologize for the poor quality of the scan --- still, I'm sure that anyone
interested in building their own version of the SPC transmatch will readily
get the gist of it (any queries as to specifics may be directed to me...I'll
be only too happy to assist).
Let's see some pix of OTHER homebrewed creations in the matter of
transmatches! It just blows me away, the amount of BIG $$$ that some
manufacturers command for commercial "appliance" versions of these things.
These rigs are probably THE easisest pieces of equipment for to-day's
Amateurs to build that can see daily use in the shack --- heck, they don't
even have to be shielded!
I'd wager that most (if not all) of the parts for one of these rascals could
easily be purchased dirt cheap at nearby Hamfests...and EVERY OT worth his
salt has a treasure trove of parts stashed away that are just ACHING to be
put to good use. All you have to do is ask! Most Hams are more than happy to
oblige, knowing that their gems are going to a good home in this way...
So come on, all you non-builders out there: what are you waiting for...?!
Dust off that old Weller iron, and get to work --- you won't regret the
experience, OR the fruits of your labour...!!!
~73~ Eddy VE3CUI - VE3XZ
------------------------------
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