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To: amps@contesting.com
Subject: Amps Digest, Vol 14, Issue 2
Date: Mon, 2 Feb 2004 09:22:59 -0500 (EST)
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Today's Topics:
1. Re: Re: Amps Digest, Vol 13, Issue 52 (Ed Briggs)
2. Re: BTI (R.Measures)
3. Re: Re: Amps Digest, Vol 13, Issue 52 (R.Measures)
4. Re: Re: matching network (R.Measures)
5. Coleman lantern chimneys for 3CX1200A7/Z7 and 3-500Z
(W0UN -- John Brosnahan)
6. Re: Re: Amps Digest, Vol 13, Issue 52 (Jan Erik Holm)
7. Re: Re: Amps Digest, Vol 13, Issue 52 (David A. Pruett)
8. RE: bird 43 slug (Skram, Helge (MED))
9. RF Deck Amplifier Component Package
----------------------------------------------------------------------
Date: Sun, 01 Feb 2004 09:43:04 -0500
From: Ed Briggs <edbriggs@optonline.net>
To: W0UN -- John Brosnahan <shr@swtexas.net>, K3vw@aol.com,
amps@contesting.com
Subject: Re: [Amps] Re: Amps Digest, Vol 13, Issue 52
Message-ID: <002401c3e8d1$b37da270$6701a8c0@sonybox>
References: <5.2.1.1.2.20040131213134.00b90478@pop3.swtexas.net>
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RF Parts sells 3 different chimneys for the 3-500; the are 4, 4.25, and
4.75 inches tall respectively to accomodate (among other things) recessed
sockets.
Ameritron sells the 3-500 chimney for $22, which is substantially less than
the above. This model is also used with a 1200a7 and a recessed socket.
Ed
----- Original Message -----
From: "W0UN -- John Brosnahan" <shr@swtexas.net>
To: <K3vw@aol.com>; <amps@contesting.com>
Sent: Saturday, January 31, 2004 10:36 PM
Subject: Re: [Amps] Re: Amps Digest, Vol 13, Issue 52
> At 04:56 PM 1/31/2004, K3vw@aol.com wrote:
>
> >You can use a 3-500Z chimney with the 3CX1200A7, Ameritron does ! Willy
K3VW
>
> So, if the Coleman lantern double mantle chimney works with a 4-400A
> and that is the same size as a 3-500Z and if the 3-500Z chimney
> works on the 3CX1200A7 then it sounds like the Coleman
> lantern double mantle chimney should work with a 3CX1200A7.
>
> Can anyone confirm that this is the case? Don't know the price of
> the Coleman lantern chimney these days but it used to be a
> relatively inexpensive way to get Pyrex glass for your 4-400As.
>
> Since I have a couple of 3CX1200xx tubes (A7 and Z7) but no
> chimneys this would be a good thing to know. Except for the
> fact that a clear chimney is a real waste with an external anode
> tube.
>
> --John W0UN
>
>
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------------------------------
Date: Sun, 1 Feb 2004 07:11:05 -0800
From: R.Measures <r@somis.org>
To: "Roger Cranford K5ALU" <k5alu@yahoo.com>,
" AMPS" <amps@contesting.com>
Subject: [Amps] Re: BTI
Message-ID: <20040201151120.564263197BD@dayton.akorn.net>
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** The principles for adding 160m to an 80m - 10m amplifier are outlined
in:
http://www.somis.org/add.160m.html
- Unless the bandswitch is toasted from parasitic-arcing, there is no
reason to make a BTI into a monobander.
>Hi !!
>
>Do you know of anyone who have modified the old BTI
>for 160 meters ?? We have a couple here we want to
>single band one for 160.
>
>Many thanks and 73
>de
>RED K5ALU
>Springfield,MO
>
>=====
>Roger Cranford
>K5ALU "RED"
>
>__________________________________
>Do you Yahoo!?
>Yahoo! SiteBuilder - Free web site building tool. Try it!
>http://webhosting.yahoo.com/ps/sb/
>
------------------------------
Date: Sun, 1 Feb 2004 07:23:35 -0800
From: R.Measures <r@somis.org>
To: "W0UN -- John Brosnahan" <shr@swtexas.net>, <K3vw@aol.com>,
" AMPS" <amps@contesting.com>
Subject: Re: [Amps] Re: Amps Digest, Vol 13, Issue 52
Message-ID: <20040201152349.35BCB31982F@dayton.akorn.net>
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>At 04:56 PM 1/31/2004, K3vw@aol.com wrote:
>
>>You can use a 3-500Z chimney with the 3CX1200A7, Ameritron does ! Willy
K3VW
>
>So, if the Coleman lantern double mantle chimney works with a 4-400A
>and that is the same size as a 3-500Z and if the 3-500Z chimney
>works on the 3CX1200A7 then it sounds like the Coleman
>lantern double mantle chimney should work with a 3CX1200A7.
>
>Can anyone confirm that this is the case? Don't know the price of
>the Coleman lantern chimney these days but it used to be a
>relatively inexpensive way to get Pyrex glass for your 4-400As.
>
>Since I have a couple of 3CX1200xx tubes (A7 and Z7) but no
>chimneys this would be a good thing to know. Except for the
>fact that a clear chimney is a real waste with an external anode
>tube.
>
** John -- A friend who worked in the broadcast industry told me that
tetrodes with handles (such as the 8281) emit blue-light from their
ceramic anode insulator. This phenomenon is apparently due to electrons
missing the anode, and impacting the ceramic -- which causes
flourescence.
------------------------------
Date: Sun, 1 Feb 2004 07:25:50 -0800
From: R.Measures <r@somis.org>
To: "Ian White, G3SEK" <g3sek@ifwtech.co.uk>,
" AMPS" <amps@contesting.com>
Subject: Re: [Amps] Re: matching network
Message-ID: <20040201152604.20940319808@dayton.akorn.net>
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>R. Measures wrote:
>>>>** Ian -- How does one convert this figure into a determination of
>>>>how grid current divides between the grid and the screen during g-g
>>>>operation?
>>>
>>>
>>>Sorry, maybe what I said was misleading - I'm not sure if it's possible
>>>to calculate Ig1/Ig2 in cathode-driven operation directly from mu-g1g2.
>>>
>>>They both result from the tube's internal tube construction, however,
>>>which is why I believe that if one is high, the other will be too.
>>>
>>** So if a tetrode with a g-/g2 amplification of 4 to 5 has c. 25% of
>>total grid current flowing in the screen, a tube with a g/g2
>>amplification of 13 might have c. 8% of the total grid-current flowing
in
>>the screen?
>
>Couldn't say... you'd have to do a point-by-point analysis using the
>characteristic curves.
>
** Ian -- The sticky wicket is that there are no characteristic curves
for 0V on the screen.
------------------------------
Date: Sun, 01 Feb 2004 09:42:10 -0600
From: W0UN -- John Brosnahan <shr@swtexas.net>
To: amps@contesting.com
Subject: [Amps] Coleman lantern chimneys for 3CX1200A7/Z7 and 3-500Z
Message-ID: <5.2.1.1.2.20040201093613.0292c390@pop3.swtexas.net>
In-Reply-To: <002401c3e8d1$b37da270$6701a8c0@sonybox>
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While at Alpha/Power I learned how easy it is to make the
silicon rubber chimneys used in Alpha amps--the only real
problem is finding a decent source for the material in
small quantities.
Just checked out some Coleman replacement chimneys
for their double mantle lanterns and the going price is about
$8.50. Pretty decent price for a Pyrex chimney for the
3-500 and 3XC1200 tubes--assuming it fits OK.
Think I will measure my 1200s and see what diameter and
height of chimney they require and the next time I go to town
I will purchase one to play with.
--John W0UN
At 08:43 AM 2/1/2004, Ed Briggs wrote:
>RF Parts sells 3 different chimneys for the 3-500; the are 4, 4.25, and
>4.75 inches tall respectively to accomodate (among other things) recessed
>sockets.
>
>Ameritron sells the 3-500 chimney for $22, which is substantially less
than
>the above. This model is also used with a 1200a7 and a recessed socket.
>
>Ed
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------------------------------
Date: Sun, 01 Feb 2004 18:49:56 +0100
From: Jan Erik Holm <sm2ekm@telia.com>
To: amps@contesting.com
Subject: Re: [Amps] Re: Amps Digest, Vol 13, Issue 52
Message-ID: <401D3C44.2050800@telia.com>
In-Reply-To: <5.2.1.1.2.20040131213134.00b90478@pop3.swtexas.net>
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I checked the Coleman web page but couldn´t find any
chimneys, any clue where to find them? Maybe they are
there someplace but I didn´t spot them.
73 Jim SM2EKM
------------------------------------------------------
W0UN -- John Brosnahan wrote:
> At 04:56 PM 1/31/2004, K3vw@aol.com wrote:
>
>> You can use a 3-500Z chimney with the 3CX1200A7, Ameritron does !
>> Willy K3VW
>
>
> So, if the Coleman lantern double mantle chimney works with a 4-400A
> and that is the same size as a 3-500Z and if the 3-500Z chimney
> works on the 3CX1200A7 then it sounds like the Coleman
> lantern double mantle chimney should work with a 3CX1200A7.
>
> Can anyone confirm that this is the case? Don't know the price of
> the Coleman lantern chimney these days but it used to be a
> relatively inexpensive way to get Pyrex glass for your 4-400As.
>
> Since I have a couple of 3CX1200xx tubes (A7 and Z7) but no
> chimneys this would be a good thing to know. Except for the
> fact that a clear chimney is a real waste with an external anode
> tube.
>
> --John W0UN
>
>
> ------------------------------------------------------------------------
>
>
> ---
> Outgoing mail is certified Virus Free.
> Checked by AVG anti-virus system (http://www.grisoft.com).
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------------------------------
Date: Sun, 01 Feb 2004 14:29:45 -0500
From: "David A. Pruett" <k8cc@comcast.net>
To: K3vw@aol.com, amps@contesting.com
Subject: Re: [Amps] Re: Amps Digest, Vol 13, Issue 52
Message-ID: <5.2.1.1.0.20040201142406.00aad3c0@mail.comcast.net>
In-Reply-To: <5.2.1.1.2.20040131213134.00b90478@pop3.swtexas.net>
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I don't think a 3-500Z chimney will work with the 3CX1200A7. The *sockets*
are the same, but the chimneys aren't. Even Eimac recomments a different
chimney part number use with the 3CX1200.
I would be very leery of using Coleman lantern chimneys with the
3CX1200. The Coleman chimneys I have (acquired along with a pair of
4-400As) are essentially just glass cylinders, with no reduction in
diameter at the top to direct air at the plate seal. I suspect these work
OK with glass tubes by directing the air past the major diameter of the
envelope, although the plate seals will be left without direct cooling. In
the case of the 3CX1200, the chimney is there to force air through the
cooling fins. The Coleman chimneys won't do that very well at all.
There may be different Coleman chimneys - I'm just relating what I've seen.
Scrimping on chimneys seems to be poor economy to me when you consider the
price of tubes.
Dave/K8CC
At 09:36 PM 1/31/04 -0600, W0UN -- John Brosnahan wrote:
>At 04:56 PM 1/31/2004, K3vw@aol.com wrote:
>
>>You can use a 3-500Z chimney with the 3CX1200A7, Ameritron does ! Willy
K3VW
>
>So, if the Coleman lantern double mantle chimney works with a 4-400A
>and that is the same size as a 3-500Z and if the 3-500Z chimney
>works on the 3CX1200A7 then it sounds like the Coleman
>lantern double mantle chimney should work with a 3CX1200A7.
>
>Can anyone confirm that this is the case? Don't know the price of
>the Coleman lantern chimney these days but it used to be a
>relatively inexpensive way to get Pyrex glass for your 4-400As.
>
>Since I have a couple of 3CX1200xx tubes (A7 and Z7) but no
>chimneys this would be a good thing to know. Except for the
>fact that a clear chimney is a real waste with an external anode
>tube.
>
>--John W0UN
>
>
>
>
>---
>Outgoing mail is certified Virus Free.
>Checked by AVG anti-virus system (http://www.grisoft.com).
>Version: 6.0.564 / Virus Database: 356 - Release Date: 1/19/2004
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------------------------------
Date: Mon, 2 Feb 2004 13:41:56 +0100
From: "Skram, Helge (MED)" <helge.skram@med.ge.com>
To: RICHARD GEORGE <k6kwq@msn.com>, amps <amps@contesting.com>
Subject: RE: [Amps] bird 43 slug
Message-ID: <82DBBA91AF7DA44286B33CE67B8C937602CB3D4A@frbucmsx01medge>
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Hello
I purchased new from RF Parts one of the Bird 500w 400-1000MHz, that I
intended to use on 1296MHz measuring power from a 2x7289 cavity amp.
I have 3 Bird 43 meters in use.
I stopped using the Bird 500w probe after it was verified to measure low by
about 25%. There was also some erratic behaviour at high power levels.
Purchased a EME directional coupler from SSB Electronis and this perfomed
wery well and according to expectations. However maximum power is limited
to
200w at 1296MHz. Therefore I now have a 1-4GHz directional coupler from
Narda, capable of 500w. This didn't cost me much more than a Bird slug and
is highly recomended. Will need diode heads and meter. Was purchased second
hand from Stewart of Reading in England.
It is correct that the Bird slugs are more broadband at higher power
levels.
A 1000w 400-1000MHz probe should be reasonable accurate at 1296MHz.
A 500w (at least mine) is so so.
You can recalibrate the Bird slugs if you dare. There is a small trimpot in
the probe that can be adsjusted.
Have to remove the cover by heating it with a heatgun.
To recalibrate Bird slugs you must have a primary reference with good
accuracy.
73 de LA6MV
Helge
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]On
Behalf Of RICHARD GEORGE
Sent: 31. januar 2004 03:28
To: amps
Subject: [Amps] bird 43 slug
Has any one ever had Bird make a custom slug for a Bird 43 wattmeter? I
need
a 500 watt slug for 1296mhz.
Thanks
K6KWQ Dick "12 Volt radios are for wimps, real radios can kill you" Still
can't make it go QRO with "More Power"
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------------------------------
Date: Mon, 2 Feb 2004 08:03:46 -0500
From: w2cqm@juno.com
To: Amps@contesting.com
Subject: [Amps] RF Deck Amplifier Component Package
Message-ID: <20040202.080730.2456.0.W2CQM@juno.com>
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Offering essential and difficult to locate components for a homebrew
10-80m 1500W amplfier project. Package includes a complete, intact,
fully wired silver plated tank/bandswitch assembly. Bandswitch is a high
quality porcelain Radio Switch(w/detents) easily reconfigured for up to
a 1P8T circuit for switching in additional inductance for WARC bands or
160m. Includes a 1" custom HD porcelain high voltage plate choke, wide
spaced antenna tune capacitor w/padder, a dual section antenna tune
cap, (2) 12V/10w zeners, and a parasitic choke/blocking capacitor. $140+
shipping. Ron W2CQM/3
------------------------------
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End of Amps Digest, Vol 14, Issue 2
***********************************