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101. Re: [Amps] Terrain Mapping (score: 1)
Author: Steve via Amps <amps@contesting.com>
Date: Mon, 15 Dec 2014 16:00:20 -0500
A quick and dirty look at the terrain around you can be performed using the engine at this site: _www.heywhatsthat.com_ (http://www.heywhatsthat.com) . It's a stupid name, but a really helpful tool.
/archives//html/Amps/2014-12/msg00061.html (7,435 bytes)

102. Re: [Amps] Amps Digest, Vol 144, Issue 18 (score: 1)
Author: Gary Smith via Amps <amps@contesting.com>
Date: Fri, 19 Dec 2014 11:46:56 -0800
Fwiw, I own a late and new from AES Las Vegas, Ameritron Al-82. Full power + read with a Wave Node wattmeter on all bands, 10 meters included. This amp puts to rest the old saw as to "you don't need
/archives//html/Amps/2014-12/msg00069.html (11,106 bytes)

103. [Amps] Need Drake L4/L4b/L7 filament transformer (score: 1)
Author: Louis Parascondola via Amps <amps@contesting.com>
Date: Wed, 24 Dec 2014 07:16:38 -0500
Merry Christmas and Holiday Greetings to all. I'm in need of a filament transformer for the Drake amps. They are all the same. If you have one for sale or know where I can find one for sale please se
/archives//html/Amps/2014-12/msg00089.html (7,025 bytes)

104. [Amps] AL-1200 (score: 1)
Author: Bob Gibson via Amps <amps@contesting.com>
Date: Wed, 24 Dec 2014 17:51:40 +0000 (UTC)
 I'm having a problem with a friends al-1200 amp.. He is 80 years old  I'm 71 and we can not figure this out.. I have replaced the stock P/S board twice.. after a short time it blows out.. I have rep
/archives//html/Amps/2014-12/msg00091.html (6,957 bytes)

105. Re: [Amps] AL-1200 (score: 1)
Author: Louis Parascondola via Amps <amps@contesting.com>
Date: Wed, 24 Dec 2014 13:34:06 -0500
Yes, make sure the plate transformer is NOT using the green wire instead of the brown/white lead. If the green wire is used it can very well up the HV to 3900 volts will eventually stress out the fil
/archives//html/Amps/2014-12/msg00093.html (8,866 bytes)

106. Re: [Amps] AL-1200 (score: 1)
Author: Bob Gibson via Amps <amps@contesting.com>
Date: Wed, 24 Dec 2014 18:45:19 +0000 (UTC)
I have added a WD7S ABOARD WHICH HAS 10 FILTER CAPS ON IT..I do need to check the input voltage and the wires to the transformer.. that is one thing I have not done..I replaced the step start because
/archives//html/Amps/2014-12/msg00094.html (9,921 bytes)

107. Re: [Amps] AL-1200 (score: 1)
Author: Louis Parascondola via Amps <amps@contesting.com>
Date: Wed, 24 Dec 2014 13:52:41 -0500
Bob, although it is not unusual for the BIG BOX Ameritron amps to let the smoke out of the caps at some point, it is most unlikely to have the diodes blow. In fact in the many years I have been repai
/archives//html/Amps/2014-12/msg00095.html (10,230 bytes)

108. [Amps] L4B biasing (score: 1)
Author: mike via Amps <amps@contesting.com>
Date: Wed, 24 Dec 2014 15:52:42 -0500
I just finished me Drake power supply. I used a Drake transformer and a doubler board with 8 caps. I have 2600 volts showing on the high voltage meter. I have eliminated all the bias circuit in the p
/archives//html/Amps/2014-12/msg00096.html (6,692 bytes)

109. Re: [Amps] L4B biasing (score: 1)
Author: "Steven Grant, W4IIV via Amps" <amps@contesting.com>
Date: Thu, 25 Dec 2014 21:37:03 +0000 (UTC)
A 3-500 amp does not need bias unless it is run at 3000 volts or above. 200 mills of idling current is normal for this amp I just finished me Drake power supply. I used a Drake transformer and a doub
/archives//html/Amps/2014-12/msg00102.html (8,282 bytes)

110. [Amps] 222 mhz 8877 amplifier questions (score: 1)
Author: mike via Amps <amps@contesting.com>
Date: Sat, 27 Dec 2014 13:45:40 -0500
I would like to converse with someone who has built a W6PO 222 mhz amplifier. I am having difficulties getting much power out of it compared to input power. Mike _____________________________________
/archives//html/Amps/2014-12/msg00108.html (6,642 bytes)

111. [Amps] Power from a pair of 4CX150/4CX250 tubes (score: 1)
Author: Donald Fox via Amps <amps@contesting.com>
Date: Sat, 27 Dec 2014 20:04:01 -0800
In the 80's, I ran a homebrew (not by me) pair of 4CX250 tubes on 6. As Carl says, screen and bias regulation were important. Using good old VR tubes for screen regulation, I believe it ran 300 volts
/archives//html/Amps/2014-12/msg00116.html (7,388 bytes)

112. [Amps] Free manuals (score: 1)
Author: Kathy Bookmiller via Amps <amps@contesting.com>
Date: Sat, 3 Jan 2015 12:59:10 -0800
I'm posting this for Bob,K2IGW Of note, is that there are 3 manuals for amps. some one may find interesting. Plus some antenna/rotator's that may be of use. Contact him direct: k2igw@q.com SPECTRONIC
/archives//html/Amps/2015-01/msg00004.html (6,784 bytes)

113. [Amps] (no subject) (score: 1)
Author: Jack Gibbons via Amps <amps@contesting.com>
Date: Sun, 4 Jan 2015 18:48:34 +0000 (UTC)
has anybody used a gu35/40 in grounded grid? _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2015-01/msg00006.html (6,543 bytes)

114. Re: [Amps] Alpha Input SWR (score: 1)
Author: Gerald Williamson via Amps <amps@contesting.com>
Date: Sun, 11 Jan 2015 11:29:07 -0500
Hi All, as Ron and others said, the theory is solid: swr is determined by the ratio between the transmission line impedance and load impedance. What is often overlooked is that the load impedance of
/archives//html/Amps/2015-01/msg00029.html (12,643 bytes)

115. Re: [Amps] The genius of ham radio (score: 1)
Author: Glen Zook via Amps <amps@contesting.com>
Date: Mon, 12 Jan 2015 16:39:45 +0000 (UTC)
Absolute theory doesn't change.  However, mankind's understanding, and interpretation, of theory can definitely change and such has happened many times over the years. Glen, K9STH Website: http://k9s
/archives//html/Amps/2015-01/msg00045.html (8,665 bytes)

116. Re: [Amps] The genius of ham radio (score: 1)
Author: Mike via Amps <amps@contesting.com>
Date: Mon, 12 Jan 2015 19:13:03 -0500
You probably couldn't get enough Hams to agree on any one thing to make the effort worth it. Maybe a alternative Handbook of Hams opinions? That oughta fill volumns! Mike W2GR -- In a message dated 1
/archives//html/Amps/2015-01/msg00058.html (8,249 bytes)

117. Re: [Amps] The genius of ham radio (score: 1)
Author: Gerald Williamson via Amps <amps@contesting.com>
Date: Tue, 13 Jan 2015 10:28:20 -0500
Wouldn't a tuned circuit be most any LC adjusted for resonance as in receivers and other low level applications. And a tank circuit is primarily for a higher power transmitter application? Gerald K5G
/archives//html/Amps/2015-01/msg00086.html (14,443 bytes)

118. Re: [Amps] Amps Digest, Vol 145, Issue 15 (score: 1)
Author: Gary Smith via Amps <amps@contesting.com>
Date: Tue, 13 Jan 2015 09:37:43 -0800
To all: I signed up on the amps reflector to learn more about high Po amps only to learn (and enjoy) reading the views up and down, left and right about other things that have often intrigued me, the
/archives//html/Amps/2015-01/msg00090.html (7,980 bytes)

119. [Amps] The genius of ham radio (score: 1)
Author: Gary Smith via Amps <amps@contesting.com>
Date: Tue, 13 Jan 2015 09:39:32 -0800
To all: I signed up on the amps reflector to learn more about high Po amps only to learn (and enjoy) reading the views up and down, left and right about other things that have often intrigued me, the
/archives//html/Amps/2015-01/msg00091.html (7,909 bytes)

120. Re: [Amps] Input SWR revisited (score: 1)
Author: Gerald Williamson via Amps <amps@contesting.com>
Date: Wed, 14 Jan 2015 15:33:14 -0500
Good question Don. You have to keep in mind that the 100 ohm load will make for a 1.333 swr in the 75 ohm coax. At a length of one quarter wavelength the 100 ohm load impedance is transformed to 56 o
/archives//html/Amps/2015-01/msg00109.html (10,508 bytes)

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