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1. [AMPS] Re: Another 1KW Transmitter (score: 1): Author: hbrown@voicenet.com (Harry Brown); Date: Fri, 17 Nov 2000 12:35:58 +0000; Philip, Yes, Amplifier Research makes amplifiers like the one. Their web page is at www.amplifiers.com -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrativ; /archives//html/Amps/2000-11/msg00190.html (7,833 bytes)
2. [AMPS] Bird meters (score: 1): Author: hbrown@voicenet.com (Harry Brown); Date: Mon, 02 Oct 2000 10:08:10 -0400; Peter, Your use of an op amp to buffer the current to the meter current of your choice will work fine since the meter itself is linear. Just make sure that the input of the op amp looks like 1400 ohm; /archives//html/Amps/2000-10/msg00036.html (10,489 bytes)
3. [AMPS] Bird meters (score: 1): Author: hbrown@voicenet.com (Harry Brown); Date: Mon, 02 Oct 2000 10:34:15 -0400; Peter, There is a company in the US that builds a small circuit board adapter that allows you to switch from to peak readings if you like. Their web page is http://www.rust.net/~hires/ -- 73, Harry,; /archives//html/Amps/2000-10/msg00042.html (9,984 bytes)
4. [AMPS] L7 Amp Questions (score: 1): Author: hbrown@voicenet.com (Harry Brown); Date: Sat, 23 Sep 2000 15:36:26 -0400; I recently got an L7 Amp with a bad 3-500Z. The tube plate had shifted and shorted to the grid. This caused the RF choke that Drake uses in the grid to ground circuit to go up in smoke. Does anyone k; /archives//html/Amps/2000-09/msg00959.html (8,108 bytes)
5. [AMPS] Book recommendation? (score: 1): Author: hbrown@voicenet.com (Harry Brown); Date: Tue, 26 Sep 2000 09:46:23 -0400; Single Sideband Systems & Circuits is still available as a revision to the origional book by Crestone Technical Books. Here is what they say on their web page: HF Radio Systems & Circuits William E.; /archives//html/Amps/2000-09/msg01026.html (10,234 bytes)
6. SV: [AMPS] Linearizing Linears, feedback or feedforward (score: 1): Author: hbrown@voicenet.com (Harry Brown); Date: Tue, 26 Sep 2000 13:04:16 -0400; The Harvey Wells Bandmaster used an 807 (or a 1625 - memory fails me) on 144 MHz. This was back in the 50's. I beleive that the rig used the 1625 as a tripler. Not germain to the subject, but it does; /archives//html/Amps/2000-09/msg01056.html (11,523 bytes)
7. [AMPS] AL-80B Amps (score: 1): Author: hbrown@voicenet.com (Harry Brown); Date: Wed, 27 Sep 2000 11:43:27 -0400; Joe, I think that you will find that this a common practice at least 20 years ago. I have aa Drake L7 amp and a Heath SB220 and they both have HV on when you turn on the AC. 73, Harry, W3IIT Microwav; /archives//html/Amps/2000-09/msg01100.html (9,456 bytes)
8. SV: [AMPS] Linearizing Linears, feedback or feedforward (score: 1): Author: hbrown@voicenet.com (Harry Brown); Date: Wed, 27 Sep 2000 11:58:28 -0400; You guys have to remember that this was not a vhf transmitter. It covered all the way from 80 meters to 2 meters. Quite a challenge, especially at that time. 73, Harry, W3IIT Microwave Update/Hamaram; /archives//html/Amps/2000-09/msg01103.html (10,257 bytes)
9. [AMPS] Can anyone Identify an Amplifier part? (score: 1): Author: hbrown@voicenet.com (Harry Brown); Date: Mon, 03 Apr 2000 14:04:02 -0400; They look like flat mica matching capicators to me. Check the Motorola RF Devices manual and you will see them in a lot of their test circuits. They typically put two in parallel to reduce the induct; /archives//html/Amps/2000-04/msg00016.html (8,736 bytes)
10. [AMPS] Need Heathkit SB200 schematic (score: 1): Author: hbrown@voicenet.com (Harry Brown); Date: Wed, 02 Feb 2000 08:07:37 -0500; Eric, You can get the SB200 schematic at http://bama.sbc.edu/heath.htm 73, Harry, W3IIT problems -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Administrative; /archives//html/Amps/2000-02/msg00008.html (8,445 bytes)
11. [AMPS] Cavity Amp designs for 432 Mhz and 1200 Mhz?? (score: 1): Author: hbrown@voicenet.com (Harry Brown); Date: Fri, 18 Feb 2000 09:10:08 -0500; Check the following sites: A 144MHz and 432MHz GS35b High Power Amplifier http://www.qsl.net/dl4mea/2g35.htm OK1KIR's 23cm Power Amplifier with a GI7b http://www.qsl.net/dl4mea/23kir/23kir.htm A 1296; /archives//html/Amps/2000-02/msg00319.html (9,794 bytes)
12. [AMPS] looking for article rf design feb'89 (score: 1): Author: hbrown@voicenet.com (Harry Brown); Date: Mon, 21 Feb 2000 16:49:23 -0500; The application note is AR313 and it appears in the Application Note volume that Motorola used to have along with the volume of data sheets. Communications Concepts, Inc. has at least portions of the; /archives//html/Amps/2000-02/msg00445.html (8,581 bytes)
13. [AMPS] 4CX1000 (score: 1): Author: hbrown@voicenet.com (Harry Brown); Date: Mon, 10 Jan 2000 03:50:16 -0500; Lu, You can find the complete data sheet in Acrobat format at http://www.medphys.ucl.ac.uk/~davek/ham/data/4cx1000a.pdf It's in the web page of G8WRB. He has several other tube data sheets on his web; /archives//html/Amps/2000-01/msg00215.html (8,151 bytes)
14. [AMPS] parts (score: 1): Author: hbrown@voicenet.com (Harry Brown); Date: Fri, 21 Jan 2000 09:06:10 -0500; Small Parts, Inc. has right angle gears. It's not a right angle assembly, just the two gears. In catalog 18W, they list Part No. O-GBM-4815 for $13.70. They are made of brass and have an inside diame; /archives//html/Amps/2000-01/msg00456.html (9,365 bytes)
15. [AMPS] AM-6155/GRT-22 (score: 1): Author: hbrown@voicenet.com (Harry Brown); Date: Fri, 31 Dec 1999 15:24:09 -0500; George, For info on converting them to 144, 222, and 432 MHz go to: http://www.geocities.com/CapeCanaveral/4379/ Also see: http://www.umecut.maine.edu/~baack/AM6155/ For more detailed info on the 432; /archives//html/Amps/1999-12/msg00438.html (8,068 bytes)
16. [AMPS] Whither the 807? (score: 1): Author: hbrown@voicenet.com (Harry Brown); Date: Mon, 01 Nov 1999 11:18:18 -0500; You definitely did not originate the usage of 807. It was in common use at least shortly after I was first licensed in 1954. 73, Harry, W3IIT <center>Visit the Mt. Airy VHF Radio Club at: <underline>; /archives//html/Amps/1999-11/msg00033.html (10,003 bytes)
17. [AMPS] Tempo 6N2 Amplifier Price (score: 1): Author: hbrown@voicenet.com (Harry Brown); Date: Tue, 02 Nov 1999 14:05:52 -0500; I am helping an estate in coming up with reasonable prices for a Tempo 6N2 Amplifier. I've seen it and the appearance is good and I assume that it is operating OK. Obviously if it's not working OK th; /archives//html/Amps/1999-11/msg00081.html (7,352 bytes)
18. [AMPS] Info please - TRANSCO coaxial relays (score: 1): Author: hbrown@voicenet.com (Harry Brown); Date: Fri, 19 Nov 1999 08:51:22 -0500; Ian, Check the Dow Key Microwave web page for information. Transco is now part of Dow Key. I would expect that they are good to several GHz. Power ratings depend on a lot of factors. You should be ab; /archives//html/Amps/1999-11/msg00410.html (8,445 bytes)
19. [AMPS] 2 tone intermod test (score: 1): Author: hbrown@voicenet.com (Harry Brown); Date: Wed, 24 Nov 1999 15:43:48 -0500; John, I have not been paying much attention to this discussion but I did have this thought about generating and measurment of two tone using a computer with a sound card. There are a lot of people us; /archives//html/Amps/1999-11/msg00467.html (18,590 bytes)
20. [AMPS] More Relevant SWR FINAL EXAM (score: 1): Author: hbrown@voicenet.com (Harry Brown); Date: Mon, 11 Oct 1999 23:07:40 -0400; An isolator is a very common rf device in the uhf and microwave business. It is a circulator with one terminal that has a 50 ohm load (you frequently= can not see the load but it's in there). It has; /archives//html/Amps/1999-10/msg00393.html (13,440 bytes)

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