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1. [Amps] MRF174 at 50 MHz (score: 1)
Author: dpease@adams.net
Date: Tue, 22 Mar 2005 11:37:19 -0600
Has anyone had any experience with using the MRF174 at 50 MHz? I would like to build a 100 watt linear amp for 6 meters and have a few of these parts in my collection. Danny NG9R dpease@adams.net ...
/archives//html/Amps/2005-03/msg00488.html (6,572 bytes)

2. Re: [Amps] Amps Digest, Vol 43, Issue 43 (score: 1)
Author: dpease@adams.net
Date: Wed, 12 Jul 2006 07:11:40 -0500
Dick, the company I work for repairs a 75 MHz 100 watt FM transmitter that uses the SD1460 in the 100 watt final amp. They have been used for 20+ years and are a pretty rugged, cost effective part.
/archives//html/Amps/2006-07/msg00344.html (7,870 bytes)

3. [Amps] MOSFET biasing (score: 1)
Author: "Danny Pease" <dpease@adams.net>
Date: Tue, 25 Jul 2006 18:35:46 -0500
Anyone have any experience with biasing MOSFET's for linear service, specifically the MRF174? I have a 144 MHz 600 watt amp that uses 3 boards of pairs in push-pull. The existing bias arrangement swi
/archives//html/Amps/2006-07/msg01133.html (7,103 bytes)

4. [Amps] high voltage fuses (score: 1)
Author: "Danny Pease" <dpease@adams.net>
Date: Tue, 9 Sep 2008 08:40:12 -0500
After reading a few of the comments about high voltage fuses, we may need a reminder about voltage ratings. Using a 3AG glass fuse in a high voltage lead is a very cheap and dirty method, but the 3AG
/archives//html/Amps/2008-09/msg00074.html (7,230 bytes)

5. [Amps] L4 amp question (score: 1)
Author: Danny Pease <dpease@adams.net>
Date: Wed, 29 Oct 2008 20:57:03 -0500
I am in the process of repairing a Drake L4 amp that suffered some lightning damage. The only physical damage was a .001 1400 VDC bypass cap on one leg of the 230 vac line inside the RF deck. The onl
/archives//html/Amps/2008-10/msg00137.html (7,938 bytes)

6. Re: [Amps] L4 amp question (score: 1)
Author: Danny Pease <dpease@adams.net>
Date: Wed, 29 Oct 2008 21:54:24 -0500
This was into a dummy load. NG9R _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2008-10/msg00139.html (7,623 bytes)

7. Re: [Amps] L4 amp question (score: 1)
Author: "Danny Pease" <dpease@adams.net>
Date: Thu, 30 Oct 2008 09:27:16 -0500
Idle current is a little over 100 mA, relay does function and has continuity through all contacts. NG9R Do you even have idle current? Does the relay function? Carl KM1H <http://pr.atwola.com/promocl
/archives//html/Amps/2008-10/msg00142.html (9,805 bytes)

8. Re: [Amps] L4 amp question (score: 1)
Author: Danny Pease <dpease@adams.net>
Date: Thu, 30 Oct 2008 10:41:06 -0500
That is exactly what it acts like. I hope that is all it is. I have it apart right now to finish cleaning it (it is owned by a smoker and from the looks of the dirt and dust it has never been taken a
/archives//html/Amps/2008-10/msg00144.html (12,291 bytes)

9. [Amps] Loading issue (score: 1)
Author: "Danny Pease" <dpease@adams.net>
Date: Thu, 20 Nov 2008 11:50:26 -0600
Message: 1 Date: Thu, 20 Nov 2008 07:10:07 -0800 (PST) From: Lee Buller <k0wa@swbell.net> Subject: [Amps] Strange Loading Issue To: amps@contesting.com Message-ID: <937961.53563.qm@web81304.mail.mud.
/archives//html/Amps/2008-11/msg00197.html (8,356 bytes)

10. [Amps] tune capacitor voltage ratings (score: 1)
Author: "Danny Pease" <dpease@adams.net>
Date: Mon, 2 Feb 2009 10:39:33 -0600
What would be a safe voltage rating for a plate tune cap in an amplifier running 4000 VDC on the plate? Also, how much of an effect would higher VSWR on the antenna have on the voltage seen on the tu
/archives//html/Amps/2009-02/msg00025.html (6,583 bytes)

11. [Amps] pulse tuning vs two-tone (score: 1)
Author: "Danny Pease" <dpease@adams.net>
Date: Sat, 30 Jan 2010 08:38:24 -0600
I have used single tone and two tone audio to tune amps in the past. I would think that is superior to pulse or full carrier for SSB. Since I have a sound card interface connected to the radio anyway
/archives//html/Amps/2010-01/msg00506.html (6,691 bytes)

12. Re: [Amps] shorted filter caps (score: 1)
Author: "Danny Pease" <dpease@adams.net>
Date: Thu, 11 Feb 2010 17:04:41 -0600
I have experienced several new electrolytics that shorted and besides the mess, they have a nasty fishy smell! NG9R I have seen shorted oil filled capacitors and boy do they make a mess when they puk
/archives//html/Amps/2010-02/msg00324.html (7,827 bytes)

13. [Amps] shorted filter cap (score: 1)
Author: "Danny Pease" <dpease@adams.net>
Date: Fri, 12 Feb 2010 09:01:58 -0600
Shorted is relative. If you can measure low enough, there is no such thing as a short. A piece of wire is usually considered a short, but we all know it has some values of resistance. A few ohms comp
/archives//html/Amps/2010-02/msg00344.html (7,903 bytes)

14. [Amps] antek web site (score: 1)
Author: "Danny Pease" <dpease@adams.net>
Date: Fri, 23 Apr 2010 15:41:04 -0500
They have a website, you can look for yourselves. www.antekinc.com It appears antek is short for Ango Technology Corp. NG9R Antek != Antec. The later is a respected name in PC power supplies. Honestl
/archives//html/Amps/2010-04/msg00624.html (7,412 bytes)

15. Re: [Amps] Salt water load (score: 1)
Author: "Danny Pease" <dpease@adams.net>
Date: Fri, 16 Jul 2010 13:38:06 -0500
A shielded load it is not, probably pretty easy to work quite a few stations with it. Maybe a short stealth antenna design is possible with it? Use some 2 inch PCV and caps for a container and severa
/archives//html/Amps/2010-07/msg00181.html (7,194 bytes)

16. Re: [Amps] Clipperton L suggestion (score: 1)
Author: "Danny Pease" <dpease@adams.net>
Date: Sun, 31 Oct 2010 08:10:00 -0500
Larry, did you confirm continuity across the T/R relay contacts? When I had a Clipperton, that was an ongoing issue. NG9R Message: 2 Date: Sat, 30 Oct 2010 23:34:20 -0400 From: "Larry" <lknain@nc.rr.
/archives//html/Amps/2010-10/msg00482.html (8,497 bytes)

17. [Amps] plate choke location (score: 1)
Author: "Danny Pease" <dpease@adams.net>
Date: Thu, 5 Jan 2012 22:07:33 -0600
What is the drawback to putting the plate choke at the low impedance end of the tank circuit? If the blocking cap was after the load cap, the load cap would need to be rated for about the same voltag
/archives//html/Amps/2012-01/msg00081.html (6,797 bytes)

18. [Amps] ferroresonant power supplies (score: 1)
Author: "Danny Pease" <dpease@adams.net>
Date: Thu, 10 May 2012 16:56:35 -0500
Since ferroresonant power supplies were mentioned, I have to ask the question, why aren't they used for high voltage supplies? My experience with them has been at a lower voltage, 26 VDC. Is there a
/archives//html/Amps/2012-05/msg00255.html (7,484 bytes)

19. Re: [Amps] N Connector (score: 1)
Author: "Danny Pease" <dpease@adams.net>
Date: Wed, 18 Dec 2013 13:10:14 -0600
7 or 8 years back I bought several from Pasternack, they worked well but have the same problem as most other N connectors, it can be tough to solder the center conductor without getting too much sold
/archives//html/Amps/2013-12/msg00131.html (9,211 bytes)

20. Re: [Amps] N Connector (score: 1)
Author: "Danny Pease" <dpease@adams.net>
Date: Thu, 19 Dec 2013 11:40:52 -0600
Several years back, we were told by Suhner that the hole in the side of the center pin was not there to solder the pin to the center conductor but to inspect the solder joint. We never did get an ans
/archives//html/Amps/2013-12/msg00139.html (10,391 bytes)

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