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Total 654 documents matching your query.

301. Re: [Amps] 2m W6PO input T network tuning. (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Fri, 27 Apr 2007 17:34:55 -0400
Check your MFJ-259B on a good dummy load. I just got done checking some loads with mine. I thought I had a bad load but found that the MFJ is only good to around 60 MHz and then it starts showing swr
/archives//html/Amps/2007-04/msg00346.html (10,016 bytes)

302. [Amps] Bird wattmeter (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Sun, 6 May 2007 11:58:55 -0400
Has anyone measured the current thru the meter movement on the bird 43 wattmeter? It is a 30 microamp full scale, so it says on the meter face. I have two very old ones that read low on power. I chec
/archives//html/Amps/2007-05/msg00042.html (8,521 bytes)

303. Re: [Amps] Bird wattmeter (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Mon, 7 May 2007 16:42:26 -0400
Hi Peter, I saw somewhere that the meter resistance is supposed to be 1400 ohms. The ones I have measure 1399, 1406 and 1393 ohms. The 1399 ohm meter reads about 10% low with 30 microamps thru it. Th
/archives//html/Amps/2007-05/msg00063.html (9,087 bytes)

304. Re: [Amps] Bird wattmeter (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Mon, 7 May 2007 16:58:24 -0400
While I appreciate your input, let's be sure we are all on the same page here. Just because a meter has a digital readout dial doesn't make it any more accurate than a regular analogue type meter. Al
/archives//html/Amps/2007-05/msg00064.html (12,240 bytes)

305. Re: [Amps] Bird wattmeter (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Mon, 7 May 2007 17:02:26 -0400
The one 43 meter movement that I opened up had a 200 ohm resistor in series with the movement. That particular meter reads way low, 20 to 30% low and doesn't seem to have a sticking problem. It was r
/archives//html/Amps/2007-05/msg00065.html (9,645 bytes)

306. Re: [Amps] Bird wattmeter (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Mon, 7 May 2007 17:41:36 -0400
Hi Tom, In this case with the bird 43 meter all of the meter movements are 30 microamp movements and I would guess that all of the slugs are designed to put out 30 microamps at full scale into the st
/archives//html/Amps/2007-05/msg00070.html (13,752 bytes)

307. Re: [Amps] Power factor and choke vs resonant-choke input supplies (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Thu, 10 May 2007 23:26:10 -0400
That is backwards. A choke without a gap will swing as the core saturates early. Most normal chokes do have a gap to keep the core from saturating and do not swing. You don't want a swinging choke fo
/archives//html/Amps/2007-05/msg00112.html (14,794 bytes)

308. Re: [Amps] Transformer question (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Sun, 8 Jul 2007 20:46:46 -0500
Before Carl goes out and looks at his stove or dryer and comes back and tells you that they only have 3 prong plugs on them; The old NEC DID allow a few dedicated circuits like dryers and stoves to h
/archives//html/Amps/2007-07/msg00099.html (16,447 bytes)

309. [Amps] Wanted Astron RS-20 transformer (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Mon, 9 Jul 2007 17:41:07 -0500
Anyone have an Astron rs-20 power supply that is dead with a good transformer? I am in need of a transformer for one. Thanks Gary K4FMX _______________________________________________ Amps mailing li
/archives//html/Amps/2007-07/msg00128.html (6,539 bytes)

310. Re: [Amps] Transformer question (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Mon, 9 Jul 2007 20:39:13 -0500
I just bought one of those 50A sockets for my welder last year from home depot. Sold as a range outlet. They still had the 3 wire cords for the range there too. It is my understanding that the 3 wire
/archives//html/Amps/2007-07/msg00133.html (12,031 bytes)

311. Re: [Amps] suppressors (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Fri, 13 Jul 2007 13:23:12 -0500
Here is a link to the N7WS test report on the suppressors. Be sure to look at both graphs. http://www.k6mhe.com/n7ws/supp-1a.htm 73 Gary K4FMX _______________________________________________ Amps mai
/archives//html/Amps/2007-07/msg00213.html (7,479 bytes)

312. [Amps] Drake amplifier (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Mon, 23 Jul 2007 11:21:07 -0500
I have a drake L7 amp. How much power out do you typically get from a drake L4 or L7 amp? I have 95 watts drive and get just short of 1100 watts on 40 meters. The amp's wattmeter and a bird wattmeter
/archives//html/Amps/2007-07/msg00370.html (7,214 bytes)

313. Re: [Amps] Drake amplifier (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Mon, 23 Jul 2007 18:51:00 -0500
Back then I think very few understood what PEP was. Still today many don't. In the 1962 (16th edition) Bill Orr radio handbook they have an 813 amplifier project article. It is described as providing
/archives//html/Amps/2007-07/msg00389.html (18,589 bytes)

314. Re: [Amps] Grounding the grids (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Tue, 24 Jul 2007 12:09:58 -0500
Why do you suppose that Collins put those little 47 ohm resistors in each grid on the 30L1 amplifier? 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.c
/archives//html/Amps/2007-07/msg00405.html (14,870 bytes)

315. Re: [Amps] Looking to purchase a good 6 meter amplifier (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Mon, 30 Jul 2007 15:12:11 -0500
Actually they are pretty close in their specs. If you figure that the amp runs 60% efficiency on SSB and 30% carrier efficiency on AM then things work out ok. 1000 watts carrier INPUT should give aro
/archives//html/Amps/2007-07/msg00526.html (10,516 bytes)

316. Re: [Amps] Looking to purchase a good 6 meter amplifier (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Mon, 30 Jul 2007 16:20:14 -0500
To just handle 100% modulation peaks on AM: It doesn't matter what the amplifier efficiency is. The carrier efficiency for good linear AM, carrier efficiency will be exactly 1/2 of the PEP efficienc
/archives//html/Amps/2007-07/msg00532.html (10,033 bytes)

317. Re: [Amps] SELL: Heat Dissipating 8877 HV Plate Caps (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Thu, 23 Aug 2007 21:21:31 -0500
You're kidding, right? 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2007-08/msg00155.html (8,210 bytes)

318. Re: [Amps] Heat Dissapating 8877 HV Plate Caps (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Fri, 24 Aug 2007 21:55:54 -0500
To each his own. But from my point of view if there was to be anything gained the tube manufacturer would have put fins on that part of the tube. I would also guess that they would have had the fins
/archives//html/Amps/2007-08/msg00168.html (8,029 bytes)

319. Re: [Amps]crossmodulation in PA ? Thanks for all good &Acirc;?advice (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Fri, 7 Sep 2007 18:17:42 -0500
I don't quite see where you get "tens or hundreds of thousands of pounds of pressure" on joint bolts on a typical ham tower? The towers are not that heavy. Joints can easily move especially on smalle
/archives//html/Amps/2007-09/msg00093.html (12,016 bytes)

320. Re: [Amps]crossmodulation in PA ? Thanks for all good &Acirc;?advice (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Fri, 7 Sep 2007 18:26:09 -0500
Lightning is not indifferent to less than perfect joints. A small amount of resistance in a joint can allow a large voltage rise across the joint with the high current of lightning flowing thru it. T
/archives//html/Amps/2007-09/msg00094.html (9,996 bytes)

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