Search String: Display: Description: Sort:

Results:

References: [ +from:lists@subich.com: 246 ]

Total 246 documents matching your query.

221. Re: [Amps] re interfacing IC-706 to alpha 9500 (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Wed, 13 Nov 2019 08:44:36 -0500
The IC-706 is one of those transceivers that produce RF *AFTER* the HSEND line is released. You will need a timing circuit to hold the PTT to your amplifier closed for 5-10ms after HSEND goes high.
/archives//html/Amps/2019-11/msg00068.html (8,038 bytes)

222. Re: [Amps] K3 Drive Levels and the SPE 1.3K-FA (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Thu, 21 Nov 2019 11:25:38 -0500
It would be more appropriate if SPE shipped their amplifiers to the US with the proper attenuator in place. That way one would be running the K3/K3s at 30 Watts in the first place. 73, ... Joe, W4TV
/archives//html/Amps/2019-11/msg00081.html (9,133 bytes)

223. Re: [Amps] anyone build an amplifier use 6T51 glass buble? (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Sun, 12 Jan 2020 10:05:13 -0500
I worry about it ... 800 W plate dissipation is marginal for 100% duty cycle modes like RTTY at 1500 W output. The specification sheet lists only oscillator operation (e.g. industrial heating, etc.)
/archives//html/Amps/2020-01/msg00019.html (8,328 bytes)

224. Re: [Amps] History of Grounded Grid Amplfiers (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Sat, 12 Dec 2020 23:08:55 -0500
I don't remember if AM transmitters were this way or not. The RCA BTA-1R out in my garage certainly has the plate current meter recessed (behind glass). Schematic shows late current meter in the B+
/archives//html/Amps/2020-12/msg00012.html (21,410 bytes)

225. Re: [Amps] Henry RF generators (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Tue, 15 Dec 2020 19:40:24 -0500
Heath Robinson is the British Rube Goldberg (or vice versa). <https://en.wikipedia.org/wiki/W._Heath_Robinson> 73, ... Joe, W4TV Who is Heath Robinson? Famous kit maker? Inquiring minds want to know.
/archives//html/Amps/2020-12/msg00036.html (8,861 bytes)

226. Re: [Amps] W8ZR Autotune Amplifier Progress Report (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Wed, 23 Dec 2020 12:43:06 -0500
Much better ways are available. N1MM, for example, puts a lot of relevant information out via UDP, and the OTRSP (Open Two Radio Support Protocol) is also available for serial comms or USB, via USB-t
/archives//html/Amps/2020-12/msg00060.html (18,060 bytes)

227. Re: [Amps] Clipperton L - GI-7B (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Sat, 13 Feb 2021 14:03:03 -0500
100 watts pep out. The ANAN 7000 / 8000 is a lousy -30 db pep (IMD3 ) with pure signal disconnected. On most of these SS xcvrs , when power output is reduced, the IMD drops like a rock. A TS-850 is -
/archives//html/Amps/2021-02/msg00017.html (10,387 bytes)

228. Re: [Amps] Distilled water in a dummy load ? (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Sat, 13 Feb 2021 14:17:32 -0500
For the amount of brief testing I do, and sometimes with low duty cycles, sometimes high duty cycles, distilled water just might be easier to work with vs xfmr oil. The issue would be time/duty cycle
/archives//html/Amps/2021-02/msg00018.html (9,132 bytes)

229. Re: [Amps] Water cooling. Not dummy load. (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Thu, 25 Feb 2021 16:33:12 -0500
If I were to homebrew something, I'd likely copy what they did. It was compact, efficient and very quiet. You may be able to get some ideas but there are significant differences between water and va
/archives//html/Amps/2021-02/msg00044.html (9,436 bytes)

230. Re: [Amps] Swan Mark 1 on 160 meters (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Wed, 30 Jun 2021 16:35:11 -0400
How does a torrid used on 160/80 meters get hot on 10 meters if its Is *only* the toroid for 160/80 shorted out (bypassed) or is all of the unused inductor (15-160) shorted? If the latter and the 10
/archives//html/Amps/2021-06/msg00035.html (8,915 bytes)

231. Re: [Amps] Amp With A Roller Inductor? (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Mon, 13 Sep 2021 18:05:42 -0400
Depends on whether the amplifier has a band switch which selects fixed "Tune" capacitors for each band or a continuously variable "Tune" cap. In the former case, one uses the inductor the same way o
/archives//html/Amps/2021-09/msg00010.html (8,260 bytes)

232. Re: [Amps] Need Smarter Than I Am Help. (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Fri, 8 Oct 2021 11:45:18 -0400
<http://www.arrl.org/files/file/QEX_Next_Issue/2015/Sep-Oct_2015/Kaune.pdf> 73, ... Joe, W4TV Many here, and many other places, have helped me both on these E-Mail lists as well as directly. I am ext
/archives//html/Amps/2021-10/msg00001.html (12,848 bytes)

233. Re: [Amps] MLA-2500 Tube Conversion (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Mon, 11 Oct 2021 23:21:03 -0400
I'd bet on a 5/64" Allen but it's been 30+ years since I had my hands on an MLA-2500 so it could just as well have been 1/16"or 3/32" but nothing larger than that. 73, ... Joe, W4TV Kim N5OP "People
/archives//html/Amps/2021-10/msg00051.html (11,216 bytes)

234. Re: [Amps] Alpha 76PA Conversion - Drive Issue (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Thu, 2 Dec 2021 17:49:59 -0500
From memory it has 2500V max. and gives operating conditions for 1300W rf output. Dated March 1983 (Class AB2, Cathode Driven, PEP conditions). Plate Voltage: 2500 V. DC Plate current 600 mA (maximum
/archives//html/Amps/2021-12/msg00023.html (9,975 bytes)

235. Re: [Amps] Centrifugal Blowers (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Thu, 27 Jan 2022 16:02:20 -0500
I put the blower in a sealed box with one side filtered and located in the attic and brought the hose out of the ceiling to my rack mounted rf decks for v/uhf. Be careful with the "remote blowers".
/archives//html/Amps/2022-01/msg00109.html (11,977 bytes)

236. Re: [Amps] B&W PT2500 (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Sat, 27 Aug 2022 09:25:57 -0400
The PT2500 is (I think) 2 x 3-500Z. The gain is already marginal if trying to reach 1500W out with 100W drive. Now, if one were working with ceramic/metal tubes or solid state devices that reach 1500
/archives//html/Amps/2022-08/msg00043.html (9,817 bytes)

237. Re: [Amps] 10 kw CCS on 6M (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Mon, 12 Sep 2022 19:49:33 -0400
So, where does that drive power go while the driver(s) are being Drive power is relatively low and typically dissipated in the grid circuit of the succeeding stage. For example, the BTR1 (pair of 4-4
/archives//html/Amps/2022-09/msg00018.html (9,970 bytes)

238. Re: [Amps] transformer identification (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Mon, 14 Nov 2022 17:32:19 -0500
Did you try to contact Triad directly? <https://info.triadmagnetics.com/lp-contact-us> I don't see anything on their web site that matches your description so it's probably long discontinued. <https:
/archives//html/Amps/2022-11/msg00018.html (8,043 bytes)

239. Re: [Amps] Requesting opinions on a Drake L-4b's tubes (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Fri, 23 Dec 2022 16:40:55 -0500
Of course, the finals in the Amp are push pull configuration -2k PEP & 1K CW input watts. That is incorrect. The L4B (and L7) are parallel 3-500Z designs. If your "new" tubes come from Drake, they ar
/archives//html/Amps/2022-12/msg00097.html (8,787 bytes)

240. Re: [Amps] World's worst coax connectors (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Thu, 20 Apr 2023 13:44:15 -0400
Not to be outdone, the television industry has responded with its own bad standard, the type F coax "connector," which uses the unsupported inner wire of the coax as the pin of the male plug, and a
/archives//html/Amps/2023-04/msg00028.html (9,148 bytes)

Current List: 221 - 240
Page: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13]
This search system is powered by Namazu