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References: [ +from:w7ry@centurytel.net: 284 ]

Total 284 documents matching your query.

141. Re: [Amps] 200-ohm tank and "un-un" in HF amp design? (score: 1)
Author: Jim W7RY <w7ry@centurytel.net>
Date: Sun, 20 Oct 2013 22:22:51 -0700
See below. 73 Jim W7RY Assuming adequate core/wire sizing and airflow, can anyone think of a solid reason *not* to design a legal-limit HF amp output tank for 200 ohms, then use a 4:1 "un-un" transfo
/archives//html/Amps/2013-10/msg00372.html (12,399 bytes)

142. Re: [Amps] Small mystery (score: 1)
Author: Jim W7RY <w7ry@centurytel.net>
Date: Wed, 30 Oct 2013 07:12:22 -0700
You may need higher voltage AC to supply the -140 VDC grid bias suggested. Can you replace this transformer or increase it's output AC voltage? 73 Jim W7RY On 10/29/2013 12:02 PM, Vic K2VCO wrote: Th
/archives//html/Amps/2013-10/msg00450.html (12,492 bytes)

143. [Amps] W7RY QSK Parts Back on EBay (score: 1)
Author: Jim W7RY <w7ry@centurytel.net>
Date: Fri, 01 Nov 2013 15:52:05 -0700
All of my QSK products (SB-220, SB-200 TL-922 Drake L4-L7 and Ameritron) are back on EBay. You can search on my call to find them. Thanks and 73 Jim W7RY _____________________________________________
/archives//html/Amps/2013-11/msg00010.html (6,499 bytes)

144. Re: [Amps] Measuring IMD (score: 1)
Author: Jim W7RY <w7ry@centurytel.net>
Date: Sun, 03 Nov 2013 06:56:34 -0800
Remember the tune meter position on the Collins 30L-1? 73 Jim W7RY On 11/3/2013 6:31 AM, Karl-Arne Markström wrote: The circuit in the ARRL Handbook was intended to establish the static load-line whe
/archives//html/Amps/2013-11/msg00030.html (12,824 bytes)

145. Re: [Amps] Chinese 15KV 2A rectifier modules? (score: 1)
Author: Jim W7RY <w7ry@centurytel.net>
Date: Wed, 06 Nov 2013 19:56:43 -0800
Get someone to X-ray them and see whats in there. Large or small body diode and how many. 73 Jim W7RY 73, Jim N7CXI Of course, in normal use the current waveform would not be constant, but if they ar
/archives//html/Amps/2013-11/msg00090.html (10,072 bytes)

146. Re: [Amps] [amps] West Coast Handbook (score: 1)
Author: Jim W7RY <w7ry@centurytel.net>
Date: Fri, 08 Nov 2013 08:49:20 -0800
Amazon? 73 Jim W7RY Now to see if I can locate one ?? 73, Dick, W1KSZ There is a 23rd Edition of Radio Handbook by Bill Orr, W6SAI published in 1997. Don K3PRN From: gregory.beat@comcast.net Date: We
/archives//html/Amps/2013-11/msg00145.html (9,438 bytes)

147. Re: [Amps] Question on soft start board location on a SB1000 (score: 1)
Author: Jim W7RY <w7ry@centurytel.net>
Date: Fri, 08 Nov 2013 08:53:57 -0800
I just installed one of my step starts into an SB-1000. I used a 6-32 standoff about 1 inch long. I removed the nut on the screw holding the ground wire from the power cord to the chassis. Then insta
/archives//html/Amps/2013-11/msg00146.html (9,898 bytes)

148. Re: [Amps] Yaesu FT-2000 "TX-INH" Spec? (score: 1)
Author: Jim W7RY <w7ry@centurytel.net>
Date: Fri, 08 Nov 2013 09:08:38 -0800
No need to disable the exciter if it closes the amplifier relay before RF starts flowing. Hook up a dual trace scope to the radio. On channel to the relay puling a 9 volt battery to ground through a
/archives//html/Amps/2013-11/msg00147.html (10,172 bytes)

149. Re: [Amps] Question for the tetrode experts (score: 1)
Author: Jim W7RY <w7ry@centurytel.net>
Date: Fri, 08 Nov 2013 09:11:36 -0800
What band? Are you using padder capacitors on the loading cap? 73 Jim W7RY On 11/7/2013 3:14 PM, Vic K2VCO wrote: I've finally applied full drive to my 4CX1000A amplifier. Here is what I'm seeing: I
/archives//html/Amps/2013-11/msg00148.html (9,072 bytes)

150. Re: [Amps] AL-1500 fan speed switching (score: 1)
Author: Jim W7RY <w7ry@centurytel.net>
Date: Fri, 08 Nov 2013 09:14:20 -0800
The later AL-1500 had a simple piece of plastic tubing glued to the chassis. 73 Jim W7RY I bought my AL-1500 second hand and the guy shipped it with the tube installed. Needless to say, it was a mess
/archives//html/Amps/2013-11/msg00149.html (12,188 bytes)

151. Re: [Amps] Question for the tetrode experts (score: 1)
Author: Jim W7RY <w7ry@centurytel.net>
Date: Fri, 08 Nov 2013 12:52:44 -0800
Tuning is VERY touchy. You really have to have the loading right or the screen current is excessive in either direction. Are the tune and load capacitors too large? Are there vernier dials on the cap
/archives//html/Amps/2013-11/msg00153.html (11,714 bytes)

152. Re: [Amps] Alpha chimneys (score: 1)
Author: Jim W7RY <w7ry@centurytel.net>
Date: Fri, 08 Nov 2013 15:05:19 -0800
Yup! just butt up against the top. 73 Jim W7RY On 11/8/2013 3:02 PM, Vic K2VCO wrote: Can someone tell me how Alpha and others that use silicone rubber chimneys on the tubes deal with the tops of the
/archives//html/Amps/2013-11/msg00164.html (7,513 bytes)

153. [Amps] Autek WM-1 Schematic or Help (score: 1)
Author: Jim W7RY <w7ry@centurytel.net>
Date: Fri, 08 Nov 2013 21:24:12 -0800
I have a problem with an Autek WM1 measring the output of my amplifier. :) Does anyone have a schematic for the Autek WM-1? A Google search found nothing. Mine looks like it has a wireing error. The
/archives//html/Amps/2013-11/msg00168.html (7,713 bytes)

154. [Amps] Autek WM-1 Schematic or Help (score: 1)
Author: Jim W7RY <w7ry@centurytel.net>
Date: Fri, 08 Nov 2013 21:24:24 -0800
I have a problem with an Autek WM1 measring the output of my amplifier. :) Does anyone have a schematic for the Autek WM-1? A Google search found nothing. Mine looks like it has a wiring error. The c
/archives//html/Amps/2013-11/msg00169.html (7,741 bytes)

155. Re: [Amps] Autek WM-1 Schematic or Help (score: 1)
Author: Jim W7RY <w7ry@centurytel.net>
Date: Fri, 08 Nov 2013 21:36:26 -0800
BTW the manual has a bit of a schematic, but the choke is not shown. Thanks 73 Jim W7RY Does anyone have a schematic for the Autek WM-1? A Google search found nothing. Mine looks like it has a wiring
/archives//html/Amps/2013-11/msg00170.html (7,917 bytes)

156. Re: [Amps] Autek WM-1 Schematic or Help (score: 1)
Author: Jim W7RY <w7ry@centurytel.net>
Date: Sun, 10 Nov 2013 17:52:52 -0800
Thanks all for sending pictures and other stuff! Got it all back to working and calibrated. 73 Jim W7RY Thanks 73 Jim W7RY Does anyone have a schematic for the Autek WM-1? A Google search found nothi
/archives//html/Amps/2013-11/msg00226.html (9,227 bytes)

157. Re: [Amps] Best source for Gigavac GH-1 ? (score: 1)
Author: Jim W7RY <w7ry@centurytel.net>
Date: Sun, 10 Nov 2013 21:49:57 -0800
Jim Can you tell me why sequencing is a requirement? I have found that the RF never flows (6 ms after the tranciever control circuts energise)until way after the relays and cathode bias has switched
/archives//html/Amps/2013-11/msg00231.html (9,428 bytes)

158. Re: [Amps] Best source for Gigavac GH-1 ? (score: 1)
Author: Jim W7RY <w7ry@centurytel.net>
Date: Sun, 10 Nov 2013 22:00:01 -0800
Larry's site has a small sample of transceiver measurements that show the amplifier relay close to RF flow start: http://www.w0qe.com/amplifier_timing.html A great resource when you want to think abo
/archives//html/Amps/2013-11/msg00232.html (13,884 bytes)

159. Re: [Amps] Small vertical ceramic slug type trimmer (score: 1)
Author: Jim W7RY <w7ry@centurytel.net>
Date: Sun, 10 Nov 2013 22:14:11 -0800
Lots of them on EBay. Just search for piston capacitor. 73 Jim W7RY Can't seem to find one on all the usual places. Any leads/ideas? Thanks Rick, N6PE == The only difference between a rut and a grave
/archives//html/Amps/2013-11/msg00233.html (7,899 bytes)

160. Re: [Amps] Best source for Gigavac GH-1 ? (score: 1)
Author: Jim W7RY <w7ry@centurytel.net>
Date: Mon, 11 Nov 2013 07:51:13 -0800
I know all of this Paul. I was asking Jim, W8ZR what his compelling reason was for relay sequencing was. Thanks 73 Jim W7RY Sequencing is mostly a non-issue when using recently manufactured transceiv
/archives//html/Amps/2013-11/msg00240.html (10,528 bytes)

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