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161. Re: [TenTec] Off Topic - Millen Grid Dip Meter Manual needed Model 90652 (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 04 Nov 2008 15:46:47 -0600
http://bama.sbc.edu/ is working for me right now. They are also mirrored at: http://bama.edebris.com/ The uses of the GDO will be the same for the 90651 and 90652. As will the applications of the Hea
/archives//html/TenTec/2008-11/msg00060.html (8,712 bytes)

162. Re: [TenTec] Off Topic - Millen Grid Dip Meter Manual needed (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Wed, 05 Nov 2008 17:10:59 -0600
Schematic only. Says the operation IS the same as the 90651. I recall a QST article about how tough it was to make the solid state dipper function like the tube dipper. Still may by Caywood, but ther
/archives//html/TenTec/2008-11/msg00072.html (8,504 bytes)

163. Re: [TenTec] Ten Tec 962 Power Supply Problem (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Wed, 05 Nov 2008 19:21:28 -0600
Could have been a pass transistor shorted, then the crowbar tripped to protect the radio which shorted the rest of the supply and the rectifier was faster than the fuse. An MDL fuse has time delay, o
/archives//html/TenTec/2008-11/msg00075.html (9,187 bytes)

164. Re: [TenTec] Off Topic - Millen Grid Dip Meter Manual needed (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Wed, 05 Nov 2008 20:09:26 -0600
The manual for the 90651 available at: http://bama.edebris.com/manuals/millen/90651/ has 11 pages plus 4 pages of parts. Looks to me as if its already been scanned. Available as one 2 MB .pdf or indi
/archives//html/TenTec/2008-11/msg00076.html (8,442 bytes)

165. Re: [TenTec] Argosy II 525D Problems (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 09 Nov 2008 20:50:35 -0600
Sounds to me like the driver or PA transistor(s) have gone bad or their bias circuit is driving them too hard. Typically the PA transistors have power all the time, but the bias circuit should be tur
/archives//html/TenTec/2008-11/msg00100.html (7,771 bytes)

166. Re: [TenTec] Operating AM with the Centurion amplifier (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 05 Oct 2008 10:44:34 -0600
Neglecting thermal problems, you can only run a linear on AM with a carrier level equal to 1/4 the peak output because on modulation peaks AM has 4 times the power of its carrier. The DX-60B will con
/archives//html/TenTec/2008-10/msg00038.html (8,796 bytes)

167. Re: [TenTec] Replacing the speaker in a Delta II/Argonaut II (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 06 Oct 2008 15:02:53 -0600
And your cat may be leaving for other territories because when that series RC isn't there the amplifier will oscillate at ultrasonic frequencies. Its a parasitic suppressor. 73, Jerry, K0CQ
/archives//html/TenTec/2008-10/msg00047.html (9,696 bytes)

168. Re: [TenTec] OT (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Wed, 08 Oct 2008 20:58:59 -0600
I've been using ARRL log books for 53 years. I'm about to need a new one and I've decided to brew my own with a couple more columns. I like the wire spiral binding (which a local copy center can do f
/archives//html/TenTec/2008-10/msg00083.html (9,576 bytes)

169. Re: [TenTec] OT (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Wed, 08 Oct 2008 21:11:05 -0600
Yah, dat's nice, until the computer croaks. My 53 year old paper logs are still as readable as they day they were made. My 30 year old computer media (8" floppy disks) probably isn't readable though
/archives//html/TenTec/2008-10/msg00085.html (10,532 bytes)

170. Re: [TenTec] MRF454 (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sat, 11 Oct 2008 17:25:09 -0600
Better prices at RF Parts: http://www.rfparts.com/transistors_MRF-TP.html#MRF401 and http://www.rfparts.com/pdf_docs/SRF3749.pdf And what does TenTec want for those parts? Probably less than RF Parts
/archives//html/TenTec/2008-10/msg00124.html (7,580 bytes)

171. Re: [TenTec] OMNI V (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Wed, 15 Oct 2008 07:35:17 -0600
In some rigs, the same jack is used for the paddle of an internal keyer and for the straight key. A menu item or switch selects which is used. Sometimes the keyer won't ignore the ring contact ground
/archives//html/TenTec/2008-10/msg00152.html (8,206 bytes)

172. Re: [TenTec] Centaur tuning problems (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 19 Oct 2008 20:29:50 -0600
Add to that, input and output band switches in the amp on the same band. Often there is a chain or belt between them that can have failed. Or a shaft coupler can have come loose. 73, Jerry, K0CQ
/archives//html/TenTec/2008-10/msg00182.html (8,698 bytes)

173. Re: [TenTec] Mini Lamp Needed (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 19 Oct 2008 20:45:55 -0600
Another check is the color of the bead inside the lamp. I think the 47 which is 6.3 volt 150 ma T3-1/4 bayonet base has a blue bead. Made by many makers in the past CM is just Chicago Miniature's pre
/archives//html/TenTec/2008-10/msg00183.html (9,909 bytes)

174. Re: [TenTec] Mini Lamp Needed (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 20 Oct 2008 16:05:24 -0600
Yes, I checked my lamp drawer. 47 is white bead, its a 44 (6.3 volts 250 ma) that is blue bead. Both are common and ordinary and in the past used almost universally at 6.3 volts, though the 47 was mo
/archives//html/TenTec/2008-10/msg00185.html (9,390 bytes)

175. Re: [TenTec] Mini Lamp Needed (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 21 Oct 2008 10:46:44 -0600
And much lower light level. The 47 would be a very likely candidate as it was used for literally millions of AC/DC radios and almost every tube radio. Since what is there is that size and has the whi
/archives//html/TenTec/2008-10/msg00188.html (12,168 bytes)

176. Re: [TenTec] Mini Lamp Needed (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Wed, 22 Oct 2008 10:35:51 -0600
Not usually. Its certain the 44 dissipates more heat. All tungsten lamps put out mostly heat with a little light. So be it. Like said before at least twice, 51 or 1893 or 1891 running at half voltage
/archives//html/TenTec/2008-10/msg00194.html (9,914 bytes)

177. Re: [TenTec] Mini Lamp Needed (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Thu, 23 Oct 2008 18:58:55 -0600
I wouldn't. The lamps for the 821A-1 originally were much smaller, type 327 with resistors lasted pretty good, type 387 lasted much better. Miniature flange base, 28 volts 40 ma for both. The 1873 an
/archives//html/TenTec/2008-10/msg00206.html (9,094 bytes)

178. Re: [TenTec] Mini Lamp Needed (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Thu, 23 Oct 2008 20:00:06 -0600
Considering that we gave VOA the transmitters for purchase parts cost to get into that new line of transmitters with more than 50 KW out (The 821A-1 did 250 KW carrier plate modulated AM), the hammer
/archives//html/TenTec/2008-10/msg00208.html (8,966 bytes)

179. Re: [TenTec] info (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 24 Oct 2008 17:03:17 -0600
It makes practically no difference on HF unless you work a mixed mode contact. Mixed mode contacts are halfway common on VHF, but uncommon on HF. Otherwise it depends on which way you prefer signals
/archives//html/TenTec/2008-10/msg00214.html (8,731 bytes)

180. Re: [TenTec] Omni 546-C SSB TX issue (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Thu, 04 Sep 2008 13:37:06 -0600
Adjust the pots for minimum carrier at the output in transmit mode with no audio input. Not even a microphone. Could be a trap or simply a signal bandpass. If a trap its adjusted to minimize some unw
/archives//html/TenTec/2008-09/msg00037.html (10,597 bytes)

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