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201. Re: [TenTec] Orion VFO Knobs (score: 1)
Author: Bob McGraw K4TAX <rmcgraw@blomand.net>
Date: Wed, 8 Aug 2018 11:43:55 -0500
As an additional point to support, based on the legal department for my previous employer, there is no statute or law in the US which requires a company to supply support or parts past the original w
/archives//html/TenTec/2018-08/msg00058.html (15,004 bytes)

202. Re: [TenTec] Orion VFO Knobs (score: 1)
Author: Bob McGraw K4TAX <rmcgraw@blomand.net>
Date: Wed, 8 Aug 2018 16:49:19 -0500
Yep, that is what I was doing when performing contract service for Kenwood, Icom and Yaesu and a few other public service products.    Fortunately most was warranty service and the customer was not r
/archives//html/TenTec/2018-08/msg00066.html (12,975 bytes)

203. Re: [TenTec] Orion VFO Knobs (score: 1)
Author: Bob McGraw K4TAX <rmcgraw@blomand.net>
Date: Wed, 8 Aug 2018 19:26:50 -0500
David: I fully agree with your approach and what you have relegated to yourself in order to keep the 2" quad machines and 1" helical machines running.   At the same time, it doesn't appear you are fa
/archives//html/TenTec/2018-08/msg00070.html (15,739 bytes)

204. Re: [TenTec] centurion (score: 1)
Author: Bob McGraw K4TAX <rmcgraw@blomand.net>
Date: Wed, 8 Aug 2018 19:53:12 -0500
Is this idle current with no signal?   If so it is about correct. 73 Bob, K4TAX -- This email has been checked for viruses by AVG. https://www.avg.com _______________________________________________
/archives//html/TenTec/2018-08/msg00074.html (8,228 bytes)

205. Re: [TenTec] centurion (score: 1)
Author: Bob McGraw K4TAX <rmcgraw@blomand.net>
Date: Wed, 8 Aug 2018 20:38:13 -0500
Check the bias supply. Tubes should not show color at idle. Bob, K4TAX Sent from my iPhone
/archives//html/TenTec/2018-08/msg00077.html (9,757 bytes)

206. Re: [TenTec] centurion (score: 1)
Author: Bob McGraw K4TAX <rmcgraw@blomand.net>
Date: Thu, 9 Aug 2018 11:36:13 -0500
GREAT!!!!!  problem resolved.  Easy fix too. 73 Bob, K4TAX There are about two possible reasons a good tube will draw excessive current when it has no drive. 1) The bias is wrong. 2) There is an osci
/archives//html/TenTec/2018-08/msg00089.html (13,949 bytes)

207. Re: [TenTec] 2 cents (score: 1)
Author: Bob McGraw K4TAX <rmcgraw@blomand.net>
Date: Thu, 9 Aug 2018 11:41:44 -0500
Yep, just look at AMAZON.  Although they 2 step many items, many ship from the distribution centers. Years ago many Sony VTR, camera and editor parts were warehoused at the Fed-X facility in Memphis.
/archives//html/TenTec/2018-08/msg00090.html (12,536 bytes)

208. Re: [TenTec] centurion (score: 1)
Author: Bob McGraw K4TAX <rmcgraw@blomand.net>
Date: Thu, 9 Aug 2018 22:16:19 -0500
In general the Centurion in Standby mode should show 0 ma plate current and 3100 volts for the high voltage.  In transmit idle mode {no signal}  the plate current should be about 75 ma depending the
/archives//html/TenTec/2018-08/msg00094.html (12,976 bytes)

209. Re: [TenTec] Source for 470 pf doorknob capacitors (score: 1)
Author: Bob McGraw K4TAX <rmcgraw@blomand.net>
Date: Wed, 15 Aug 2018 08:18:51 -0500
Check for those on E-Bay.  Usually Russian made.   I've replaced many of those drifting / heating disk ceramics.    Don't forget to replace the pair of series 50 pf capacitors on the output at the An
/archives//html/TenTec/2018-08/msg00110.html (8,417 bytes)

210. Re: [TenTec] KV read (score: 1)
Author: Bob McGraw K4TAX <rmcgraw@blomand.net>
Date: Wed, 15 Aug 2018 08:56:39 -0500
As found in the manual, page 2-1 under METER, see the following. 2-2.7 METER   This switch is used to select what is being displayed on the built-in illuminated meter.  When in the Ig position it sel
/archives//html/TenTec/2018-08/msg00111.html (8,628 bytes)

211. Re: [TenTec] KV read (score: 1)
Author: Bob McGraw K4TAX <rmcgraw@blomand.net>
Date: Wed, 15 Aug 2018 10:00:41 -0500
One has to interpolate the marking and space between the numbers.  Thus there is 800 volts between the 2.4 and3.2 or 2400 volts and 3200 volts.  Then 1/2 way between the two would be 2400 + 400 or 28
/archives//html/TenTec/2018-08/msg00114.html (10,099 bytes)

212. Re: [TenTec] KV read (score: 1)
Author: Bob McGraw K4TAX <rmcgraw@blomand.net>
Date: Wed, 15 Aug 2018 14:10:10 -0500
I suggest to check the HV multiplier resistors R42, R43, & R44.   Should be 1 megohm each +/-1%.    Also check R41 which is 150K ohms.   The normal HV is 3100 volts no load or standby and 2600 volts
/archives//html/TenTec/2018-08/msg00117.html (9,454 bytes)

213. Re: [TenTec] Centurion 422 amp keying issues (score: 1)
Author: Bob McGraw K4TAX <rmcgraw@blomand.net>
Date: Fri, 17 Aug 2018 15:03:57 -0500
Centurion does as well. Relay hanging up is most likely a component on the QSK board. Bob, K4TAX Sent from my iPhone
/archives//html/TenTec/2018-08/msg00124.html (8,582 bytes)

214. Re: [TenTec] Centurion 422 amp keying issues (score: 1)
Author: Bob McGraw K4TAX <rmcgraw@blomand.net>
Date: Fri, 17 Aug 2018 20:27:43 -0500
Although I've not researched my documentation on the topic, I do recall that one must jumper D2 on the QSK board to assure that the amplifier would key correctly from the Omni VII. As to release of t
/archives//html/TenTec/2018-08/msg00126.html (11,959 bytes)

215. Re: [TenTec] Audio improvements on Argonaut VI (score: 1)
Author: Bob McGraw K4TAX <rmcgraw@blomand.net>
Date: Mon, 20 Aug 2018 07:33:38 -0500
I find the RX audio quality of the Argonaut VI to be exceptional when compared to other like radios.   In comparing it to the Corsair II, you are comparing an analog radio to a digital radio. Yes the
/archives//html/TenTec/2018-08/msg00137.html (10,195 bytes)

216. Re: [TenTec] Audio improvements on Argonaut VI (score: 1)
Author: Bob McGraw K4TAX <rmcgraw@blomand.net>
Date: Mon, 20 Aug 2018 12:09:42 -0500
Paul; Have you heard, observed or measured the artifacts of this receiver? If not, you have no clue as to the minuscule magnitude of the issue. Your generalizing is of little value and grossly mislea
/archives//html/TenTec/2018-08/msg00143.html (11,921 bytes)

217. Re: [TenTec] Audio improvements on Argonaut VI (score: 1)
Author: Bob McGraw K4TAX <rmcgraw@blomand.net>
Date: Mon, 20 Aug 2018 12:37:25 -0500
Fine on your test equipment and work in audio. But have you actually measured the performance of the Tentec Argonaut VI receiver? I have. My audio experience is rather extensive. With 14 years as a r
/archives//html/TenTec/2018-08/msg00146.html (11,500 bytes)

218. Re: [TenTec] Audio improvements on Argonaut VI (score: 1)
Author: Bob McGraw K4TAX <rmcgraw@blomand.net>
Date: Mon, 20 Aug 2018 13:02:33 -0500
Your points are well taken and are correct. I did and have looked at your QRZ site.  Very impressive with all you've done.  Can't take anything away from you for your work. Nice! 73 Bob, K4TAX I woul
/archives//html/TenTec/2018-08/msg00152.html (13,778 bytes)

219. Re: [TenTec] Audio improvements on Argonaut VI (score: 1)
Author: Bob McGraw K4TAX <rmcgraw@blomand.net>
Date: Tue, 21 Aug 2018 08:25:04 -0500
Carlos et & al: If you are finding the headphone audio cleaner than the speaker audio, the audio amp which drives the headphones and speaker is the same device.  This would seem to indicate the audio
/archives//html/TenTec/2018-08/msg00168.html (12,367 bytes)

220. Re: [TenTec] Ten Tec Omni VI Plus (score: 1)
Author: Bob McGraw K4TAX <rmcgraw@blomand.net>
Date: Tue, 21 Aug 2018 12:30:41 -0500
Rich My general suggestion for older radios such as yours is to clean all internal connectors. Apply contact cleaner to a Q-Tip or lint free swab and clean the male pins of each connector. Do this on
/archives//html/TenTec/2018-08/msg00170.html (8,250 bytes)

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