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341. Re: [TenTec] An Update from Ten Tec (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 30 Nov 2016 12:45:53 -0500
And make it LDMOS with an external, optional 48V supply. LDMOS devices using "bolt-on" machine screw blocks onto the PC board -- no de-soldering when replacing. The buyer can then select a mating TT
/archives//html/TenTec/2016-11/msg00327.html (29,359 bytes)

342. Re: [TenTec] Omni-D relay clicks (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sun, 22 Jan 2017 13:06:03 -0500
A bit more work, but I break the trace from the relay's switching transistor collector and bring it out to the amplifier keying jack. In some cases, I've replaced the switching transistor with a hig
/archives//html/TenTec/2017-01/msg00128.html (8,473 bytes)

343. Re: [TenTec] Warc crystals (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 15 Feb 2017 22:52:03 -0500
Check with the folks at ICM crystals in Oklahoma City. They still maintain a list of crystals for classic rigs. Provide them with the transceiver model number and desired WARC bands of operation. ht
/archives//html/TenTec/2017-02/msg00104.html (8,742 bytes)

344. Re: [TenTec] Audio improvements on Argonaut VI (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 20 Aug 2018 12:41:05 -0400
Unless it masks another problem, then it's a design issue for which I extend no forgiveness. There's no excuse for hiss, noise, or high-distortion levels in any receiver, especially those designed w
/archives//html/TenTec/2018-08/msg00141.html (9,832 bytes)

345. Re: [TenTec] Audio improvements on Argonaut VI (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 20 Aug 2018 12:46:50 -0400
Completing the sentence should read: "Any compromise is flat-out sloppiness, often attributed to old design habits." Paul, W9AC Unless it masks another problem, then it's a design issue for which I e
/archives//html/TenTec/2018-08/msg00142.html (10,314 bytes)

346. Re: [TenTec] Audio improvements on Argonaut VI (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 20 Aug 2018 13:20:47 -0400
not, you have no clue as to the minuscule magnitude of the issue." Thanks Bob, but I think I have a clue. People who actually know me (and my background) also think I have a clue. I regularly use hi
/archives//html/TenTec/2018-08/msg00144.html (9,542 bytes)

347. Re: [TenTec] Audio improvements on Argonaut VI (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 20 Aug 2018 13:56:21 -0400
Bob, I would rather not post a brag sheet on my background in audio engineering. It's not necessary, nor helpful to make a point. My comment was posted as a general observation when using certain hea
/archives//html/TenTec/2018-08/msg00148.html (12,720 bytes)

348. Re: [TenTec] Audio improvements on Argonaut VI (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 20 Aug 2018 13:58:03 -0400
Rick, It's more common and bothersome than you may think. In fact, the OP raised the issue, not me. You will find reports of high residual audio levels posted on eHam reviews. Moreover, it's often au
/archives//html/TenTec/2018-08/msg00150.html (12,280 bytes)

349. Re: [TenTec] Audio improvements on Argonaut VI (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 20 Aug 2018 14:21:02 -0400
Rick & Bob, I should have stated from the beginning that I wasn't singling out the Argo VI. The eham reviews I'm referring to encompass many different brands and models, not specific to the Argo VI o
/archives//html/TenTec/2018-08/msg00155.html (13,924 bytes)

350. Re: [TenTec] LONG: Audio improvements on Argonaut VI (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Tue, 21 Aug 2018 08:51:58 -0400
the output stabilizer pair of a 0.2uF and a 1-ohm resistor in series. I added the resistor." Good decision. That's a Zobel network on the output to stabilize the LM-383. The 383 often oscillates if
/archives//html/TenTec/2018-08/msg00166.html (11,188 bytes)

351. Re: [TenTec] Omni VI audio problem (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 19 Sep 2018 06:59:02 -0400
Here's a thorough explanation of the audio connector bonding problem from K9YC: http://www.audiosystemsgroup.com/Pin_1_Revisited.pdf The problem is ripe when circuit board sub-assemblies are used as
/archives//html/TenTec/2018-09/msg00068.html (9,695 bytes)

352. Re: [TenTec] Omni-6+ QSK Question (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Thu, 14 Mar 2019 17:00:11 -0400
And if that doesn't work, remove Plug 52. Plug 52 is engaging a CMOS 4066 quad bilateral switch. The switch is used to insert a constant level sidetone irrespective of the AF setting. Removing Plug 5
/archives//html/TenTec/2019-03/msg00058.html (9,370 bytes)

353. Re: [TenTec] Omni-6+ QSK Question (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Thu, 14 Mar 2019 17:06:44 -0400
I may have misunderstood the issue. Re-reading, it sounds like the objection is actually mechanical relay noise, not audible clicks in the headphones. Paul, W9AC Try setting Menu 1, LCO to OFF 73 Bar
/archives//html/TenTec/2019-03/msg00059.html (8,883 bytes)

354. [TenTec] PTO Rebuild Kits (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Thu, 25 Apr 2019 22:08:21 -0400
Anyone have one or two PTO rebuild kits sitting on a shelf they won't be using? If so, please contact me. Paul, W9AC _______________________________________________ TenTec mailing list TenTec@contest
/archives//html/TenTec/2019-04/msg00115.html (6,487 bytes)

355. Re: [TenTec] Classic TenTec QSK, etc. (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sat, 11 Jan 2020 09:39:25 -0500
IC-7610. The amplifier relay is keyed at all times. The only way to kill the relay is to rip it out. Steve's right. The relay must be extracted. Don't even think about it if you don't own a high-qua
/archives//html/TenTec/2020-01/msg00069.html (10,126 bytes)

356. Re: [TenTec] Omni Vl Plus Amplifier Switching (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Thu, 26 Mar 2020 23:01:11 -0400
eliminate the slow noisy amplifier relay to allow solid state QSK switching of an external amplifier. See this link: http://omni6.wikidot.com/amp Paul, W9AC _________________________________________
/archives//html/TenTec/2020-03/msg00026.html (7,031 bytes)

357. Re: [TenTec] PTO Grease (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sun, 22 Nov 2020 07:12:28 -0500
The trick is finding synthetic open gear grease that isn't prohibitively expensive. Today, I would not consider a PTO rebuild without synthetic grease. Otherwise, you're back to a rebuild at some poi
/archives//html/TenTec/2020-11/msg00040.html (8,167 bytes)

358. [TenTec] Triton IV 544 Digital (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Thu, 25 Feb 2021 22:08:16 -0500
I'm nearly finished with the restoration of a Triton IV (544 digital). I hear a pulsing frequency marker at 14.0 MHz but my 544 manual makes no mention of it. It's definitely not a 25 kHz or 100 kHz
/archives//html/TenTec/2021-02/msg00060.html (7,502 bytes)

359. Re: [TenTec] Triton IV 544 Digital (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 26 Feb 2021 08:10:52 -0500
Thanks, Mike. I'll look into it. Paul, W9AC Unplug the the frequency display and see if the signal goes away. The signal is coming from that unit. Verify it first and the decouple the vcc going into
/archives//html/TenTec/2021-02/msg00063.html (8,735 bytes)

360. Re: [TenTec] Triton IV 544 Digital (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 26 Feb 2021 11:20:29 -0500
Mike, Interesting. If the 544 schematic is correct, the Display Board has no common +Vcc. +Vcc is supplied individually to each 7-segment LED module via Q14-Q19 (PNP) on the Logic Board. +Vcc on the
/archives//html/TenTec/2021-02/msg00066.html (10,386 bytes)

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