Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Tue, 12 Oct 2010 18:20:20 -0500
David Goncalves W1EUJ So true. If there is a signal its in receive mode or on that its in transmit mode, like RX+ or TX+ or PTT on the control connector that can run an external relay to put the rece
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Tue, 12 Oct 2010 20:03:10 -0500
Why the 1N4007? They are poor PIN diodes and too slow to be protective diodes. If you want strong signal protection you need much faster diodes, 1N4454 or 1N914 derivatives. If you do RF switching wi
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Tue, 12 Oct 2010 23:07:57 -0500
Have you changed the battery lately? Its an active noise canceling headset, so may need a bit of power to work. 32 ohm cans ought to have enough sensitivity for the low impedance output of the Orion.
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Wed, 13 Oct 2010 10:37:47 -0500
Very poor choice because the 1N4007 has a structure like a PIN diode and so is slow to recover at RF, once turned on it makes an attenuator for many cycles. That and considerable capacitance makes it
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Thu, 21 Oct 2010 19:48:09 -0500
Tentec can probably supply a replacement crystal. If not International Crystal Manufacturing or some other crystal maker surely can. What is the frequency of the crystal? Sometimes you can find suita
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Thu, 21 Oct 2010 20:08:09 -0500
I've downloaded the manual. Looks like a parallel mode crystal on 5.656 MHz. If you order from ICM or another crystal maker, send them a copy of the module schematic page 3-18 of the Scout/Argo manua
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Thu, 21 Oct 2010 21:52:30 -0500
On the tentec web page they have a tab for support and parts. On it there's a place to identify the part and ask if they can supply it. You could make use of that. 73, Jerry, K0CQ On 10/21/2010 9:18
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Thu, 28 Oct 2010 21:19:26 -0500
You are going to have to move the carrier frequencies out to the slopes of the filter to get back to SSB. That takes a lot of tweaking of the shifting trimmers which interact between CW, LSB, and USB
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 29 Oct 2010 10:43:42 -0500
It would not be silly to test and with a receiver with a working S-meter and a calibrator signal or any other local steady signal you just tune across the signal and plot the S-meter readings vs. fre
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sat, 30 Oct 2010 19:25:52 -0500
A long insulated screwdriver. Perhaps a wooden dowel or plastic rod, probably a quarter inch diameter or less filed to fit the adjustment slots. Fiberglass rod like used to hold up a flag on a bicycl
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sun, 31 Oct 2010 16:31:31 -0600
Dynamic Noise Reduction is a nearly unachievable Holy Grail that means different things to different users and designers. It can mean reduction of circuit noise, natural atmospheric noise like lightn
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sun, 31 Oct 2010 18:53:28 -0600
I own a Carver preamp that is 25 years old and contains Bob Carver's "autocorrelation" circuitry, which does a very good job of reducing noise from LPs, etc. I was wondering if Carver could do it 25
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Thu, 02 Sep 2010 12:33:22 -0500
The TS-120 and TS130 were solid rigs, but didn't have the strong signal handling receiver of the later Tentecs. The 820/830 is a bit more complex and I've seen it confuse new hams. It also needs to b
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Thu, 02 Sep 2010 14:49:09 -0500
The comment on the front end is valid but probably not a problem in his neighborhood. Its detectable but not disastrous. Some strong signals have a bit of splatter that's not heard with a Corsair II
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 03 Sep 2010 10:48:54 -0500
Do it yourself. No list participant can other than the administrator. Go to http://lists.contesting.com/mailman/listinfo/tentec that is on the bottom of EVERY post for instructions. 73, Jerry, K0CQ I
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 03 Sep 2010 13:45:31 -0500
On 9/3/2010 5:55 AM, tubsc66@aol.com wrote: Hi everyone, my name is Chris (KC5IIE), and Im a proud new owner of 3 (yes, 3!) Ten Tec rigs. I bought an Omni D a few weeks ago for a great price and I fe
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 03 Sep 2010 13:57:39 -0500
On 9/3/2010 6:53 AM, Hulett, Russell wrote: I owned a TT PS for awhile, but it had a single pass transistor without the OVP module ( crowbar ), so fear of putting 25 VDC into the rig from a 30-year o
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 03 Sep 2010 14:40:14 -0500
Its good only for CW, won't pass SSB. The MFJ input impedance is much lower, can't be sure about the output impedance but that's probably not nearly the problem that loading a circuit expecting 220k
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sat, 04 Sep 2010 13:06:31 -0500
I've not yet transmitted with mine, but it should do fine on FM transmit as well as SSB. I found the best price last year was at Sam Ash. 73, Jerry, K0CQ