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181. Re: [TenTec] Sorry for my post (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Tue, 04 Feb 2003 11:26:45 -0600
Having Reply-To enabled tends to cause more responses to go to the list that should be off list, and causes more "sorry for my post" posts. And on some lists can cause moderator complaints about off
/archives//html/TenTec/2003-02/msg00173.html (9,141 bytes)

182. Re: [TenTec] playing with the Corsair II (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Wed, 05 Feb 2003 16:27:26 -0600
I think 2.4 is a little wide and I often use the pass band tuning to roll off highs in my Corsair II then emphasize their roll off with a DSP audio filter or a passive speaker filter rolling off at 1
/archives//html/TenTec/2003-02/msg00272.html (10,245 bytes)

183. Re: [TenTec] Omni V RAM battery problem (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sat, 08 Feb 2003 21:53:01 -0600
Probably the memory can be powered externally. A 3 volt battery and a couple schottky diodes to allow the higher voltage of the 3 volt battery or the 5 volt supply to run the memory, maybe a resistor
/archives//html/TenTec/2003-02/msg00373.html (7,565 bytes)

184. Re: [TenTec] confused re Corsair II VFO jumper (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Mon, 10 Feb 2003 20:15:23 -0600
You need another jumper, pins 2 to 6 on the auxiliary connector to get power to the onboard PTO. 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Johnson, electrical engineer. Reproduction b
/archives//html/TenTec/2003-02/msg00443.html (7,681 bytes)

185. Re: [TenTec] filters for digital modes and qrp (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Wed, 12 Feb 2003 14:04:50 -0600
250 would probably be narrow for pactor. The more important feature is the relative phase response of the filter. A Tentec 250 Hz filter may pass pactor unharmed while a 250 Hz Kenwood filter would d
/archives//html/TenTec/2003-02/msg00529.html (8,948 bytes)

186. Re: [TenTec] Mail Replies - What Happened? (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sun, 16 Feb 2003 10:23:17 -0600
The list administrator had no warning it was going to change. There was a glitch at the server that reloaded the mail program with different parameters. The list administrator hasn't been happy with
/archives//html/TenTec/2003-02/msg00603.html (9,374 bytes)

187. Re: [TenTec] RX-10 (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Tue, 18 Feb 2003 21:54:13 -0600
Put a GOOD ground on your receiver. You can easily be depending on the ground through the power supply and the rectifiers are modulating that ground, whether linear supply or switching supply. A swit
/archives//html/TenTec/2003-02/msg00719.html (7,781 bytes)

188. Re: [TenTec] 60 Meters !!! (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sat, 22 Feb 2003 19:14:26 -0600
Since the fundamental PTO range is 5 to 5.5 the odds of adding a controllable 5 MHz output band without excess birdies are essentially zero. Outboard boxes might mix from some higher band but the PTO
/archives//html/TenTec/2003-02/msg00840.html (8,649 bytes)

189. Re: [TenTec] 60 Meters !!! (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sun, 23 Feb 2003 10:03:50 -0600
http://www.bright.net/~kanga/kanga/ has KK7B designed kits for the direct conversion transmitters and receivers. The latest R2PRO had a glorious article in QST a few years ago. The kits are available
/archives//html/TenTec/2003-02/msg00853.html (8,733 bytes)

190. Re: [TenTec] Johnson PS ?? (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sun, 23 Feb 2003 14:51:20 -0600
It may take a minimum load to regulate. Try it with a 3 or 4 amp load. 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Johnson, electrical engineer. Reproduction by permission only.
/archives//html/TenTec/2003-02/msg00865.html (7,369 bytes)

191. Re: [TenTec] D-104 Microphone Notes (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Wed, 26 Feb 2003 09:36:47 -0600
The crystal D-104 needs more like 500k to 1 Meg to keep from having excess roll off. The peak in response is outside the filter pass band. The peak response has been known to overdrive audio and bala
/archives//html/TenTec/2003-02/msg00960.html (8,884 bytes)

192. Re: [TenTec] Orion, NRD-545, DSP, filters etc (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Tue, 28 Jan 2003 21:34:56 -0600
In my experience, most crystal lattice filters ring adversely when hit by pulses, such as noise or fast CW. Tentec uses ladder filters that have a less square frequency response and as a consequence
/archives//html/TenTec/2003-01/msg00625.html (9,810 bytes)

193. Re: [TenTec] Pegasus S-Meter Anomaly (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Tue, 28 Jan 2003 21:35:00 -0600
It may be that there are two AVC loops. I'd expect one working at RF to protect the A/D from being overdriven, and a second one working after detection and filtering to level the audio for the speake
/archives//html/TenTec/2003-01/msg00626.html (8,395 bytes)

194. Re: [TenTec] Pegasus S-Meter Anomaly (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Wed, 29 Jan 2003 00:04:49 -0600
The splatter could have been from an overdriven Collins rig, or an overdriven A/D. The envelope of the SSB signal also follows the syllabic variations of the audio signal, so a fast AVC would show sy
/archives//html/TenTec/2003-01/msg00630.html (8,201 bytes)

195. Re: [TenTec] Pegasus S-Meter Anomaly (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Wed, 29 Jan 2003 10:50:37 -0600
It would be logical to me for the RF AGC to be fast while the audio AGC was slow and for the RF AGC to be faster on strong signals to protect the A/D better. The DSP always works better with the stro
/archives//html/TenTec/2003-01/msg00645.html (8,891 bytes)

196. Re: [TenTec] Corsair II AGC - had pop? If so, mods? (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Wed, 29 Jan 2003 13:50:09 -0600
If I run it will full RF gain on a really good antenna and fast AGC there can be some popping on really strong CW. There's enough time delay in the 16 poles of filter that the gain control before the
/archives//html/TenTec/2003-01/msg00652.html (7,572 bytes)

197. Re: [TenTec] SWR, and meters (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Wed, 29 Jan 2003 19:12:58 -0600
Many so called SWR meters are rough approximations and their error depends to a great degree on the local voltage and current on the line. A good meter would use those to derive power, but the monima
/archives//html/TenTec/2003-01/msg00667.html (11,119 bytes)

198. Re: [TenTec] Jupiter SWR, and VSWR generally (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Wed, 29 Jan 2003 21:06:54 -0600
I've not been able to identify the diodes Bird uses. They seem to have a far lower threshold voltage than ordinary HP Schottky diodes. I have had a few low power Bird slugs needing diodes. A common p
/archives//html/TenTec/2003-01/msg00672.html (8,236 bytes)

199. Re: [TenTec] DeOxit - Corsair II (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Thu, 30 Jan 2003 13:55:26 -0600
Don't spray. Buy the micrdropper bottle and apply only to the metal contacts. Its effective there, but detrimental to the insulation. 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Johnson
/archives//html/TenTec/2003-01/msg00688.html (7,051 bytes)

200. Re: [TenTec] Disparaging Corsairs, Pro II, etc hi hi (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Thu, 30 Jan 2003 20:56:28 -0600
The TS850 was quite a bit later than the TS930. The 850 has performed well, it had better reviews, especially in Europe than most other radios of the era. The TS930 seems to like to self destruct, th
/archives//html/TenTec/2003-01/msg00699.html (9,023 bytes)

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