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301. [TenTec] Re: N4LQ and the 2.8kHz Pill (score: 1): Author: geraldj@ames.net (Dr. Gerald N. Johnson, P.E.); Date: Sun, 03 Jan 1999 17:14:30 -0600; The phase delay of a crystal filter changes rapidly at the knee. A little frequency shift could easily be magnified by that phase shift to sound like a wider chirp. It would seem to me to be best to; /archives//html/TenTec/1999-01/msg00040.html (8,928 bytes)
302. [TenTec] Re: N4LQ and the 2.8kHz Pill (score: 1): Author: geraldj@ames.net (Dr. Gerald N. Johnson, P.E.); Date: Sun, 03 Jan 1999 22:23:13 -0600; Tune it to ten dB down the slope of a filter, look at the output without AGC. The filter slope will make a frequency discriminator. Or look at with nearly zero beat, you should be able to see the cha; /archives//html/TenTec/1999-01/msg00048.html (8,326 bytes)
303. [TenTec] Re: N4LQ and the 2.8kHz Pill (score: 1): Author: geraldj@ames.net (Dr. Gerald N. Johnson, P.E.); Date: Mon, 04 Jan 1999 09:51:48 -0600; The ARRL CW scope picture I believe is only intended to show chopping of the first dot by vox delay and sharpness of rise and fall that leads to clicks. The radio used at W1AW is probably not the rad; /archives//html/TenTec/1999-01/msg00052.html (9,032 bytes)
304. [TenTec] PTO rebuild problem (score: 1): Author: geraldj@ames.net (Dr. Gerald N. Johnson, P.E.); Date: Mon, 04 Jan 1999 12:32:45 -0600; Did you thoroughly clean the threads? I ran them through a paper towel pushing towel into the threads several times to remove old grease and lumps. 73, Jerry, K0CQ -- FAQ on WWW: http://www.contestin; /archives//html/TenTec/1999-01/msg00057.html (6,856 bytes)
305. [TenTec] question on things (score: 1): Author: geraldj@ames.net (Dr. Gerald N. Johnson, P.E.); Date: Tue, 05 Jan 1999 16:36:57 -0600; There are two, the 1208 and the 1209. About $120 in kit form. the 1208 use 20m as the IF, the 1209 uses 2m as the IF. They run about 8 watts output, need about 5 watts drive. I have a 1209. There are; /archives//html/TenTec/1999-01/msg00072.html (8,252 bytes)
306. [TenTec] Omni VI chirp comment (score: 1): Author: geraldj@ames.net (Dr. Gerald N. Johnson, P.E.); Date: Wed, 06 Jan 1999 10:26:19 -0600; I think the bigger problem will be leakage. Any leak from the transmitter BFO will be heard in the receiver. Any leak from the receiver BFO that gets past the filter will be radiated as a background; /archives//html/TenTec/1999-01/msg00088.html (8,592 bytes)
307. [TenTec] What chirp? (score: 1): Author: geraldj@ames.net (Dr. Gerald N. Johnson, P.E.); Date: Wed, 06 Jan 1999 19:22:07 -0600; I just listened to the 0100Z ARRL bulletins on 14.0475 and 7.... and 3.5 and I could hear no chip, whoop, bloop or poop. A harsh leading edge on all probable comes from running in fast QSK mode clipp; /archives//html/TenTec/1999-01/msg00100.html (7,343 bytes)
308. [TenTec] One last chirp (score: 1): Author: geraldj@ames.net (Dr. Gerald N. Johnson, P.E.); Date: Thu, 07 Jan 1999 18:43:42 -0600; I listened to the beginning of 0000Z code practice. I still can't find anything but a hard leading edge. Its most pronounced with the signal nearly centered in the SSB filter, least pronounced with 5; /archives//html/TenTec/1999-01/msg00123.html (8,931 bytes)
309. [TenTec] One last chirp (score: 1): Author: geraldj@ames.net (Dr. Gerald N. Johnson, P.E.); Date: Fri, 08 Jan 1999 01:39:25 -0600; The circuit of the filter has little to do with the time and amplitude response. It takes fewer crystals to get a square edged frequency response if the time response is neglected. If the time respon; /archives//html/TenTec/1999-01/msg00131.html (10,234 bytes)
310. [TenTec] One last chirp (score: 1): Author: geraldj@ames.net (Dr. Gerald N. Johnson, P.E.); Date: Fri, 08 Jan 1999 11:25:17 -0600; The easiest configuration (least mathematical) response curve for a lattice filter is more or less square with notches adjacent to the band for a tchebychev type response prone to ringing. The ladder; /archives//html/TenTec/1999-01/msg00147.html (10,448 bytes)
311. [TenTec] DSP Units? (score: 1): Author: geraldj@ames.net (Dr. Gerald N. Johnson, P.E.); Date: Fri, 08 Jan 1999 11:25:22 -0600; I have had good results with my DSP-59+ (with the latest software upgrade, there was a definite improvement) in improving the signal to noise ratio of very marginal signals, and with reducing the noi; /archives//html/TenTec/1999-01/msg00148.html (8,491 bytes)
312. [TenTec] One, final, final chirp (score: 1): Author: geraldj@ames.net (Dr. Gerald N. Johnson, P.E.); Date: Fri, 08 Jan 1999 11:25:28 -0600; Clicks will be most perceptible in the wide receiver IF filter, least perceptible in the narrow IF filter. The details of a particular filter's frequency AND time response will determine what part of; /archives//html/TenTec/1999-01/msg00149.html (7,618 bytes)
313. [TenTec] One last chirp (score: 1): Author: geraldj@ames.net (Dr. Gerald N. Johnson, P.E.); Date: Fri, 08 Jan 1999 15:55:59 -0600; I don't think its the placement of the transmit BFO frequency in the filter, I think its overdriving the system and thus negating the keying shaping by the ALC. I propose that a better and simpler cu; /archives//html/TenTec/1999-01/msg00156.html (8,896 bytes)
314. [TenTec] LADDER FILTERS? (score: 1): Author: geraldj@ames.net (Dr. Gerald N. Johnson, P.E.); Date: Fri, 08 Jan 1999 15:56:10 -0600; Ladder filters don't have as long an engineering history, when you try for a wider filter they tend to be asymmetrical, and they are very dependent on crystal series resonant Q. For narrow simple fil; /archives//html/TenTec/1999-01/msg00157.html (9,403 bytes)
315. [TenTec] One last chirp (score: 1): Author: geraldj@ames.net (Dr. Gerald N. Johnson, P.E.); Date: Fri, 08 Jan 1999 18:30:08 -0600; So put in some more delay. Add a threshold to the RF side of the keying so it doesn't happen as soon. Maybe a couple diodes some where to require a little higher voltage to turn on the RF while causi; /archives//html/TenTec/1999-01/msg00164.html (8,041 bytes)
316. [TenTec] Ideas for Anyone Still Reading (score: 1): Author: geraldj@ames.net (Dr. Gerald N. Johnson, P.E.); Date: Fri, 08 Jan 1999 18:30:34 -0600; Listening locally for chirp at a harmonic may be inconclusive because the chirp (if there is one, I don't hear it on W1AW) could be strong enough to reach the local receiver, but not be heard down th; /archives//html/TenTec/1999-01/msg00166.html (7,267 bytes)
317. [TenTec] Corsair II Display trouble (score: 1): Author: geraldj@ames.net (Dr. Gerald N. Johnson, P.E.); Date: Fri, 08 Jan 1999 20:43:23 -0600; First guess, crystal oscillator or power to the display module. Does the keyer work during the time that the display doesn't work? They use a common microprocessor. 73, Jerry, K0CQ -- FAQ on WWW: htt; /archives//html/TenTec/1999-01/msg00174.html (6,945 bytes)
318. [TenTec] Transformer Oil - PCB's (score: 1): Author: geraldj@ames.net (Dr. Gerald N. Johnson, P.E.); Date: Sun, 10 Jan 1999 12:57:48 -0600; Don't lick the can, don't use it for salad oil. Has it any detectable odor, especially sweet? If so there's PCB in it in quantity. If not the employees that worked immersed in PCB were never injured,; /archives//html/TenTec/1999-01/msg00202.html (6,996 bytes)
319. [TenTec] Scout 555 garbled SSB TX. (score: 1): Author: geraldj@ames.net (Dr. Gerald N. Johnson, P.E.); Date: Mon, 11 Jan 1999 11:32:05 -0600; Full charge should be 13.8 up to 14.2. Perhaps a little lower on the deep cycle, but not a lot. Not as low as 12.7 I don't think. What I think you have is symptoms of a regulator in the scout without; /archives//html/TenTec/1999-01/msg00227.html (8,008 bytes)
320. [TenTec] 238 Tuner settings (score: 1): Author: geraldj@ames.net (Dr. Gerald N. Johnson, P.E.); Date: Mon, 11 Jan 1999 14:52:45 -0600; Sounds to me as if a shaft coupling is loose, or a gear mesh isn't tight. 73, Jerry, K0CQ -- FAQ on WWW: http://www.contesting.com/tentecfaq.htm Submissions: tentec@contesting.com Administrative requ; /archives//html/TenTec/1999-01/msg00235.html (7,373 bytes)

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