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101. Re: [TenTec] Ten-Tec PA design (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 14 Jul 2006 13:34:12 -0500
The 25 amp fuse is too insensitive for PA protection. Neither it nor a 25 amp breaker are likely to trip at less than 125% which they should hold indefinitely, that's 31.25 amps. That's why I use a 1
/archives//html/TenTec/2006-07/msg00421.html (8,886 bytes)

102. Re: [TenTec] Ten-Tec PA design (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 14 Jul 2006 13:37:45 -0500
ALC circuitry!! Just a couple days ago I was told there was NO ALC circuitry in the Orion. Just after I'd pointed out that ALC could lead to faster rise times and a sharp transition from rise to leve
/archives//html/TenTec/2006-07/msg00422.html (10,182 bytes)

103. Re: [TenTec] Ten-Tec PA design (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 14 Jul 2006 14:24:37 -0500
Which means that if the ALC limits the power it can cause the effective rise time to be shorter than the slope selected in software and that shortening effect can be dependent on the power selected a
/archives//html/TenTec/2006-07/msg00425.html (9,625 bytes)

104. Re: [TenTec] Ten-Tec PA design (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 14 Jul 2006 15:29:38 -0500
Buss brand ATC fuses and holders are in most hardware stores, auto parts stores and my local Wallyworld. -- 73, Jerry, K0CQ, All content copyright Dr. Gerald N. Johnson, electrical engineer _________
/archives//html/TenTec/2006-07/msg00433.html (9,425 bytes)

105. Re: [TenTec] AirPax Purchase (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 14 Jul 2006 15:54:44 -0500
Buy a bucket of them! Its larger than the approved TenTec item but seems to have the same characteristics from looking at the Airpax specification shown at: http://www.pocosales.com/ProductSpecificat
/archives//html/TenTec/2006-07/msg00435.html (9,102 bytes)

106. Re: [TenTec] "will SDR be here tomorrow." (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 14 Jul 2006 17:49:03 -0500
Didn't affect me, I got my extra in 1959. But being drafted for the war in Nam sure cut my freedom and spending money. Walter Ashe, Boston's Radio Shack, and Allied Radio were bought by Tandy for the
/archives//html/TenTec/2006-07/msg00439.html (12,179 bytes)

107. Re: [TenTec] Airpax part number (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 14 Jul 2006 19:34:31 -0500
The critical sections of that part number are 51 for fast DC and 20.0A for 20 amps. All the rest define electrically uncritical things like toggle handle color, mounting hardware color, and the prese
/archives//html/TenTec/2006-07/msg00444.html (10,442 bytes)

108. Re: [TenTec] SDR-1000 (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 14 Jul 2006 19:35:26 -0500
What size should the Orion use? -- 73, Jerry, K0CQ, All content copyright Dr. Gerald N. Johnson, electrical engineer _______________________________________________ TenTec mailing list TenTec@contest
/archives//html/TenTec/2006-07/msg00445.html (9,359 bytes)

109. Re: [TenTec] SDR-1000 (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 14 Jul 2006 20:22:08 -0500
-114 DBM is a pretty good MDS for radar bandwidth. For CW bandwidth, MDS of -148 dBm is pretty good. Noise power goes with the square of bandwidth. Noise is generated by random electron motion. Its a
/archives//html/TenTec/2006-07/msg00455.html (10,148 bytes)

110. Re: [TenTec] SDR-1000 (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sat, 15 Jul 2006 12:22:29 -0500
It all depends on the bandwidth. Given a 5 Hz bandwidth, -160 dBm MDS would be gross. In a 20 KHz bandwidth, -160 would be stupendous, unbelievable, possible only with several minutes of averaging. M
/archives//html/TenTec/2006-07/msg00470.html (10,798 bytes)

111. Re: [TenTec] TenTec] SDR-1000 MDS (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sat, 15 Jul 2006 21:52:47 -0500
With the audio DSP in my FT-857D, I don't find the DSP CW narrow filter enhances a weak signals signal to noise. It remove QRM but doesn't bring the signal out of the noise. The mechanical filter at
/archives//html/TenTec/2006-07/msg00479.html (7,852 bytes)

112. Re: [TenTec] TenTec] SDR-1000 MDS (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 16 Jul 2006 09:56:30 -0500
Some filters do ring on noise and fast CW. The vintage Collins S-line filter is one of those. The Collins mechanical filter for the FT-857D is much better. The 270 Hz Kenwood filter in the TS430 was
/archives//html/TenTec/2006-07/msg00482.html (10,592 bytes)

113. Re: [TenTec] SDR 1000 vs Orion vs SDR-X (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 16 Jul 2006 12:05:46 -0500
6 has been open for more than 24 hours. 2m has had some bright spots working New England from Iowa yesterday, only Ohio today. 73, Jerry, K0CQ _______________________________________________ TenTec m
/archives//html/TenTec/2006-07/msg00486.html (8,176 bytes)

114. Re: [TenTec] Wanted = binaural CW filtre (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 17 Jul 2006 08:28:54 -0500
Kanga. www.kanga.com? -- 73, Jerry, K0CQ, All content copyright Dr. Gerald N. Johnson, electrical engineer _______________________________________________ TenTec mailing list TenTec@contesting.com ht
/archives//html/TenTec/2006-07/msg00517.html (8,166 bytes)

115. Re: [TenTec] FS: Corsair 1 and Delta 580 Transceivers (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 17 Jul 2006 19:12:40 -0500
The frequencies are the same and the block diagram that same but the RF and first IF stage circuits are drastically different. They do use the same filters. <SNIP> -- 73, Jerry, K0CQ, All content cop
/archives//html/TenTec/2006-07/msg00545.html (8,339 bytes)

116. Re: [TenTec] How handle DUST? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 17 Jul 2006 19:25:07 -0500
That just puts dust into motion. Better to paint the radio dust colored. -- 73, Jerry, K0CQ, All content copyright Dr. Gerald N. Johnson, electrical engineer _________________________________________
/archives//html/TenTec/2006-07/msg00547.html (8,739 bytes)

117. Re: [TenTec] Fwd: Is Orion really worth it? Given thepublished problems? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 17 Jul 2006 21:54:35 -0500
So the gain is set too high causing ALC to clip the power before its had time to rise all the way and level off gently. Lower the transmitter gain. The exciter ALC doesn't control the amplifier, its
/archives//html/TenTec/2006-07/msg00573.html (9,856 bytes)

118. Re: [TenTec] Fwd: Is Orion really worth it?Given thepublished problems? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 18 Jul 2006 09:12:19 -0500
There is an ALC setting, its for power output. The manual says ALC sets the power output whether 1 watt or 100 watts. That compensates for the varying gain of the transmitter circuits from 160 throug
/archives//html/TenTec/2006-07/msg00590.html (12,004 bytes)

119. Re: [TenTec] Fwd: Is Orion really worth it? Giventhepublished problems? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 18 Jul 2006 19:57:22 -0500
You are the exception if you watch closely and never overdrive the amplifier. The motorboating came from a problem of ALC time constant too fast. Should have been fast attack, slow decay to prevent t
/archives//html/TenTec/2006-07/msg00621.html (10,211 bytes)

120. Re: [TenTec] Fwd: Is Orion really worthit? Giventhepublished problems? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 18 Jul 2006 21:49:15 -0500
It appears to be the power output setting. Actually sets ALC level. Then there is a mic gain setting. That can set how hard the ALC is tripped. Is there a CW gain setting on the computer options? Tha
/archives//html/TenTec/2006-07/msg00624.html (9,014 bytes)

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