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Total 357 documents matching your query.

121. Re: [TenTec] strange QRM/QRN/RFI source? (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Thu, 15 May 2003 08:13:16 -0500
When my FT-736R is running on its internal switching supply, the X-10 in my house won't run. One time the fan controlled by the X-10 came on from the switching noise of the FT-736R. As far as I know,
/archives//html/TenTec/2003-05/msg00372.html (9,274 bytes)

122. Re: [TenTec] strange QRM/QRN/RFI source? (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Thu, 15 May 2003 10:59:59 -0500
There must be different varieties of incompatible X-10? I'm using the simple plug in outlet controller (latching relay) and the simplest controller. Either the FT-736R is putting noise on the line or
/archives//html/TenTec/2003-05/msg00380.html (10,342 bytes)

123. Re: [TenTec] FCC R&O link, re 60 Meters (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Thu, 15 May 2003 13:10:01 -0500
Is there a link for plain language? Word and I conflict so .doc files aren't readable on my computers. 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Johnson, electrical engineer. Reproduc
/archives//html/TenTec/2003-05/msg00392.html (8,343 bytes)

124. Re: [TenTec] 60M (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Thu, 15 May 2003 22:22:51 -0500
Can't work mobile, the rules for 60m prohibit mobile operation. What I've seen so far doesn't give a tolerance on the frequency or specify how to accurately measure the frequency of a suppressed carr
/archives//html/TenTec/2003-05/msg00456.html (8,972 bytes)

125. Re: [TenTec] 60M (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Fri, 16 May 2003 14:55:16 -0500
You could use an antenna analysis program like ELNEC or EZNEC or the other NEC products to determine true antenna gain (but they are all 3 dB off when the gain is computed with ground in place becaus
/archives//html/TenTec/2003-05/msg00487.html (9,539 bytes)

126. Re: [TenTec] 60M (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Fri, 16 May 2003 21:15:20 -0500
I thought I saw it said that the new allocation on 60m was restricted to fixed stations, no portable, mobile, or hand carried. I can't prove that. I just read the text of the FCC Report and Order and
/archives//html/TenTec/2003-05/msg00518.html (10,354 bytes)

127. Re: [TenTec] Rohde& Schwarz and the IC-7800 (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sat, 17 May 2003 16:50:49 -0500
IP3 should go up 30 dB with 10 dB input attenuation. Its third order intercept. 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Johnson, electrical engineer. Reproduction by permission only
/archives//html/TenTec/2003-05/msg00555.html (7,628 bytes)

128. Re: [TenTec] Rohde& Schwarz and the IC-7800 (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sat, 17 May 2003 20:38:10 -0500
What I'm looking for in a radio for my dad (who is very sight disadvantaged, only peripheral vision, and over 90) is a radio with minimal controls, no menus, automatic antenna tuner. Gain, bandswitch
/archives//html/TenTec/2003-05/msg00567.html (8,025 bytes)

129. Re: [TenTec] Orion questions (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sun, 18 May 2003 11:50:49 -0500
I can't speak for the Orion's dsp, but my audio dsp does better noise reduction and better CW S/N when it has more input bandwidth, rather than narrow. This I suspect comes from narrow band noise bei
/archives//html/TenTec/2003-05/msg00593.html (9,124 bytes)

130. Re: [TenTec] Orion questions (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sun, 18 May 2003 17:29:36 -0500
I've not experimented with level going into my DSP-59+. It complains when I give it too much so I keep it below that. 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Johnson, electrical eng
/archives//html/TenTec/2003-05/msg00617.html (9,208 bytes)

131. Re: [TenTec] An Orion Oops?? (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sun, 18 May 2003 17:35:49 -0500
ARe you SURE the 5 pin DIN plug won't go in the 8 pin DIN jack. DIN plugs and jacks are arranged so that many of the low pin count plugs fit the larger pin count jacks. Its that way on purpose. And m
/archives//html/TenTec/2003-05/msg00619.html (8,571 bytes)

132. Re: [TenTec] Orion questions (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sun, 18 May 2003 18:49:13 -0500
For sure the DSP needs all the signal it can take without clipping, otherwise the noise it sees is mostly digitizing noise, not radio noise. 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N.
/archives//html/TenTec/2003-05/msg00638.html (9,183 bytes)

133. Re: [TenTec] Rock-bound & snivlin' (was 60M) (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sun, 18 May 2003 18:54:24 -0500
Without military or government communications experience, the assignment of frequency by center of the channel is foreign to amateur radio. What these mean is that we will be running SSB with the car
/archives//html/TenTec/2003-05/msg00639.html (8,318 bytes)

134. Re: [TenTec] Quietness/Apparent Sensitivity (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Mon, 19 May 2003 21:07:56 -0500
There is much value in the receiver that can hear 20 or 30 dB better than the AVERAGE ambient noise level. You say it "hovers" and it does exactly that but noise varies. Sometimes it gets quieter, so
/archives//html/TenTec/2003-05/msg00691.html (9,014 bytes)

135. Re: [TenTec] DC Power Supply Backup (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Wed, 21 May 2003 20:46:08 -0500
Its more likely that the crowbar would fry than the battery. A good battery can deliver a couple kiloamps short circuit current and the crowbar SCR probably will melt at that current. Then the batter
/archives//html/TenTec/2003-05/msg00801.html (9,103 bytes)

136. Re: [TenTec] Power Supply Damage Control (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Thu, 22 May 2003 11:28:34 -0500
Most times, Astrons use the ancient LM-723 voltage regulator chip. 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Johnson, electrical engineer. Reproduction by permission only.
/archives//html/TenTec/2003-05/msg00833.html (7,913 bytes)

137. Re: [TenTec] INRAD Filter Question (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Fri, 23 May 2003 11:27:37 -0500
If anything its the other way around. Steeper skirts and squarer passband corners mean more ringing, and so the Inrad should ring more than the TT. 73, Jerry, K0CQ -- Entire content copyright Dr. Ger
/archives//html/TenTec/2003-05/msg00913.html (8,362 bytes)

138. Re: [TenTec] INRAD Filter Question (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Fri, 23 May 2003 15:53:44 -0500
Ringing may depend on the CW frequency as it passes through the filter. In the center it likely will ring the least, near the passband corners where the phase delay changes most rapidly, it will prob
/archives//html/TenTec/2003-05/msg00937.html (12,022 bytes)

139. Re: [TenTec] INRAD Filter Question (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Fri, 23 May 2003 17:11:58 -0500
Lattice filters tend to offer very good symmetry with ringing and steep skirts. Ladder filters are less symmetrical the wider the bandwidth. Its inherent in the ladder network to be asymmetrical. 73,
/archives//html/TenTec/2003-05/msg00945.html (9,443 bytes)

140. Re: [TenTec] INRAD Filter Question (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sat, 24 May 2003 08:56:32 -0500
Those filter plots might be part of a review of vintage TT radios without bandpass tuning, maybe Triton, for sure before Corsair. Might be in that vintage manual. Measuring in the vintage single conv
/archives//html/TenTec/2003-05/msg00959.html (9,644 bytes)

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