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Total 357 documents matching your query.

141. Re: [TenTec] INRAD Filter Question (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sun, 25 May 2003 16:39:30 -0500
Time response IS very important in the REAL world where switch clicks, lightning static, and power line noise accompanies the desired signals. Its not all about separating bandwidth limited signals (
/archives//html/TenTec/2003-05/msg00992.html (10,204 bytes)

142. Re: [TenTec] INRAD Filter Question (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sun, 25 May 2003 19:49:48 -0500
The mechanical filters Collins has supplied for amateur radio equipment are very poor in static. I'm going to gaussian or bessel in my next home built radio. The mechanical and lattice crystal filter
/archives//html/TenTec/2003-05/msg01000.html (9,265 bytes)

143. Re: [TenTec] Omni "C" readout (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Wed, 28 May 2003 11:44:32 -0500
That connector movement will be more effective if a quarter drop of DeoXit from Caig Labs is applied to each contact. Don't spray, use the dropper bottle and the tiniest amount on each connection. 73
/archives//html/TenTec/2003-05/msg01081.html (7,509 bytes)

144. Re: [TenTec] an antenna question (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Wed, 02 Apr 2003 12:29:34 -0600
Probably will work (as in tune and radiate), but you will have RF on the outside of the coax because the none resonant near 1/2 wave radials won't act like a ground plane. 73, Jerry, K0CQ -- Entire c
/archives//html/TenTec/2003-04/msg00040.html (8,258 bytes)

145. Re: [TenTec] Old Modes never die... they just get soundcard support! (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Fri, 04 Apr 2003 15:01:39 -0600
RTTY accomplished in the old fashioned ways with TTY machine or computer in terminal mode and a dedicated TU (terminal unit) are simplistic compared to the wheedles and whistles of the many alternati
/archives//html/TenTec/2003-04/msg00138.html (12,177 bytes)

146. Re: [TenTec] Need 7417 Chip (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sun, 13 Apr 2003 21:10:35 -0500
In the latest Mouser catalog. 512-DM7417N (dip package) 90 cents. In Digikey, the same part DM7417N-ND is 88 cents. 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Johnson, electrical engin
/archives//html/TenTec/2003-04/msg00335.html (7,522 bytes)

147. Re: [TenTec] Ten Tec vs. Inrad 9 MHz Filters (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Tue, 15 Apr 2003 14:09:21 -0500
In my opinion, the relatively gentle slopes and the rounded shoulders of the standard TT filters are major secrets to the great performance of TT receivers under adverse conditions. True, the gentle
/archives//html/TenTec/2003-04/msg00381.html (9,180 bytes)

148. Re: [TenTec] Ten Tec vs. Inrad 9 MHz Filters (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Tue, 15 Apr 2003 18:30:36 -0500
For sure, the fewer ringing artifacts the roofing filter adds, the easier it is on the DSP. It is possible in DSP to remove those artifacts (e.g. correct the irregular phase response) but its more wo
/archives//html/TenTec/2003-04/msg00389.html (8,407 bytes)

149. Re: [TenTec] Enhanced SSB (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Fri, 18 Apr 2003 11:12:32 -0500
SSB achieves its superior communications performance compared to double sideband AM by saving the carrier power and concentrating the transmitter power into just one sideband AND by allowing half the
/archives//html/TenTec/2003-04/msg00461.html (15,938 bytes)

150. Re: [TenTec] Enhanced SSB (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Fri, 18 Apr 2003 13:03:33 -0500
If the Collins S-line you had used 3.1 KHz filters it was something changed after the factory. The S-line filter (in my 75S3B FA21... part number stands for 2.1 KHz). The Gold Dust twins might have h
/archives//html/TenTec/2003-04/msg00464.html (9,929 bytes)

151. Re: [TenTec] Enhanced SSB (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Fri, 18 Apr 2003 16:26:17 -0500
Couldn't be a F455J-31 in the KWS-1. Its IF was 250 KHZ. 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Johnson, electrical engineer. Reproduction by permission only.
/archives//html/TenTec/2003-04/msg00473.html (9,062 bytes)

152. Re: [TenTec] Enhanced SSB (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sat, 19 Apr 2003 09:47:12 -0500
I suspect any early radio SSB was derived from wire line multiplex and probably based on LC filters at some convenient frequency like 15 or 20 KHz. Western Electric had the engineering services of th
/archives//html/TenTec/2003-04/msg00522.html (8,942 bytes)

153. Re: [TenTec] Enhanced SSB (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sat, 19 Apr 2003 12:38:07 -0500
Not at all hard to answer, just hard to answer without buckets of sarcasm. The main reason I see is to transmit the "golden" basso profundo radio announcer tones at great expense in transmitter power
/archives//html/TenTec/2003-04/msg00529.html (10,635 bytes)

154. Re: [TenTec] Slightly OT: SSB vs AM (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Tue, 22 Apr 2003 11:38:23 -0500
The carrier and other sideband of AM make for simple detection. E.g. the crystal set, just a diode. The carrier does nothing but bias the diode detector, the other sideband is just the result of the
/archives//html/TenTec/2003-04/msg00599.html (10,991 bytes)

155. Re: [TenTec] Slightly OT: SSB vs AM (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Tue, 22 Apr 2003 13:23:45 -0500
Generally the divide by 10 circuit looses amplitude information. And the spectral compression depends on considering that the SSB signal can be approximated by sampling the instantaneous frequency ev
/archives//html/TenTec/2003-04/msg00601.html (11,545 bytes)

156. Re: [TenTec] My second Ten Tec is a Triton IV. (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Thu, 24 Apr 2003 15:10:08 -0500
Needs some RF filtering else it will trigger on the least amount of RF in the shack. And needs some resistor from SCR gate to ground to accommodate the rounded knee of the standard zener. Often the z
/archives//html/TenTec/2003-04/msg00658.html (9,572 bytes)

157. Re: [TenTec] DSP reports--suggestion/request (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Tue, 29 Apr 2003 13:50:35 -0500
I use my Timewave 599+ with my Corsair II. Its an enhancement even on SSB sometimes. As for AGC, its AGC will overcome AGC pumping in the radio at the cost of bringing up the background noise between
/archives//html/TenTec/2003-04/msg00796.html (9,408 bytes)

158. Re: [TenTec] DSP reports--suggestion/request (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Tue, 29 Apr 2003 20:24:52 -0500
There WILL be distortion of the voice when the signal reaches the DSP with noise a little stronger than the signal. The DSP can't recreate voice components that were under the noise at the D/A conver
/archives//html/TenTec/2003-04/msg00815.html (10,901 bytes)

159. Re: [TenTec] Re: Question about Jupiter/Argonaut v. 746 Pro (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Tue, 29 Apr 2003 20:24:57 -0500
I used an Icom 746 at FD last year. I didn't appreciate a couple of its features. With other stations close by (tens of feet) there was often a low frequency rumble in the headphones as if a train wa
/archives//html/TenTec/2003-04/msg00816.html (9,185 bytes)

160. Re: [TenTec] DSP reports--suggestion/request (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Wed, 30 Apr 2003 09:23:33 -0500
I might be favorably impressed with the Orion's performance, but for VHF/UHF and up, it wouldn't be the limiting factor. So I think money is better spent on antenna arrays and signal frequency amplif
/archives//html/TenTec/2003-04/msg00836.html (9,448 bytes)

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