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Total 1055 documents matching your query.

301. Re: [TenTec] QSK - was Omni VI vs Orion (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Thu, 18 Jan 2007 18:23:51 -0600
Chirp city. Time delays worse the higher the oscillator tuned circuit Q, worst with a crystal. Vintage rigs like the Viking Ranger had a sequential keying scheme that held the PA off while the VFO or
/archives//html/TenTec/2007-01/msg00548.html (8,659 bytes)

302. Re: [TenTec] Omni VI Keyer Control Mod (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 19 Jan 2007 18:51:26 -0600
Shaft adapter for 1/4" knob on 1/8" shaft. Mouser (www.mouser.com) 506- KR1, 57 cents in single lots. I can't machine one for that. -- 73, Jerry, K0CQ, All content copyright Dr. Gerald N. Johnson, el
/archives//html/TenTec/2007-01/msg00598.html (9,055 bytes)

303. Re: [TenTec] mic (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 22 Jan 2007 11:19:57 -0600
The D-104 was made for AM with enhanced high frequencies back in the days when IF transformer made a receiver pass band that gently rolled off those highs. And the original crystal D-104 was made for
/archives//html/TenTec/2007-01/msg00667.html (7,945 bytes)

304. Re: [TenTec] AM Receiver distortion in Orion II (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Wed, 24 Jan 2007 17:52:17 -0600
NOT AT ALL! The words are wider which makes the dynamic range is greater but the 24 bit processor works one instruction per clock cycle just like the 16 bit processor. Sometimes the wide processor wo
/archives//html/TenTec/2007-01/msg00740.html (10,790 bytes)

305. Re: [TenTec] Omni V filter arrangement (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 26 Jan 2007 16:11:35 -0600
Same filters, same IFs as th Corair II. Different VFO scheme. Digital instead of analog. 73, Jerry, K0CQ _______________________________________________ TenTec mailing list TenTec@contesting.com http
/archives//html/TenTec/2007-01/msg00801.html (7,940 bytes)

306. Re: [TenTec] Corsair II and Shure 526T SeriesII quuestion (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 26 Jan 2007 16:15:01 -0600
Disconnect the amplifier in the microphone, feed the microphone element directly to the radio. You don't need that gain with ham gear, only with CB radios where they try to prevent modulation. 73, Je
/archives//html/TenTec/2007-01/msg00802.html (8,306 bytes)

307. Re: [TenTec] 75 Ohm twin velocity factor ? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 26 Jan 2007 16:26:23 -0600
That 83 ohm limit is untrue. Its where the conductors would have to overlap if you use the log formula which is only accurate above 200 ohms. The proper formula for all impedances and spacings that w
/archives//html/TenTec/2007-01/msg00804.html (10,894 bytes)

308. Re: [TenTec] 75 Ohm twin velocity factor ? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 26 Jan 2007 17:16:50 -0600
The inverse hyperbolic cosine formula is in some of the better reference books like the IT&T Radio Engineer's Handbook. Long about, about 1965, I got tired of not being allowed by the log formula to
/archives//html/TenTec/2007-01/msg00807.html (10,514 bytes)

309. Re: [TenTec] 75 Ohm twin velocity factor ? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 26 Jan 2007 17:43:32 -0600
My HP-15C that I keep in the drawer between this keyboard and monitor does have arccosh. I used to keep XACT on my packet computer, it emulates an HP11, I think. Runs in DOS. The scientific mode calc
/archives//html/TenTec/2007-01/msg00808.html (10,223 bytes)

310. Re: [TenTec] Station Grounding (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 26 Jan 2007 19:46:59 -0600
18" wide copper strap is better, lower inductance. With a band of 18" wide copper strap around the building or at least the room to be protected and with all ins and out going through Polyphasors mou
/archives//html/TenTec/2007-01/msg00819.html (10,804 bytes)

311. Re: [TenTec] Corsair II and Shure 526T SeriesII quuestion (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 26 Jan 2007 19:47:45 -0600
That's what I said a couple hours ago. 73, Jerry, K0CQ _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman/listinfo/tentec
/archives//html/TenTec/2007-01/msg00820.html (8,243 bytes)

312. Re: [TenTec] Antenna Problem (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 26 Jan 2007 19:50:46 -0600
A "current" balun is an impedance on the outside of the coax intended to reduce current on that surface. A coil of coax makes an inductance to accomplish the same thing. One uses a ferrite core, the
/archives//html/TenTec/2007-01/msg00821.html (7,810 bytes)

313. Re: [TenTec] 75 Ohm twin velocity factor ? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sat, 27 Jan 2007 10:59:46 -0600
How do you get that? I tried 0.1" diameter conductors 0.11" center to center and it comes up 53.2 ohms impedance. That's 0.010" gap, fairly closely spaced. Same conductors 0.105" center to center (0.
/archives//html/TenTec/2007-01/msg00843.html (11,565 bytes)

314. Re: [TenTec] 75 Ohm twin velocity factor ? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sat, 27 Jan 2007 11:02:20 -0600
Small, probably 1/4" for receiving line, 3/8" for transmitting line with 14 gauge conductors. 73, Jerry, K0CQ _______________________________________________ TenTec mailing list TenTec@contesting.com
/archives//html/TenTec/2007-01/msg00844.html (10,320 bytes)

315. Re: [TenTec] 75 Ohm twin velocity factor ? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sat, 27 Jan 2007 11:07:37 -0600
Generally the dielectric material in lamp cord is significantly more lossy at RF than real transmission lines. In the early days of ham use of transmission lines I've read that twisted rubber and clo
/archives//html/TenTec/2007-01/msg00845.html (10,040 bytes)

316. Re: [TenTec] Station Grounding (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sat, 27 Jan 2007 11:15:48 -0600
I prefer equipment and cattle survival and I have proven ground isolation is the solution in some cases, in court. Codes in question were created by committee, generally NFPA and adopted locally some
/archives//html/TenTec/2007-01/msg00846.html (9,143 bytes)

317. Re: [TenTec] Velocity factor (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sat, 27 Jan 2007 13:39:40 -0600
In a tune feeder application, the higher impedance ladder line often makes for more convenient tuning. The worst case for a tuner with a coax or 72 ohm twinlead feeder is where the dipole is one wave
/archives//html/TenTec/2007-01/msg00858.html (8,906 bytes)

318. Re: [TenTec] ORION2_HW-NOISE_BLANKER (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sat, 27 Jan 2007 19:14:00 -0600
Maybe but the way I understand it is that the blanker still sees the noise but while it blanks the receiver IF, it also chops holes (more like microsecond length than millisecond length) in the stron
/archives//html/TenTec/2007-01/msg00870.html (9,142 bytes)

319. Re: [TenTec] Station Grounding (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sat, 27 Jan 2007 20:21:57 -0600
When the "accepted rules of good engineering practice" are the CAUSE of injuries to dairy cows those rules need correcting. Ronk among others makes a ground isolating device for just such occasions.
/archives//html/TenTec/2007-01/msg00873.html (8,671 bytes)

320. Re: [TenTec] 75 Ohm twin velocity factor ? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sat, 27 Jan 2007 20:34:51 -0600
I think how the two 300 in parallel would show would depend on details of their construction and so the paralleled conductor spacing. A line with a good oval of solid plastic would come closer to hol
/archives//html/TenTec/2007-01/msg00874.html (13,015 bytes)

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