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301. Re: [Amps] confused reading amidon ferrite specs? (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Tue, 7 Mar 2006 10:18:08 -0800
Are seller's claims based on QRP testing to be trusted over the ferrite manufacturer's specs? Rich Measures, 805.386.3734, AG6K, www.somis.org _______________________________________________ Amps mai
/archives//html/Amps/2006-03/msg00179.html (12,533 bytes)

302. Re: [Amps] confused reading amidon ferrite specs? (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Tue, 7 Mar 2006 10:49:15 -0800
Agreed. Waveform distortion is the result of of a combination of too many Webers and too much f. I don't remember the details, Jim, however, as I recall it was a 2.4" mix-61, mu=125, core for a 450-o
/archives//html/Amps/2006-03/msg00180.html (9,254 bytes)

303. Re: [Amps] confused reading amidon ferrite specs? (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Wed, 8 Mar 2006 05:06:44 -0800
Yes, however the fly in the pie for mu=40 material is whether or not a winding that has sufficient L for 1.8MHz will not have too much C for 55MHz. I think the generator end is the place to start fro
/archives//html/Amps/2006-03/msg00192.html (11,708 bytes)

304. Re: [Amps] Pin Diodes (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Wed, 8 Mar 2006 05:15:59 -0800
Quite true, but 2mS R/T, T/R switching is not exactly lethargic. Does Alpha use a speedup circuit with their vacuum relays? Rich Measures, 805.386.3734, AG6K, www.somis.org __________________________
/archives//html/Amps/2006-03/msg00193.html (8,646 bytes)

305. Re: [Amps] mdc hv capacitors indentifcation (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Wed, 8 Mar 2006 08:44:52 -0800
chortle They are also okay for coupling / DC blockers. N750 also works okay in tuned circuits. Rich Measures, 805.386.3734, AG6K, www.somis.org _______________________________________________ Amps ma
/archives//html/Amps/2006-03/msg00204.html (7,712 bytes)

306. Re: [Amps] Pin Diodes (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Wed, 8 Mar 2006 08:57:40 -0800
The Jennings catalog is another source of speedup circuits. The basic theory behind the technique is to quickly overcome the 0.7H of L in the RJ-1A or HC-1 by applying additional V at turn on in orde
/archives//html/Amps/2006-03/msg00206.html (9,173 bytes)

307. Re: [Amps] ripple in HV ps (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Wed, 8 Mar 2006 09:05:26 -0800
A 4-1000A / 8166 with a 60 Hz, FWB, 7000v PS, using a 2uF filter C produces no detectable ripple on a SSB signal. Rich Measures, 805.386.3734, AG6K, www.somis.org ____________________________________
/archives//html/Amps/2006-03/msg00207.html (7,651 bytes)

308. Re: [Amps] Pin Diodes (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Wed, 8 Mar 2006 09:27:51 -0800
What is the measured make time for a RJ-1A? Rich Measures, 805.386.3734, AG6K, www.somis.org _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contest
/archives//html/Amps/2006-03/msg00211.html (10,090 bytes)

309. Re: [Amps] Parasitic Suppressor 4-1000A (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Thu, 9 Mar 2006 08:57:20 -0800
Mike -- The VHF parasite suppressor you described probably has a Q of c. 5 at the anode's self resonance. In my experiences, a suppressor with a Q of c. 1.5 will provide fewer fireworks than conventi
/archives//html/Amps/2006-03/msg00232.html (8,874 bytes)

310. Re: [Amps] Parasitic Suppressor 4-1000A (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Fri, 10 Mar 2006 03:31:16 -0800
The optimal suppressor design is that which almost melts down the suppressor resistor at 29MHz, Adding L increases dissipation at 29MHz, decreases the parallel-equivalent resistance seen by the anode
/archives//html/Amps/2006-03/msg00242.html (9,335 bytes)

311. Re: [Amps] Parasitic Suppressor 4-1000A (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Fri, 10 Mar 2006 10:18:47 -0800
Heat dissipation at 29MHz is a fair indicator of whether or not it will adequately suppress VHF energy. If a VHF suppressor does not get hellishly hot at 29MHz, it is unlikely to absorb energy above
/archives//html/Amps/2006-03/msg00247.html (10,851 bytes)

312. Re: [Amps] Observations on a Pi-L tank (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Sat, 11 Mar 2006 03:47:44 -0800
Scott -- Due to skin effect, the current carrying ability of round conductors at HF is c. 20% of that at DC. Rich Measures, 805.386.3734, AG6K, www.somis.org _________________________________________
/archives//html/Amps/2006-03/msg00265.html (10,683 bytes)

313. Re: [Amps] Parasitic Suppressor 4-1000A (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Sat, 11 Mar 2006 04:11:37 -0800
On Mar 10, 2006, at 1:19 PM, Steve Thompson wrote: R; Measures wrote: If a VHF suppressor does not get hellishly hot at 29MHz, it is unlikely to absorb energy above 30MHz . Depending on how much ener
/archives//html/Amps/2006-03/msg00266.html (10,673 bytes)

314. Re: [Amps] Parasitic Suppressor 4-1000A (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Sat, 11 Mar 2006 04:24:22 -0800
Indeed, Peter, and increasing series-R decreases parallel-equivalent R - which decreases amplification, which ameliorates the negative effect of the electron tube's C-feedback, and that is what VHF s
/archives//html/Amps/2006-03/msg00268.html (8,463 bytes)

315. Re: [Amps] Parasitic Suppressor 4-1000A (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Mon, 13 Mar 2006 01:46:58 -0800
Getting from series-R to parallel-equivalent-R is not as simple as it first looks. -- see page 27, March, 1989 *QST*, "Calculating Power Dissipation in Parasitic Suppressor Resistors". cheerz, Steve
/archives//html/Amps/2006-03/msg00319.html (9,400 bytes)

316. Re: [Amps] Proof of idiocy (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Mon, 13 Mar 2006 08:50:52 -0800
The threads are 1/4 - 23 -- for which taps and dies are available. Rich Measures, 805.386.3734, AG6K, www.somis.org _______________________________________________ Amps mailing list Amps@contesting.c
/archives//html/Amps/2006-03/msg00328.html (9,107 bytes)

317. Re: [Amps] Proof of idiocy (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Tue, 14 Mar 2006 02:56:45 -0800
Rich Measures, 805.386.3734, AG6K, www.somis.org _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2006-03/msg00358.html (10,761 bytes)

318. Re: [Amps] CHASSIS (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Wed, 15 Mar 2006 12:45:11 -0800
Eeeuwww, Rex. How totally embareASSing! For cheapo guys like me like me, who could not care less about impressing visitors, screwed and glued douglas-fir plywood makes pretty good $ense. Rich Measure
/archives//html/Amps/2006-03/msg00399.html (7,934 bytes)

319. Re: [Amps] Boat-Anchor Cleanliness (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Wed, 15 Mar 2006 13:37:49 -0800
Harold -- #30 phosphor-bronze wire, and black dacron (because its low D-factor makes it a good RF-insulator) sailmaker's thread can be used to construct a virtually invisible end-fed antenna that can
/archives//html/Amps/2006-03/msg00405.html (9,299 bytes)

320. Re: [Amps] Boat-Anchor Cleanliness (score: 1)
Author: R@contesting.com;Measures <r@somis.org>
Date: Wed, 15 Mar 2006 13:40:25 -0800
On Mar 15, 2006, at 12:53 PM, TexasRF@aol.com wrote: Hal, I am absolutely in awe of a man having a wife that makes all that acceptable. It is a scenario that the rest of us can only fantasize about!
/archives//html/Amps/2006-03/msg00406.html (12,775 bytes)

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