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241. Re: [Amps] Ameritron QSK-5 Insertion Loss (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 12 Feb 2010 09:44:44 -0500
I should have also stated the loss was measured during transmit, not receive. Tnx. Paul, W9AC _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contes
/archives//html/Amps/2010-02/msg00341.html (10,162 bytes)

242. Re: [Amps] QSK-5 insertion loss... (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 12 Feb 2010 13:56:27 -0500
More investigation is needed as I came to the same calculated power dissipation for 1.5 dB of loss at 10m. I've validated my measurements on three separate devices into a Bird Terma-Line load but th
/archives//html/Amps/2010-02/msg00358.html (7,070 bytes)

243. Re: [Amps] QSK-5 insertion loss... (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 12 Feb 2010 15:12:20 -0500
Thanks, Phil. I've seen that specification from Ameritron and it prompted me to ask the loss question since it's not disclosed by Ameritron. When I see optional cooling fans being offered by manufact
/archives//html/Amps/2010-02/msg00361.html (9,333 bytes)

244. [Amps] Epilogue: Ameritron QSK-5 Insertion Loss (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sat, 13 Feb 2010 17:31:30 -0500
This afternoon, I conducted more comprehensive insertion loss testing through the Ameritron QSK-5. I confirmed that the result of the excessive loss is primarily due to the SPE's ATU being in-line, e
/archives//html/Amps/2010-02/msg00373.html (10,987 bytes)

245. Re: [Amps] Solenoid polarity on DC reed relays (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 10 Mar 2010 14:13:02 -0500
Bill, DC coil polarity is an issue because polarized relays generally contain a reverse-biased snubbing diode across the relay coil to: (1) protect a solid-state driving circuit from damage resulting
/archives//html/Amps/2010-03/msg00163.html (9,611 bytes)

246. Re: [Amps] Solenoid polarity on DC reed relays (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 10 Mar 2010 14:23:37 -0500
Jeff: That depends on the coil resistance. The resistance check may not work on relays with low coil resistance. Another check is to apply DC coil voltage with a current-limiting bench supply. Revers
/archives//html/Amps/2010-03/msg00165.html (9,730 bytes)

247. Re: [Amps] Solenoid polarity on DC reed relays (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 10 Mar 2010 14:39:47 -0500
I use a Viz triple-output bench supply for this kind of testing and I'm always crossing leads by mistake when bread-boarding something. The supply has an adjustable, electronically-switched current t
/archives//html/Amps/2010-03/msg00166.html (10,286 bytes)

248. Re: [Amps] Building 833 Amplifier. Hints and Suggestions? (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 17 Mar 2010 10:17:01 -0400
To stay within the current FCC power rule with asymmetrical voice modulation may require a carrier significantly less than the 200-250 range quoted, even with audio processing to control dynamic ran
/archives//html/Amps/2010-03/msg00330.html (9,277 bytes)

249. Re: [Amps] Building 833 Amplifier. Hints and Suggestions? (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 17 Mar 2010 11:06:09 -0400
And probably the reason why Array Solutions, Alpha, and N8LP seem to recognize a market for 5KW+ wattmeter couplers. If ops are utilizing 1KW AM broadcast transmitters to their full potential, they
/archives//html/Amps/2010-03/msg00338.html (9,583 bytes)

250. Re: [Amps] 'Good engineering' (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 26 Mar 2010 18:35:50 -0400
Canada has adopted a very progressive sets of rules for amateur-class service, particularly with respect to output power, occupied bandwidth, and license classes. If Canadian amateurs wish to fully e
/archives//html/Amps/2010-03/msg00675.html (9,056 bytes)

251. Re: [Amps] 'good engineering' (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sat, 27 Mar 2010 09:31:45 -0400
Bill, Nice looking amp. Are those Simpson panel meters on the RF unit? Also, I see a pair of yellow "tip" test jacks on the front panel. Are those used for filament V monitoring? Paul, W9AC _________
/archives//html/Amps/2010-03/msg00686.html (7,915 bytes)

252. Re: [Amps] gg (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 29 Mar 2010 22:50:58 -0400
My 23rd ed., 2nd printing shows a copyright date of 1987. Like prior editions of the ARRL Handbook and ARRL Antenna Book, the newest publications oftentimes omit important material contained in earli
/archives//html/Amps/2010-03/msg00838.html (8,924 bytes)

253. Re: [Amps] Semtech SA1388? (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 31 Mar 2010 16:26:16 -0400
"6824" could relate to the manufacturing date code of the 24th week of 1968, although I've not seen many four-digit date codes used on components before the mid '70s. Semtech was around in 1970 when
/archives//html/Amps/2010-03/msg00959.html (7,754 bytes)

254. Re: [Amps] liquid cooling (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 5 Apr 2010 13:11:17 -0400
actually get the water up to boiling, and _LOTS_ of energy is carried off in those steam bubbles. " With vapor-phase cooling, a rise in H2O temperature near the boiling point is fine, but heat trans
/archives//html/Amps/2010-04/msg00102.html (9,881 bytes)

255. Re: [Amps] liquid cooling (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 5 Apr 2010 13:51:32 -0400
That's the basis for the 1966 QST article entitled "The Stanley Steamer." That amp used only convection currents as the condenser was positioned horizontally and became a part of the top cabinet. Th
/archives//html/Amps/2010-04/msg00107.html (8,837 bytes)

256. Re: [Amps] liquid cooling (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 5 Apr 2010 17:02:52 -0400
It's a small extent until air contamination gradually reaches the point where conduction necessitates the purging of the H2O supply. There's a slight amount of evaporation through the vent tubes (at
/archives//html/Amps/2010-04/msg00123.html (9,022 bytes)

257. Re: [Amps] Liquid Cooling (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Tue, 6 Apr 2010 12:15:21 -0400
That should stay pure for a while! The Alpha Seventy's reservoir (topped-off tube boiler, condenser, and feed line) is roughly 700 mL (about 3 cups of H2O). The bottom of the condenser forms a large
/archives//html/Amps/2010-04/msg00153.html (8,989 bytes)

258. Re: [Amps] Liquid Cooling (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Tue, 6 Apr 2010 12:30:38 -0400
Correction to my last post -- typical leakage current of the Alpha Seventy is 200 uA @ 4KV. I had to get up out of my hair and re-confirm the leakage scale. It's at 1 mA where the "high leakage" sens
/archives//html/Amps/2010-04/msg00154.html (10,440 bytes)

259. Re: [Amps] Liquid Cooling (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Tue, 6 Apr 2010 12:33:11 -0400
It's a bad morning folks..."out of my chair" would make more sense. Paul, W9AC _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailm
/archives//html/Amps/2010-04/msg00155.html (7,957 bytes)

260. Re: [Amps] Electrolytic capacitor WV ratings (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 7 Apr 2010 09:46:39 -0400
Vic, In a typical amplifier power supply where a string of series electrolytics are used, the safety factor would be dependant on the equalized balance of voltage appearing across the terminals of e
/archives//html/Amps/2010-04/msg00191.html (7,691 bytes)

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