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21. [Amps] Why hasn't solid state replaced tubes? (score: 188): Author: peter.chadwick at Zarlink.Com (peter.chadwick@Zarlink.Com); Date: Tue Mar 4 09:13:52 2003; Maritime specifications required -31dB rel PEP or -25dB rel tone at the full output. A number of commercial HF rigs in the 100 watt class that I was involved with were rated at -28dB rel PEP: they we; /archives//html/Amps/2003-03/msg00100.html (9,611 bytes)
22. [Amps] Why hasn't solid state replaced tubes? (score: 188): Author: peter.chadwick at Zarlink.Com (peter.chadwick@Zarlink.Com); Date: Fri Mar 7 05:20:00 2003; It is interesting that in landline SSB, IMD was measured by loading the channel with a noise signal: this had a 'slot' in the spectrum with no noise in it, and the IMD was measured as the amount of n; /archives//html/Amps/2003-03/msg00291.html (9,485 bytes)
23. [Amps] Re: COLLINS Engineering (score: 188): Author: peter.chadwick at Zarlink.Com (peter.chadwick@Zarlink.Com); Date: Mon Mar 24 04:59:36 2003; of Take your pick from Marconi, Racal, Redifon, Plessey (only up to about 1kW at HF), STC. Racal and Marconi and STC were big in the point to point stuff. Marconi were for a long time the naval suppl; /archives//html/Amps/2003-03/msg00806.html (7,658 bytes)
24. [Amps] HT power supplies? (score: 188): Author: peter.chadwick at Zarlink.Com (peter.chadwick@Zarlink.Com); Date: Mon Mar 24 12:38:30 2003; Have you checked the actual resonant frequency? My understanding of the tuned choke filter is that it should be tuned slightly higher in frequency. This makes the circuit look like a very much bigger; /archives//html/Amps/2003-03/msg00813.html (7,385 bytes)
25. [Amps] Filament Inrush Control (score: 188): Author: peter.chadwick at Zarlink.Com (peter.chadwick@Zarlink.Com); Date: Wed Mar 26 04:54:42 2003; I guess from that you don't have any YL contest ops down there! Considering the operating abilities of some of the YL ops (such as Ann, WA1S, who really is a superb contest and DXpedition operator) t; /archives//html/Amps/2003-03/msg00838.html (8,529 bytes)
26. [Amps] Parasites (parasitics) (score: 188): Author: peter.chadwick at Zarlink.Com (peter.chadwick@Zarlink.Com); Date: Thu Mar 27 11:27:35 2003; Just to complicate the issue, I've seen a number of transmitters where very effective parasitic suppression was achieved with a 100 ohm 50 watt carbon stick resistor sitting with one end attached to; /archives//html/Amps/2003-03/msg00873.html (8,648 bytes)
27. [Amps] Parasites (parasitics) (score: 188): Author: peter.chadwick at Zarlink.Com (peter.chadwick@Zarlink.Com); Date: Fri Mar 28 04:28:21 2003; If the plate circuit is tuned lower in frequency than the grid circuit, then it doesn't matter how much feedback capacity there is, the tube cannot oscillate. See Mr. Terman on the subject. Which is; /archives//html/Amps/2003-03/msg00903.html (8,032 bytes)
28. [Amps] 100 Watt WW resistor Voltages (score: 188): Author: peter.chadwick at Zarlink.Com (peter.chadwick@Zarlink.Com); Date: Tue Feb 4 11:52:01 2003; I've used a 100k vitreous enamelled w/w that is about 14 inches long at 3500v for some years, with no problems. I think it's about 150 or 200 watts: it's 1.5inches in diameter. 73 Peter G3RZP; /archives//html/Amps/2003-02/msg00072.html (6,740 bytes)
29. [Amps] Yaesu FL-1000 (score: 188): Author: peter.chadwick at Zarlink.Com (peter.chadwick@Zarlink.Com); Date: Fri Feb 28 07:37:09 2003; My father had one. It's a carcass on the floor of the workshop at the moment, awaiting resurrection - as it has been for about 17 years! A weakness is the variability of 6JS6s. They need a separate b; /archives//html/Amps/2003-02/msg00508.html (7,327 bytes)
30. [Amps] Dual 8877 Alpha 77S final query (score: 188): Author: peter.chadwick at Zarlink.Com (peter.chadwick@Zarlink.Com); Date: Fri Aug 1 12:32:41 2003; AND that's going to be an electricity bill! 73 Peter G3RZP; /archives//html/Amps/2002-09/msg00288.html (6,699 bytes)
31. [Amps] Powering 400w mobile amplifier... (score: 188): Author: peter.chadwick at Zarlink.Com (peter.chadwick@Zarlink.Com); Date: Fri Aug 1 07:50:46 2003; It might be a good idea before you start to check the vehicle manufacturer's recommendations on radio fits. Certainly over here, they've had recommendations for maximum power of radios in the vehicle; /archives//html/Amps/2002-09/msg00414.html (6,871 bytes)

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