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1. [AMPS] Practical PI Nets (score: 1): Author: mike@g0mjw.freeserve.co.uk (G0MJW); Date: Tue, 2 May 2000 16:11:28 +0100; Good enough ? It is excellent. It can even measure a difference of 1pF reliably. I think the 0.01pF resolution is a bit optimistic and the calibration is not perfect on my version, but it is good eno; /archives//html/Amps/2000-05/msg00024.html (9,380 bytes)
2. [AMPS] 3-500Z grid to filament resistance? (score: 1): Author: mike@g0mjw.freeserve.co.uk (G0MJW); Date: Fri, 28 Apr 2000 08:46:38 +0100; It should be very high - with the valve "cold". With the valve warm, it will presumably be just like a diode and the resistance you measure will depend on the polarity. However, 11k is high enough a; /archives//html/Amps/2000-04/msg00177.html (7,809 bytes)
3. [AMPS] Re: Surge voltage, HV connectors. (score: 1): Author: mike@g0mjw.freeserve.co.uk (G0MJW); Date: Fri, 3 Mar 2000 08:11:22 -0000; kV. If 2.1 transmission It should not cause a problem if you sequence properly. Once the standing bias of the tube is flowing, I expect the supply will drop to a reasonable level. If you have enough; /archives//html/Amps/2000-03/msg00084.html (11,744 bytes)
4. [AMPS] Heavy Iron: 10-4 Good Buddy (score: 1): Author: mike@g0mjw.freeserve.co.uk (G0MJW); Date: Fri, 3 Mar 2000 08:14:08 -0000; Good idea. But if the commercial amps were made this way, the factory would go out of business. -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Administrative; /archives//html/Amps/2000-03/msg00085.html (7,732 bytes)
5. [AMPS] Mission Impossible (score: 1): Author: mike@g0mjw.freeserve.co.uk (G0MJW); Date: Mon, 6 Mar 2000 11:11:46 -0000; It was OK over here in the UK, but I was only on 10m. Signals from the USA were generally clean, but so many of them it was hard to find anywhere to operate. Signals from the East of my location wer; /archives//html/Amps/2000-03/msg00222.html (8,170 bytes)
6. [AMPS] Misc. Oscillations (score: 1): Author: mike@g0mjw.freeserve.co.uk (G0MJW); Date: Mon, 6 Mar 2000 11:15:11 -0000; With the exception of the 2C39A that is generally over run in amateur service. I have measured many 4CX250 industrial pulls and they were nearly all low emission. They still worked well enough. The; /archives//html/Amps/2000-03/msg00223.html (9,025 bytes)
7. [AMPS] IMDs (score: 1): Author: mike@g0mjw.freeserve.co.uk (G0MJW); Date: Mon, 6 Mar 2000 12:14:51 -0000; I happened to have an FT690R on the bench and the posts regarding IMDs prompted me to look at the results from a "typical" solid state driver. The FT690R is not renound for its quality output but I e; /archives//html/Amps/2000-03/msg00230.html (9,908 bytes)
8. [AMPS] IMDs (score: 1): Author: mike@g0mjw.freeserve.co.uk (G0MJW); Date: Mon, 6 Mar 2000 13:40:52 -0000; No. no. Not that type of ALC. The tones were set to just give full output with the ALC off. There is an internal ALC that controls the gain of the transmitter. It is not compression as it is low pas; /archives//html/Amps/2000-03/msg00237.html (8,985 bytes)
9. [AMPS] IMDs (score: 1): Author: mike@g0mjw.freeserve.co.uk (G0MJW); Date: Mon, 6 Mar 2000 17:53:49 -0000; That may be - but it is a totally pointless statement considering it was an FT690... -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Administrative requests: a; /archives//html/Amps/2000-03/msg00255.html (8,594 bytes)
10. [AMPS] SSB interference (score: 1): Author: mike@g0mjw.freeserve.co.uk (G0MJW); Date: Mon, 6 Mar 2000 17:57:55 -0000; Many Ks worth of test equipment will give a quantitative result rather than a qualitative one. Is it possible that some of the IMDs were generated deliberately ? -- FAQ on WWW: http://www.contesting; /archives//html/Amps/2000-03/msg00256.html (8,012 bytes)
11. [AMPS] Re: New G2DAF amplifier information (score: 1): Author: mike@g0mjw.freeserve.co.uk (G0MJW); Date: Mon, 27 Mar 2000 08:09:31 +0100; For all those interested. Here is how to stop the endless discussion on G2DAF in outlook express. Go into Tools, Message Rules, Mail. Select subject contains, select action delete, change search text; /archives//html/Amps/2000-03/msg00979.html (8,701 bytes)
12. [AMPS] Swinging Choke Theory (score: 1): Author: mike@g0mjw.freeserve.co.uk (G0MJW); Date: Tue, 28 Mar 2000 08:11:58 +0100; This is a multi-part message in MIME format. --=_NextPart_000_0016_01BF988D.49FD7020 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable As to whether the best; /archives//html/Amps/2000-03/msg00996.html (14,596 bytes)
13. [AMPS] Northrup and the 3/2 law (score: 1): Author: mike@g0mjw.freeserve.co.uk (G0MJW); Date: Wed, 29 Mar 2000 08:24:21 +0100; What are you talking about for those of us not well versed in aeronautical engineering and what has it got to do with amplifiers ? -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions:; /archives//html/Amps/2000-03/msg01034.html (7,233 bytes)
14. [AMPS] Ameritron ALS600 (score: 1): Author: mike@g0mjw.freeserve.co.uk (G0MJW); Date: Mon, 14 Feb 2000 08:43:04 -0000; Kenwood The problem is not with your amplifier - it is with your TS450. I suggest fixing or replacing it. If you supply a negative voltage to the ALC input of the TS450, so that it delivers the powe; /archives//html/Amps/2000-02/msg00230.html (7,554 bytes)
15. [AMPS] RE: ALC (score: 1): Author: mike@g0mjw.freeserve.co.uk (G0MJW); Date: Wed, 16 Feb 2000 08:37:00 -0000; You do not need ALC with some of the latest rigs as driver. If a linear needs,say, 50 watts you just program the output to 50 watts in the menu and thats it. Any comments? Yes. You sometimes get the; /archives//html/Amps/2000-02/msg00276.html (7,977 bytes)
16. [AMPS] Blow TL922 (score: 1): Author: mike@g0mjw.freeserve.co.uk (G0MJW); Date: Thu, 24 Feb 2000 16:36:26 -0000; bias, relay? That was what I thought too, but the 3-500Z is a zero bias tube, so it would be unlikely to take 500mA even if the grid was grounded. I surmise there has been an arc, this has blown the; /archives//html/Amps/2000-02/msg00552.html (9,051 bytes)
17. [AMPS] Blow TL922 (score: 1): Author: mike@g0mjw.freeserve.co.uk (G0MJW); Date: Fri, 25 Feb 2000 11:25:09 -0000; The zener diode can be replaced with a series of c. 7, 1A forward-biased diodes. Such an arrangement is much more rugged than a zener. And also poor regulation - Does it really matter ? If you are do; /archives//html/Amps/2000-02/msg00569.html (8,504 bytes)
18. [AMPS] 50MHz Amp Details (score: 1): Author: Mike@g0mjw.freeserve.co.uk (Mike Willis); Date: Mon, 3 Jan 2000 18:21:45 -0000; beast? It is entirely possible. I built one. However, if you age going for a PI-L type circuit, you really need to ensure the absolute minimum anode capacitance. I have done away with anode tuning a; /archives//html/Amps/2000-01/msg00042.html (7,817 bytes)
19. [AMPS] abnormallly high plate current (score: 1): Author: Mike@g0mjw.freeserve.co.uk (Mike Willis); Date: Thu, 6 Jan 2000 11:10:49 -0000; What is the bias voltage ? Have you tuned it up properly and are both meter shunts still the correct resistance ? -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.co; /archives//html/Amps/2000-01/msg00141.html (8,662 bytes)
20. [AMPS] abnormallly high plate current (score: 1): Author: Mike@g0mjw.freeserve.co.uk (Mike Willis); Date: Thu, 6 Jan 2000 19:07:21 -0000; 5.22 Volts is 0.22V too high. You should consider fixing this as tube life is affected greatly by filament voltage. The 100mA bias is OK. A little high perhaps but quite within spec. You have 3500V,; /archives//html/Amps/2000-01/msg00165.html (10,060 bytes)

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