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References: [ +from:sm0aom@telia.com: 206 ]

Total 206 documents matching your query.

121. Re: [Amps] 3-500Z convertion (score: 1)
Author: Karl-Arne Markstr&ouml;m <sm0aom@telia.com>
Date: Tue, 25 Jul 2006 11:14:59 +0200
It was actually Jan-Erik SM2EKM (the other SM list member with a double first name) that wrote that. The 4X500 is very much a FM/TV transmitter tube (valve). They were extensively used in the first g
/archives//html/Amps/2006-07/msg01067.html (10,332 bytes)

122. Re: [Amps] "Tubes 201" - How Vacuum Tubes Really Work (score: 1)
Author: Karl-Arne Markstr&ouml;m <sm0aom@telia.com>
Date: Tue, 25 Jul 2006 12:10:34 +0200
This was the subject of considerable discussion in the VHF community in the 50's. It appears that the outcome was that the increase of interelectrode capacitances by paralleling two sections offset t
/archives//html/Amps/2006-07/msg01072.html (12,211 bytes)

123. Re: [Amps] Fw: "Tubes 201" - How Vacuum Tubes Really Work (score: 1)
Author: Karl-Arne Markstr&ouml;m <sm0aom@telia.com>
Date: Wed, 26 Jul 2006 13:19:33 +0200
I can say for sure, as an eye-witness, that testing the overload "crow-bar" in Telefunken 100 kW transmitters (RS 1896) using a 0,2 mm silver wire takes a lot of courage... Otherwise, the botton line
/archives//html/Amps/2006-07/msg01156.html (15,676 bytes)

124. Re: [Amps] conversion scale from dbu to microvolts (score: 1)
Author: Karl-Arne Markstr&ouml;m <sm0aom@telia.com>
Date: Sat, 29 Jul 2006 16:12:01 +0200
dBu is a measure of voltage, expressed as dB relative to 1 microvolt. There is one major problem with this expression, as it also has to be referred to the termination. It can be either "dBu EMF" whi
/archives//html/Amps/2006-07/msg01290.html (9,943 bytes)

125. Re: [Amps] conversion scale from dbu to microvolts (score: 1)
Author: Karl-Arne Markstr&ouml;m <sm0aom@telia.com>
Date: Sat, 29 Jul 2006 18:28:45 +0200
In a radio context, the proper use of dBu is as a field strength value, where 0 dBu corresponds to a field strength of 1 microvolt/meter It appears that dBu and dBuV are used interchangeably in at le
/archives//html/Amps/2006-07/msg01305.html (10,917 bytes)

126. Re: [Amps] Grid Vs cathode drive (score: 1)
Author: Karl-Arne Markstr&ouml;m <sm0aom@telia.com>
Date: Fri, 4 Aug 2006 13:13:42 +0200
Actually, they (=FCC) did. The original "Citizen's Band" in 1946/47 was around 465 MHz. We would have been spared a lot of trouble if it had stayed there. 73/ Karl-Arne SM0AOM ______________________
/archives//html/Amps/2006-08/msg00137.html (10,488 bytes)

127. Re: [Amps] Parasitics & Filament Sag (score: 1)
Author: Karl-Arne Markstrm <sm0aom@telia.com>
Date: Mon, 4 Sep 2006 19:25:31 +0200
Peter is certainly right. I vividly remember a "dreaded" University professor that still required the late 70's electronics engineering student to account in detail for the six cases of "resonance" t
/archives//html/Amps/2006-09/msg00073.html (14,431 bytes)

128. Re: [Amps] Technical specification question, possibly OT ! (score: 1)
Author: Karl-Arne Markstr&ouml;m <sm0aom@telia.com>
Date: Mon, 11 Sep 2006 21:33:32 +0200
At least in my opinion it is certainly somewhat odd to test HF equipment according to specifications for 25 kHz channel spacing, which normally is used for VHF/UHF FM equipment. However, it is quite
/archives//html/Amps/2006-09/msg00182.html (11,718 bytes)

129. Re: [Amps] Technical specification question, possibly OT ! (score: 1)
Author: <sm0aom@telia.com>
Date: Tue, 12 Sep 2006 12:43:07 +0200 (MEST)
The document I'm referring to is the CEPT/ERC/REC 74-01Ewhich can be found at: http://www.ero.dk/D57F2E8A-A18B-4E43...B02?frames=no& In Annex 6 was the Amateur Service specifically mentioned. I only
/archives//html/Amps/2006-09/msg00194.html (8,767 bytes)

130. Re: [Amps] Kilovac HC-2 Mounting Nut (score: 1)
Author: Karl-Arne Markstr&ouml;m <sm0aom@telia.com>
Date: Fri, 15 Sep 2006 18:32:20 +0200
If I recall correctly, the M14x1.5-6g is the Metric fine thread used on pressure gauges and similar hydraulic/pneumatic hardware in Europe. Can you measure the actual dimensions and pitch of the thre
/archives//html/Amps/2006-09/msg00203.html (8,977 bytes)

131. Re: [Amps] "10 Meter Ban" to be lifted ... (score: 1)
Author: Karl-Arne Markstr&ouml;m <sm0aom@telia.com>
Date: Sun, 15 Oct 2006 13:00:06 +0200
For unprocessed speech, the CCIR long ago established an 8 dB peak/average ratio. This may be on the low side, as I have seen 9 and even 10 dB ratios in literature about FDM carrier system loading. U
/archives//html/Amps/2006-10/msg00136.html (12,492 bytes)

132. Re: [Amps] 3CPX vs 3CX tubes (score: 1)
Author: Karl-Arne Markstr&ouml;m <sm0aom@telia.com>
Date: Sat, 21 Oct 2006 08:58:15 +0200
In the mid 80's the use of the 3CPX1500A7 in linear amplifier service was investigated in connection of "re-tubing" a commercial MF/HF amplifier. The outcome was that it would have permitted higher p
/archives//html/Amps/2006-10/msg00222.html (9,429 bytes)

133. Re: [Amps] Mega Amplifier? (score: 1)
Author: Karl-Arne Markstr&ouml;m <sm0aom@telia.com>
Date: Sun, 5 Nov 2006 11:18:06 +0100
This may be part of a Kalmus distributed amplifier. I recall being shown a similar unit when visiting the Kalmus plant at Kirkland WA in the mid 80's. Regarding the Marconi H1000 distributed amplifie
/archives//html/Amps/2006-11/msg00073.html (9,386 bytes)

134. Re: [Amps] TMC AMP (score: 1)
Author: Karl-Arne Markstr&ouml;m <sm0aom@telia.com>
Date: Mon, 4 Dec 2006 20:39:15 +0100
This fits in on the TMC SBT-1K which has been discussed in http://lists.contesting.com/_amps/1998-12/msg00373.html It uses the PL-172/8295 pentode. The amplifier seems to be of similar construction a
/archives//html/Amps/2006-12/msg00018.html (8,183 bytes)

135. Re: [Amps] Optoisolator for Keying Collins 30L-1 to Modern Rigs (score: 1)
Author: Karl-Arne Markstr&ouml;m <sm0aom@telia.com>
Date: Sat, 9 Dec 2006 13:53:57 +0100
For simplicity, I would suggest the use of the Clare PLA140 opto-isolated "solid state relay". It can hold off more than 300 VDC and has a current rating of 200 mA. Switching times are in the 0,5 ms
/archives//html/Amps/2006-12/msg00047.html (10,261 bytes)

136. Re: [Amps] 807 transmitter (score: 1)
Author: Karl-Arne Markstr&ouml;m <sm0aom@telia.com>
Date: Mon, 5 Feb 2007 21:51:46 +0100
It appears that your tank coil inductance is too high. For an operating Q of 12 the tank circuit capacitance would be in the 180 - 200 pF range and the associated inductance in the 8.5 - 9 uH range (
/archives//html/Amps/2007-02/msg00056.html (8,528 bytes)

137. Re: [Amps] drive power (score: 1)
Author: Karl-Arne Markstr&ouml;m <sm0aom@telia.com>
Date: Sat, 17 Mar 2007 16:15:19 +0100
The drive power ratings for different circuits (grid-driven and cathode-driven) may look confusing. In the grid-driven AB1 circuit, you only need drive voltage which corresponds to sufficient power t
/archives//html/Amps/2007-03/msg00199.html (11,126 bytes)

138. Re: [Amps] AL1500 PSU design (score: 1)
Author: Karl-Arne Markstr&ouml;m <sm0aom@telia.com>
Date: Tue, 12 Jun 2007 10:01:57 +0200
Since at every instant, the reverse voltage in the Graetz bridge circuit is divided over two series connected rectifier elements (2 x 5 1N5408's in this case), there is a small safety margin. Substit
/archives//html/Amps/2007-06/msg00076.html (11,139 bytes)

139. Re: [Amps] Collins 8020 Amplifier (score: 1)
Author: Karl-Arne Markstr&ouml;m <sm0aom@telia.com>
Date: Thu, 21 Jun 2007 12:16:21 +0200
The Rockwell/Collins HF-8020 + HF-8030 PS was the first HF amplifier in the HF-80 system. It was introduced in the late 70's. A later solid-state system was the HF-8023 + HF-8032 PS which is early 80
/archives//html/Amps/2007-06/msg00107.html (9,742 bytes)

140. Re: [Amps] Henry 3K Classic stby. Input Power? (score: 1)
Author: Karl-Arne Markstr&ouml;m <sm0aom@telia.com>
Date: Wed, 27 Jun 2007 11:22:24 +0200
Are you sure that you are measuring "active power (= U*I * cos (fi))" when in standby? The power factor of an idling capacitor input power supply can be quite low. 73/ Karl-Arne SM0AOM ______________
/archives//html/Amps/2007-06/msg00149.html (8,492 bytes)

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