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Total 35 documents matching your query.

1. [Amps] Why does power output increase? (score: 1): Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>; Date: Sat, 4 Jun 2022 12:35:45 +0300; This isn't a problem, just a phenomenon that I would like to understand. I have a TL922. Mods include directly grounded grids. I also measured the filament voltage with my Fluke true RMS meter and pu; /archives//html/Amps/2022-06/msg00000.html (7,038 bytes)
2. [Amps] Why does power output increase? (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Sat, 4 Jun 2022 05:43:05 -0500; Could be one or more things. Component in input network of amp heating and changing value. Component in output (fixed value loading padder cap) heating up and changing value. Something in the antenna; /archives//html/Amps/2022-06/msg00001.html (7,462 bytes)
3. Re: [Amps] Why does power output increase? (score: 1): Author: MU 4CX250B <4cx250b@miamioh.edu>; Date: Sat, 4 Jun 2022 12:03:23 +0000; Victor, do you notice any change in the resting plate current? I dont recall the circuitry of the TL922, but its possible the operating bias point has changed if there is a zener diode in the cathode; /archives//html/Amps/2022-06/msg00002.html (9,857 bytes)
4. Re: [Amps] Why does power output increase? (score: 1): Author: Alek Petkovic <vk6apk@bigpond.com>; Date: Sat, 4 Jun 2022 19:54:01 +0800; Yes. I agree. Here in VK6, many years ago, many of us were lucky enough to come by some TMC Intermediate Power Amplifier units from the GPT10K transmitters, which were used at the US Navy communicati; /archives//html/Amps/2022-06/msg00003.html (10,605 bytes)
5. Re: [Amps] Why does power output increase? (score: 1): Author: Shane Youhouse <kd6vxi@gmail.com>; Date: Sat, 4 Jun 2022 08:23:29 -0400; Vic, 1. You want 5.0 volts under full bore TX, not at receive. 2. I'd suspect the filament primary resistor. If it's heating up and dropping resistance, more current will be allowed through. This wil; /archives//html/Amps/2022-06/msg00004.html (9,473 bytes)
6. Re: [Amps] Why does power output increase? (score: 1): Author: Adrian <a.fewster@optusnet.com.au>; Date: Sat, 4 Jun 2022 22:32:53 +1000; That's a good take on a likely reason. A voltmeter across the resistor then monitored, would confirm it, if VD drops. vk4tux 1. You want 5.0 volts under full bore TX, not at receive. 2. I'd suspect t; /archives//html/Amps/2022-06/msg00005.html (9,819 bytes)
7. Re: [Amps] Why does power output increase? (score: 1): Author: gudguyham--- via Amps <amps@contesting.com>; Date: Sat, 4 Jun 2022 13:26:32 +0000 (UTC); I agree with Shane and was exactly my thought, however resistors usually go up in value when they get hot. I would get rid if that resistor faster than you can say Rumpelstiltskin. Sent from the a; /archives//html/Amps/2022-06/msg00006.html (10,866 bytes)
8. Re: [Amps] Why does power output increase? (score: 1): Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>; Date: Sat, 4 Jun 2022 16:43:23 +0300; The power increases after I transmit for a while. Then if I leave the amp on standby, it goes back to what it was before. But this resistor has the same current through it whenever the amp is on. If; /archives//html/Amps/2022-06/msg00007.html (12,356 bytes)
9. Re: [Amps] Why does power output increase? (score: 1): Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>; Date: Sat, 4 Jun 2022 16:51:26 +0300; 1. I have often wondered whether the filament voltage should be measured under full power or in standby. I operate CW only, so even during a transmission, 50% of the time the voltage is at the key up; /archives//html/Amps/2022-06/msg00008.html (11,187 bytes)
10. Re: [Amps] Why does power output increase? (score: 1): Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>; Date: Sat, 4 Jun 2022 16:57:50 +0300; I will check the resting plate current. My bias circuit has been modified to cut off the tubes in key up. There is a zener, and there are some other components that might be changing value, so that's; /archives//html/Amps/2022-06/msg00009.html (11,424 bytes)
11. Re: [Amps] Why does power output increase? (score: 1): Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>; Date: Sat, 4 Jun 2022 17:06:19 +0300; The input network is a possibility. Wattmeters are a possibility, though I've noticed this with two different ones. No lowpass filter. There are no traps or inductors/capacitors in the transmission l; /archives//html/Amps/2022-06/msg00010.html (10,096 bytes)
12. Re: [Amps] Why does power output increase? (score: 1): Author: MU 4CX250B <4cx250b@miamioh.edu>; Date: Sat, 4 Jun 2022 14:18:50 +0000; Victor, I believe low filament voltage is much worse than high filament voltage, at least for tubes with indirectly heated cathodes. I formed this belief after losing the tube in one of my HB amps wh; /archives//html/Amps/2022-06/msg00011.html (12,735 bytes)
13. [Amps] Why does power output increase? (score: 1): Author: "jim.thom jim.thom@telus.net" <jim.thom@telus.net>; Date: Sat, 4 Jun 2022 08:35:10 -0700; CW (low voltage). IE: put xcvr on SSB, mic gain on zero, key the PTT. INcrease, not decrease. Tube emission would decrease. PO would drop, not increase. Even this doesn't make sense. Typ, when zeners; /archives//html/Amps/2022-06/msg00012.html (9,107 bytes)
14. Re: [Amps] Why does power output increase? (score: 1): Author: Jim W7RY <jimw7ry@gmail.com>; Date: Sat, 4 Jun 2022 22:19:36 -0500; *I'm curious Vic...* *See below"* On 6/4/2022 4:35 AM, Victor Rosenthal 4X6GP wrote: This isn't a problem, just a phenomenon that I would like to understand. I have a TL922. Mods include directly gro; /archives//html/Amps/2022-06/msg00017.html (10,391 bytes)
15. Re: [Amps] Why does power output increase? (score: 1): Author: Jim W7RY <jimw7ry@gmail.com>; Date: Sat, 4 Jun 2022 22:23:09 -0500; No fixed loading caps in a TL-922 OUTPUT on 20 meters... The tuned input is another matter though.. 73, Jim W7RY On 6/4/2022 7:03 AM, MU 4CX250B wrote: Victor, do you notice any change in the resting; /archives//html/Amps/2022-06/msg00018.html (11,253 bytes)
16. Re: [Amps] Why does power output increase? (score: 1): Author: Jim W7RY <jimw7ry@gmail.com>; Date: Sat, 4 Jun 2022 22:25:04 -0500; W8JI has some filament voltage measurements for the AL80B on his web site and how he measured it under load. 73. Jim W7RY On 6/4/2022 8:51 AM, Victor Rosenthal 4X6GP wrote: 1. I have often wondered w; /archives//html/Amps/2022-06/msg00019.html (13,311 bytes)
17. Re: [Amps] Why does power output increase? (score: 1): Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>; Date: Sun, 5 Jun 2022 13:55:56 +0300; This morning, for some reason, the phenomenon did not occur. I was getting close to 1400 watts the whole time. I always operate CW in the SSB position -- the warning in the manual against this is (I; /archives//html/Amps/2022-06/msg00023.html (11,755 bytes)
18. Re: [Amps] Why does power output increase? (score: 1): Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>; Date: Sun, 5 Jun 2022 14:04:32 +0300; I did measure the voltage at the tube pins. I haven't measured it while transmitting, because the RF drives my meter crazy. I assume the voltage drops a bit. Unfortunately I no longer have my trusty; /archives//html/Amps/2022-06/msg00025.html (11,984 bytes)
19. Re: [Amps] Why does power output increase? (score: 1): Author: gudguyham--- via Amps <amps@contesting.com>; Date: Sun, 5 Jun 2022 11:05:27 +0000 (UTC); If you rx filament voltage is around 5.25 thats ideal. Sent from the all new AOL app for iOS This morning, for some reason, the phenomenon did not occur. I was getting close to 1400 watts the whole t; /archives//html/Amps/2022-06/msg00026.html (12,788 bytes)
20. Re: [Amps] Why does power output increase? (score: 1): Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>; Date: Sun, 5 Jun 2022 14:35:20 +0300; Yes, I found it here: <https://www.w8ji.com/filament_voltage_life.htm> He notes that the Eimac specs for the 3-500Z call for 4.75-5.25v. What I should do is check my line voltage (it is usually prett; /archives//html/Amps/2022-06/msg00027.html (15,416 bytes)

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