- 1. [Amps] Power output drop (score: 1)
- Author: Mike Waters <mikewate@gmail.com>
- Date: Tue, 10 Sep 2013 20:03:43 -0500
- ` Anyone have an idea why the power output of my dual parallel 833C 160m amp often drops 200+ watts after several seconds? Re-tuning does not bring it back up to the initial output. Not that a drop f
- /archives//html/Amps/2013-09/msg00019.html (7,493 bytes)
- 2. Re: [Amps] Power output drop (score: 1)
- Author: Vic K2VCO <k2vco.vic@gmail.com>
- Date: Tue, 10 Sep 2013 18:29:17 -0700
- Does the line voltage droop when you transmit, causing a drop in filament voltage? Do you have ceramic capacitors in the tank circuit that heat up and detune the tank? Not that a drop from 1500 to 13
- /archives//html/Amps/2013-09/msg00021.html (8,254 bytes)
- 3. Re: [Amps] Power output drop (score: 1)
- Author: Mike Waters <mikewate@gmail.com>
- Date: Tue, 10 Sep 2013 20:35:17 -0500
- Thanks, Vic. Someone else (in a private e-mail) just suggested line voltage. I do monitor the filament voltage, but I should monitor the 240 VAC and look at the HV meter, too. There is a "too-long" r
- /archives//html/Amps/2013-09/msg00022.html (9,110 bytes)
- 4. Re: [Amps] Power output drop (score: 1)
- Author: Vic K2VCO <k2vco.vic@gmail.com>
- Date: Tue, 10 Sep 2013 18:50:02 -0700
- Yes, if it's the caps then retuning would bring it back up. I looked at the pix on your website and I see you have a bunch of 0.01 discs in parallel in series with the input. There is probably some h
- /archives//html/Amps/2013-09/msg00025.html (10,267 bytes)
- 5. Re: [Amps] Power output drop (score: 1)
- Author: Alek Petkovic <vk6apk@bigpond.com>
- Date: Wed, 11 Sep 2013 09:56:23 +0800
- It could be the loading padder cap/s. They may be getting warm and going open circuit. If that is the case, then no amount of retuning will bring the power back up. I make this suggestion because in
- /archives//html/Amps/2013-09/msg00026.html (10,075 bytes)
- 6. Re: [Amps] Power output drop (score: 1)
- Author: "Carl" <km1h@jeremy.mv.com>
- Date: Wed, 11 Sep 2013 10:05:01 -0400
- Tank circuit cap drifting should be mitigated by retuning and going open is very uncommon in US made caps. More likely a coupling cap, plate coke or its bypass. A .0047 is sufficient as coupling at 1
- /archives//html/Amps/2013-09/msg00033.html (10,144 bytes)
- 7. Re: [Amps] Power output drop (score: 1)
- Author: Mike Waters <mikewate@gmail.com>
- Date: Wed, 11 Sep 2013 16:14:52 -0500
- Hello Carl, Thank you, and you are right about the photos! I'm really sorry about that. I should delete the old photos before I answer anything else. The plate choke (From a Gates 1 kW AM BCB transmi
- /archives//html/Amps/2013-09/msg00049.html (9,229 bytes)
- 8. Re: [Amps] Power output drop (score: 1)
- Author: "Carl" <km1h@jeremy.mv.com>
- Date: Wed, 11 Sep 2013 20:24:02 -0400
- OK on the caps, etc Mike. One thing you can try is to get the power drop going good and then power down, chicken stick the HV and feel everything for heat. I dont think you mentioned the condition of
- /archives//html/Amps/2013-09/msg00054.html (10,265 bytes)
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