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1. [Amps] test new email address (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Thu, 8 May 2014 18:37:24 -0500
Testing my new email address for amps. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2014-05/msg00031.html (6,280 bytes)

2. Re: [Amps] Bird Slug Frequency Curves (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Thu, 29 May 2014 10:10:56 -0500
Hi Jim, I always thought that the higher power Bird slugs were more broad banded? As I remember that is what their charts show in the manual. It is interesting that you find that not so. How much of
/archives//html/Amps/2014-05/msg00140.html (9,675 bytes)

3. Re: [Amps] SB-200 input. (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Fri, 25 Jul 2014 21:57:24 -0500
It is always best to have the GG amplifiers tuned input circuit as close to the cathode as possible. There needs to be capacitance directly from the cathode to ground. A pi network input is ideal and
/archives//html/Amps/2014-07/msg00114.html (16,481 bytes)

4. Re: [Amps] Reducing heat in tetrode amps with EBS (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Thu, 30 Oct 2014 13:14:26 -0500
At first glance switching the bias at 1/2 watt input seems like a low value but if you have a 13 db gain amp that puts the output power at 10 watts during bias switching. That is only 20 db down from
/archives//html/Amps/2014-10/msg00259.html (13,405 bytes)

5. Re: [Amps] AL1200 on AM - max carrier? (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Thu, 30 Oct 2014 23:46:00 -0500
The legal limit on AM is 1500 watts PEP, just as it is for all other modes. There is no 375 watt carrier "limit" set by the FCC. But it does work out to 375 watts of carrier when you modulate to 100%
/archives//html/Amps/2014-10/msg00266.html (16,231 bytes)

6. Re: [Amps] AL1200 on AM - max carrier? (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Fri, 31 Oct 2014 13:30:53 -0500
My last post on this subject explained how to tune up for AM when using an SSB radio in the AM mode. If you are using an AM transmitter like a Johnson Ranger or other such vintage rigs as your excite
/archives//html/Amps/2014-10/msg00283.html (13,664 bytes)

7. [Amps] Input SWR revisited (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Mon, 12 Jan 2015 21:05:53 -0600
This afternoon I warmed up the HP vector network analyzer and tried a few things. First I calibrated analyzer port to 50 ohms. Then I put a 75 ohm load on it and it read 1.5:1 SWR as would be expecte
/archives//html/Amps/2015-01/msg00063.html (8,295 bytes)

8. Re: [Amps] Input SWR revisited (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Mon, 12 Jan 2015 21:25:34 -0600
I forgot to include that with just a 4 foot cable on the output of the tuner between tuner and 75 ohm load the SWR was 1.8:1. With the 10 foot cable SWR was 1.46:1. With the 10 foot and 4 foot cable
/archives//html/Amps/2015-01/msg00065.html (9,868 bytes)

9. Re: [Amps] Input SWR revisited (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Tue, 13 Jan 2015 12:42:16 -0600
Hi Paul, The VNA was calibrated at the VNA directional coupler port for 50 ohms without any cable attached. All cables used were 50 ohm. When using the 75 ohm load with no tuner the SWR always read 1
/archives//html/Amps/2015-01/msg00093.html (10,922 bytes)

10. Re: [Amps] The genius of ham radio (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Tue, 13 Jan 2015 14:07:41 -0600
Because it stores energy. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2015-01/msg00096.html (16,404 bytes)

11. Re: [Amps] Input SWR revisited (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Wed, 14 Jan 2015 13:57:07 -0600
It means that-- if you are looking at the SWR at your radio and there is a tuner after the SWR bridge, any changes in cable length after the tuner will show a change in SWR at the radio if you do not
/archives//html/Amps/2015-01/msg00107.html (9,694 bytes)

12. Re: [Amps] Input SWR revisited (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Wed, 14 Jan 2015 14:33:53 -0600
Yes Don, with a 1/4 wavelength of 75 ohm cable you will get an impedance transformation from 100 ohms to 50 ohms. If the cable is other than a quarter wavelength or multiple of you will have a differ
/archives//html/Amps/2015-01/msg00110.html (11,855 bytes)

13. Re: [Amps] Input SWR revisited (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Wed, 14 Jan 2015 17:06:46 -0600
Don, You are confusing what I said by throwing in the 75 ohm line. Look again what I wrote and remember that I said it was with all 50 ohm line. 73 Gary K4FMX ________________________________________
/archives//html/Amps/2015-01/msg00118.html (13,859 bytes)

14. Re: [Amps] Input SWR revisited (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Wed, 14 Jan 2015 21:09:52 -0600
Hi Jim, Good to hear from you again. Yet it is true! Some guys earlier were saying that they were using the tuner inside of their radios feeding their amp. And some claimed that the SWR would change
/archives//html/Amps/2015-01/msg00126.html (12,436 bytes)

15. Re: [Amps] {Collins} Understanding Screen Current in a Tetrode (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Tue, 27 Jan 2015 22:02:12 -0600
A little clarification is in order here: You tune the PLATE tune control for a peak in screen current the same way as you would dip the plate current. The screen current is much more sensitive than t
/archives//html/Amps/2015-01/msg00329.html (16,207 bytes)

16. Re: [Amps] GS-35b fully-submersed oil cooling (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Tue, 17 Mar 2015 19:13:38 -0500
Bird uses oil in their dummy loads for cooling. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2015-03/msg00038.html (11,126 bytes)

17. Re: [Amps] Do 8875's die fast after weakening? (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Tue, 17 Mar 2015 19:17:16 -0500
If you have a shorted tube try taking it out and taping on the top with a hammer. This sometimes loosens the gold balls and lets them drop to the bottom. Do not turn the tube over after you do this o
/archives//html/Amps/2015-03/msg00039.html (12,079 bytes)

18. Re: [Amps] more - oil bath GS-35b (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Sun, 29 Mar 2015 23:01:24 -0500
You do not need to slow the flow down in order to pick up heat. The faster the flow the more heat will be transferred. On another note, you will need as much air movement to cool the radiator as you
/archives//html/Amps/2015-03/msg00077.html (11,126 bytes)

19. Re: [Amps] more - oil bath GS-35b (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Tue, 31 Mar 2015 23:22:22 -0500
How is the radiator different from the tube? Heat transfer is about temperature difference, flow rate and turbulent flow. The greater temperature difference the faster the heat transfer. If you slow
/archives//html/Amps/2015-04/msg00004.html (9,778 bytes)

20. Re: [Amps] more - oil bath GS-35b (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Wed, 1 Apr 2015 16:02:13 -0500
Yes there is a limit for flow rate in the heat exchanger. When the inlet and outlet temperature become the same then higher flow rates will not help. However with inlet and outlet temperatures near t
/archives//html/Amps/2015-04/msg00019.html (17,767 bytes)

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