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Total 9 documents matching your query.

1. Re: [Amps] Why do commercial makers parallel up small value caps in pi circuits? (score: 1)
Author: "JC N4IS" <>
Date: Wed, 4 Dec 2013 07:00:54 -0500
The issue is the dielectric on low frequency, a doorknob capacitor can stand 3 amps on 3.5MHz. but only 1 amp or less on 1.8 MHz. Because of the high loss on 1.8 MHz the capacitor get hot, than if it
/archives//html/Amps/2013-12/msg00017.html (9,268 bytes)

2. Re: [Amps] Info on HP power supply (score: 1)
Author: "JC" <>
Date: Tue, 8 Jul 2014 15:04:07 -0400
Hi Bill This site is in German but google chrome translate it nicely. It is the most complete iformation with pictute I found about the HP PS.
/archives//html/Amps/2014-07/msg00030.html (10,612 bytes)

3. Re: [Amps] Real time tests to see if an RF transformer is saturating? (score: 1)
Author: "JC" <>
Date: Mon, 15 May 2017 10:46:35 -0400
Hi guys Sometimes I was able to find a better price on toroid's here Cheers JC N4IS Chris, Buy Fair-rite toroids from (post
/archives//html/Amps/2017-05/msg00143.html (17,536 bytes)

4. Re: [Amps] 3-500Z cool down time (score: 1)
Author: "JC" <>
Date: Mon, 5 Jun 2017 14:51:10 -0400
I think my 813 worked 20years with 3500V 800W out on a single tube, ground grid amplifier. The graphite plate got orange to yellow in few seconds any time ptt was on and back to graphite color few se
/archives//html/Amps/2017-06/msg00056.html (10,599 bytes)

5. Re: [Amps] Ferrite Core for 160M PI Output ? (score: 1)
Author: "JC" <>
Date: Tue, 13 Jun 2017 12:10:33 -0400
Hi Peter PI network loss is related with the Q of the inductor, you need material #2 or #6 ( better stability with temperature), #61 #77 are good for BALUN or chokes and not good for inductors with h
/archives//html/Amps/2017-06/msg00198.html (11,516 bytes)

6. Re: [Amps] Plate Loading Padding Caps (score: 1)
Author: <>
Date: Sat, 22 Dec 2018 14:15:31 -0500
Mark You can use CERA-MITE NPO, the max I was able to find was 170 PF, Its available at DIGIKEY, or parallel 62pf CERA-MITE - 564CC0GAA302EL620J - Capacitor, ceramic. 62pF 3,000V. $US 1.00 https://ww
/archives//html/Amps/2018-12/msg00102.html (8,862 bytes)

7. Re: [Amps] Plate Loading Padding Caps (score: 1)
Author: <>
Date: Tue, 25 Dec 2018 10:23:07 -0500
Rob You are right the current at 1.8 MHz is the issue. Check the current rate for doorknob capacitor, like HT50 page 11, blue line.
/archives//html/Amps/2018-12/msg00107.html (8,873 bytes)

8. Re: [Amps] What to do about 'Neutral' in HB amp? (score: 1)
Author: <>
Date: Wed, 28 Dec 2022 17:10:42 -0500
That is a catch 22. The NEC for residence is not the same for a Radio Station, and R56 - Standards and Guidelines for Communication Sites. However we have a residence and a Radio Station on the same
/archives//html/Amps/2022-12/msg00133.html (10,882 bytes)

9. Re: [Amps] What to do about 'Neutral' in HB amp? (score: 1)
Author: <>
Date: Wed, 28 Dec 2022 18:29:53 -0500
Whats a catch 22? You need to connect the Amp chassis to the AC neutral (wire connected to the ground at the AC entrance), and you need to connect the Amp chassis to the ground of the station, at sam
/archives//html/Amps/2022-12/msg00137.html (10,050 bytes)

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