- 101. Re: [Amps] Silicone hose from Flex Technologies (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Fri, 20 Jul 2012 15:33:56 -0400
- To expand on this, take a piece of conduit, wood dowel, plastic tube, or anything else of the proper diameter (usually just a little smaller than the OD of the tubes). Wrap the sheet around the tube
- /archives//html/Amps/2012-07/msg00232.html (10,605 bytes)
- 102. Re: [Amps] Forms for air wound coils (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Mon, 23 Jul 2012 17:13:35 -0400
- You didn't say how you are going to use this so I don't know what temps will be involved. There are many every day items that can be used, but some, or many do not handle elevated temperatures well.
- /archives//html/Amps/2012-07/msg00244.html (8,783 bytes)
- 103. Re: [Amps] Forms for air wound coils (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Mon, 23 Jul 2012 23:48:12 -0400
- To me an air wound coil is not left on the form, and many not even be wound on a form. I say that as I used to wind (by hand) both pancake and solenoid air core coils to handle up to 30 or 40 Kw. I d
- /archives//html/Amps/2012-07/msg00253.html (9,513 bytes)
- 104. Re: [Amps] Overdrive protection (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Thu, 26 Jul 2012 16:50:26 -0400
- Only one brand that I know of and do all of theirs do that? I never had a problem with my 756 Pro and I believe they are one of those that supposedly have the spike. My FTDX5000MP does not create a s
- /archives//html/Amps/2012-07/msg00284.html (10,535 bytes)
- 105. Re: [Amps] Overdrive protection (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Fri, 27 Jul 2012 10:28:49 -0400
- That is the problem. With the power turned down, the first dit comes through at full power on some rigs. This approach works just fine in both of my rigs. Although the 756 Pro line is notorious for t
- /archives//html/Amps/2012-07/msg00300.html (12,245 bytes)
- 106. Re: [Amps] Overdrive protection (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Fri, 27 Jul 2012 10:49:25 -0400
- That's one of those, "It all depends". Like other topics, some do and some don't. 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@contesting.com http://lists.co
- /archives//html/Amps/2012-07/msg00303.html (10,534 bytes)
- 107. Re: [Amps] Overdrive protection (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Fri, 27 Jul 2012 10:55:24 -0400
- Ceramic tubes the size of those old 4-1000As don't have a bit of trouble either. 73 Roger (K8RI) That's the one nice _______________________________________________ Amps mailing list Amps@contesting.
- /archives//html/Amps/2012-07/msg00305.html (11,069 bytes)
- 108. Re: [Amps] Overdrive protection (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Sat, 28 Jul 2012 02:34:21 -0400
- This has been discussed on Ham Amps in conjunction with Tetrode amps, as well as the Icom groups No, contrary to all of the reports I've read, I've not experience any problem. OTOH I've had no proble
- /archives//html/Amps/2012-07/msg00324.html (9,807 bytes)
- 109. Re: [Amps] Overdrive protection (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Sat, 28 Jul 2012 02:36:47 -0400
- I run both the old 756 Pro and the new Yaesu FTDX5000MP with no problems from either. The 5000MP drives a tetrode amp generally in class A, but sometimes in AB1 73 Roger (K8RI) ______________________
- /archives//html/Amps/2012-07/msg00325.html (10,520 bytes)
- 110. Re: [Amps] Overdrive protection (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Sat, 28 Jul 2012 15:36:23 -0400
- That's pretty much how I run it. Actually I tune for about 2KW into the dummy load then increase the loading to bring it back to 1500. The amp will run 2500 pep, but running it like this gets me lots
- /archives//html/Amps/2012-07/msg00341.html (9,638 bytes)
- 111. Re: [Amps] Building amps (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Sun, 29 Jul 2012 14:58:41 -0400
- I would beg to differ about ham radio being obsolete. No, the technology is mostly not leading edge although I understand many of the digital modes do come from ham radio. OTOH there is the motto, "W
- /archives//html/Amps/2012-07/msg00357.html (11,817 bytes)
- 112. Re: [Amps] Dedicated RF (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Sun, 29 Jul 2012 23:34:14 -0400
- You should be able to purchase a pair of the Freescale devices for about half the price of one 3CX800A7. That's a max of 2400 watts. I'd think it could be derated to 1500 watts. But even then, could
- /archives//html/Amps/2012-07/msg00385.html (13,431 bytes)
- 113. Re: [Amps] Dedicated RF / tube query (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Mon, 30 Jul 2012 03:09:20 -0400
- Didn't they change the suffix on the 3CX1200 to something new? I don't know if the bias is the only thing changed with the tube designation. 73 Roger (K8RI) __________________________________________
- /archives//html/Amps/2012-07/msg00399.html (12,381 bytes)
- 114. Re: [Amps] Dedicated RF (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Tue, 31 Jul 2012 00:23:33 -0400
- The communications folks aren't interested in MF and HF. They work with CM and mm wavelengths and it's where the expansion is going on as far as commercial building and where the money is to be made.
- /archives//html/Amps/2012-07/msg00432.html (9,773 bytes)
- 115. Re: [Amps] another "new" amp coming? (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Fri, 03 Aug 2012 22:35:59 -0400
- There are just so many ways you can wire a triode, let alone an 8877. You have packaging/styling, control circuitry, and protective circuitry. Yes, you can also control it with a microprocessor and a
- /archives//html/Amps/2012-08/msg00089.html (7,827 bytes)
- 116. Re: [Amps] non traditional linear (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Mon, 13 Aug 2012 03:00:58 -0400
- Old PC? My new ones are larger than my QRO amp and weight about 2/3rds as much. I can't say they'd be much quieter though. They keep the noise down by lots of aperture and low velocity. I'm sitting b
- /archives//html/Amps/2012-08/msg00185.html (10,087 bytes)
- 117. Re: [Amps] K3 spike problem (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Thu, 16 Aug 2012 16:33:10 -0400
- I too mainly use the headphones. One reason is because of a severe high frequency hearing loss and the other is a high ambient nose level in the shop and even here in the Den with the two big compute
- /archives//html/Amps/2012-08/msg00256.html (9,233 bytes)
- 118. Re: [Amps] Blue Disc Ceramic caps ?? (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Fri, 17 Aug 2012 13:55:33 -0400
- It might or might not be a problem depending on where you live. Most fastener suppliers in the US carry metric screws and bolts as well as the US screws and Bolts. They are also about 1/2 to 1/3rd th
- /archives//html/Amps/2012-08/msg00279.html (8,727 bytes)
- 119. Re: [Amps] Available Class A in Yaesu (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Sat, 18 Aug 2012 17:23:43 -0400
- Don't forget the 5000 series. I run mine class A when driving the amp which is most of the time when chasing DX. Complete dual receivers so I usually monitor 6 while chasing DX on the other bands. 73
- /archives//html/Amps/2012-08/msg00320.html (8,844 bytes)
- 120. Re: [Amps] Multiple Amplifier Switching Box (score: 1)
- Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
- Date: Thu, 23 Aug 2012 12:52:07 -0400
- Best price I found for RG-400 was places selling on e-bay although still not cheap. Seems to be good stuff. 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@cont
- /archives//html/Amps/2012-08/msg00366.html (8,292 bytes)
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