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1. [Amps] Amplifier for 630 meter band (score: 1): Author: Catherine James <catherine.james@att.net>; Date: Thu, 9 Nov 2017 18:01:17 +0000 (UTC); I'm starting to think about building a transmitting station for 630 meters next spring. I've filed my UTC request and expect it to be approved. I think it will be much easier to start with an existin; /archives//html/Amps/2017-11/msg00089.html (7,641 bytes)
2. Re: [Amps] Amplifier for 630 meter band (score: 1): Author: Steve Wright <stevewrightnz@gmail.com>; Date: Fri, 10 Nov 2017 07:58:03 +1300; If you get someone to guillotine off the aluminum panels for you, it's easy to just pop-rivet them to some angle section - tada! One nice box! No bending or cutting. All you need is an electric dril; /archives//html/Amps/2017-11/msg00092.html (8,162 bytes)
3. Re: [Amps] Amplifier for 630 meter band (score: 1): Author: Tom Osborne <w7why1@gmail.com>; Date: Thu, 9 Nov 2017 11:04:24 -0800; If you can find some perforated aluminum panels, that really makes a neat looking enclosure. Just build it like Steve said. 73 Tom W7WHY _______________________________________________ Amps mailing l; /archives//html/Amps/2017-11/msg00093.html (7,903 bytes)
4. [Amps] Amplifier for 630 meter band (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Fri, 10 Nov 2017 09:12:15 -0800; <I'm starting to think about building a transmitting station for 630 meters next spring. I've filed my UTC request and expect it to be approved. I think it will be much easier to start with an existi; /archives//html/Amps/2017-11/msg00096.html (10,004 bytes)
5. Re: [Amps] Amplifier for 630 meter band (score: 1): Author: Catherine James <catherine.james@att.net>; Date: Fri, 10 Nov 2017 17:35:54 +0000 (UTC); "U may well have a tough time stuffing parts into a SB-200 chassis. This is where a simple, bigger box would help out. Something like a single 3-400Z / 3-500Z would do the trick, dead simple. Then u; /archives//html/Amps/2017-11/msg00097.html (8,289 bytes)
6. Re: [Amps] Amplifier for 630 meter band (score: 1): Author: Merv Schweigert via Amps <amps@contesting.com>; Date: Fri, 10 Nov 2017 08:01:03 -1000; Lot of work for naught.. the power limit on 630M is 5 watts and even with a very poor antenna you only need 100 to 200 watts to get 5 out of the antenna. A single or two MOSFET amplifier will do that; /archives//html/Amps/2017-11/msg00098.html (10,769 bytes)
7. Re: [Amps] Amplifier for 630 meter band (score: 1): Author: "Randall, Randy" <Randy.Randall@UCHealth.com>; Date: Fri, 10 Nov 2017 18:14:06 +0000; See if you can find an RF generator from a MRI machine. The basics are there and you can as suggested in this thread outboard the input network and the output network in an external enclosure. I have; /archives//html/Amps/2017-11/msg00099.html (11,138 bytes)
8. Re: [Amps] Amplifier for 630 meter band (score: 1): Author: Richard Solomon <dickw1ksz@gmail.com>; Date: Fri, 10 Nov 2017 11:16:34 -0700; Just a thought ... has anyone done any calculations on the values for a Pi-Network ? I expect you will be surprised. 73, Dick, W1KSZ On Fri, Nov 10, 2017 at 11:14 AM, Randall, Randy <Randy.Randall@uc; /archives//html/Amps/2017-11/msg00100.html (11,998 bytes)
9. Re: [Amps] Amplifier for 630 meter band (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Fri, 10 Nov 2017 10:25:46 -0800; I've seen observations that some audio power amplifier can be made to work by removing any circuitry to limit their bandwidth. Audio amplifiers generally have high linearity within the audio spectrum; /archives//html/Amps/2017-11/msg00101.html (9,114 bytes)
10. Re: [Amps] Amplifier for 630 meter band (score: 1): Author: Merv Schweigert via Amps <amps@contesting.com>; Date: Fri, 10 Nov 2017 08:34:05 -1000; Audio amps that I have seen so far (Haffler) are used on the 136KHZ band, have not seen but perhaps one or two used on 630M. The Haffler amps work very well on 136khz, mods are available on the web f; /archives//html/Amps/2017-11/msg00102.html (9,600 bytes)
11. Re: [Amps] Amplifier for 630 meter band (score: 1): Author: Steve Wright <stevewrightnz@gmail.com>; Date: Sat, 11 Nov 2017 08:49:55 +1300; I built one. It's enormous. It's not going to fit in any existing linear amp cabinet. There are a number of amp designs on the Internet. I decided I wanted to revisit the period not just with the; /archives//html/Amps/2017-11/msg00104.html (9,037 bytes)
12. [Amps] Amplifier for 630 meter band (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Fri, 10 Nov 2017 12:42:34 -0800; Date: Fri, 10 Nov 2017 11:16:34 -0700 From: Richard Solomon <dickw1ksz@gmail.com> To: Amplifiers <Amps@contesting.com> Subject: Re: [Amps] Amplifier for 630 meter band Message-ID: <CAC5FBO9twZ-tOCKh2; /archives//html/Amps/2017-11/msg00105.html (8,990 bytes)
13. [Amps] Amplifier for 630 meter band (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Fri, 10 Nov 2017 12:50:26 -0800; <Lot of work for naught.. the power limit on 630M is 5 watts and even with a very poor antenna you only need 100 to 200 watts to get 5 out of the antenna. A single or two MOSFET amplifier will do tha; /archives//html/Amps/2017-11/msg00106.html (9,220 bytes)
14. Re: [Amps] Amplifier for 630 meter band (score: 1): Author: Merv Schweigert via Amps <amps@contesting.com>; Date: Fri, 10 Nov 2017 11:13:53 -1000; E or similar ? Yes both class D and E are used to achieve high efficiency. You cant work em, if they cant hear you. Jim VE7RF Not true at all, first off FCC rules are 5 Watt, if you wish to break em; /archives//html/Amps/2017-11/msg00107.html (10,635 bytes)
15. Re: [Amps] Amplifier for 630 meter band (score: 1): Author: Chris Wilson <chris@chriswilson.tv>; Date: Fri, 10 Nov 2017 21:31:36 +0000; Hello Catherine, I run several W1VD design Class D MOSFET amps on LF (136kHz) and they perform really well. Most expensive item to source here in the UK is the LPF toroids, mainly di=ue to carriage f; /archives//html/Amps/2017-11/msg00108.html (11,267 bytes)
16. Re: [Amps] Amplifier for 630 meter band (score: 1): Author: "Kevin Stover, AC0H" <kstover@ac0h.net>; Date: Fri, 10 Nov 2017 17:04:31 -0600; Convert a 100W Marshall head to 630m? ;-) I've seen observations that some audio power amplifier can be made to work by removing any circuitry to limit their bandwidth. Audio amplifiers generally hav; /archives//html/Amps/2017-11/msg00109.html (10,011 bytes)
17. Re: [Amps] Amplifier for 630 meter band (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Fri, 10 Nov 2017 17:57:03 -0800; I was thinking of one of the more linear pro audio products. Like Crown, UREI, QSC. I suspect that musical instrument amps may have more distortion that will require more filtering. But ya never kn; /archives//html/Amps/2017-11/msg00110.html (9,748 bytes)
18. Re: [Amps] Amplifier for 630 meter band (score: 1): Author: Ron Youvan <ka4inm@gmail.com>; Date: Fri, 10 Nov 2017 21:48:47 -0500; I was thinking of one of the more linear pro audio products. Like Crown, UREI, QSC. I suspect that musical instrument amps may have more distortion that will require more filtering. But ya never kn; /archives//html/Amps/2017-11/msg00111.html (9,941 bytes)
19. Re: [Amps] Amplifier for 630 meter band (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Fri, 10 Nov 2017 19:54:10 -0800; What fight? I thought we were throwing ideas around. 73, Jim K9YC _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/a; /archives//html/Amps/2017-11/msg00112.html (9,930 bytes)
20. Re: [Amps] Amplifier for 630 meter band (score: 1): Author: Steve Wright <stevewrightnz@gmail.com>; Date: Sat, 11 Nov 2017 16:55:41 +1300; What fight? I thought we were throwing ideas around. We're misusing the blazes out of the english language! It's a very common ham radio activity! ;) S ____________________________________________; /archives//html/Amps/2017-11/msg00113.html (10,087 bytes)

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