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1. [Amps] CB Amps or full spectrum??? (score: 1): Author: <chasm@texas.net>; Date: Tue, 09 Oct 2007 01:24:39 -0500; Hoping that you all believe that the only stupid question is the one not asked... I got a bunch of really good ones..... I am looking for a solid state mobile/portable/base amp that will perk along a; /archives//html/Amps/2007-10/msg00083.html (8,432 bytes)
2. Re: [Amps] CB Amps or full spectrum??? (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Tue, 9 Oct 2007 09:10:59 -0400; Im sure others will chime in but some of those CB amps are very useful on ham bands. BUT, they usually all need the following: Rebiasing for true linear service. Since the circuits are mostly copied; /archives//html/Amps/2007-10/msg00084.html (10,982 bytes)
3. Re: [Amps] CB Amps or full spectrum??? (score: 1): Author: "EP Swynar" <gswynar@durham.net>; Date: Tue, 9 Oct 2007 09:24:45 -0400; Hi Guys, The old CB-type linear amplifiers can be VERY useful peripherals for the mobile operator -- especially on 10-meters, where very little is needed in the L/C networks incorporated within, beyo; /archives//html/Amps/2007-10/msg00085.html (13,128 bytes)
4. Re: [Amps] CB Amps or full spectrum??? (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Tue, 09 Oct 2007 07:47:25 -0700; These are all CB amps. There are at least two problems which make them unusable on the ham bands. One is that they often do not have biasing circuits that are really appropriate for voice transmissio; /archives//html/Amps/2007-10/msg00086.html (7,810 bytes)
5. Re: [Amps] CB Amps or full spectrum??? (score: 1): Author: "EP Swynar" <gswynar@durham.net>; Date: Tue, 9 Oct 2007 11:36:00 -0400; Hi Vic et al, All the more reason to buy a tube-type CB linear amplifier for Ham service... The ones that I've seen come with conventional pi-network output circuitry which includes a variable plate; /archives//html/Amps/2007-10/msg00087.html (9,869 bytes)
6. Re: [Amps] CB Amps or full spectrum??? (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Tue, 9 Oct 2007 11:42:02 -0400; There are at least four major problems with the amps, not two. 1.) Filtering. They need filters to reduce harmonics. 2.) Power output. These amps are all really ratty at rated power, and it has noth; /archives//html/Amps/2007-10/msg00088.html (10,601 bytes)
7. Re: [Amps] CB Amps or full spectrum??? (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Tue, 9 Oct 2007 13:25:23 -0400; Running low voltage bipolar transistors on a big antenna or at high power is really not a good idea and the cure isn't as simple as setting the zero signal idle current or adding a harmonic filter. T; /archives//html/Amps/2007-10/msg00089.html (8,459 bytes)
8. Re: [Amps] CB Amps or full spectrum??? (score: 1): Author: "RAY FRIESS" <rayfrijr@msn.com>; Date: Wed, 10 Oct 2007 09:48:02 -0600; I wondering about your comment about filtering. If you look at the tank circuit of these amps, you see a pi network that is usually no different than any other amp, except the coil is small turns wis; /archives//html/Amps/2007-10/msg00094.html (11,102 bytes)
9. Re: [Amps] CB Amps or full spectrum??? (score: 1): Author: "Peter Voelpel" <df3kv@t-online.de>; Date: Wed, 10 Oct 2007 17:57:50 +0200; It´s no tube amp, but a 12V transistor amp where band passes are necessary 73 Peter I wondering about your comment about filtering. If you look at the tank circuit of these amps, you see a pi n; /archives//html/Amps/2007-10/msg00095.html (12,039 bytes)
10. Re: [Amps] CB Amps or full spectrum??? (score: 1): Author: Steve Katz <stevek@jmr.com>; Date: Wed, 10 Oct 2007 08:56:29 -0700; circuit of these amps, you see a pi network that is usually no different than any other amp, except the coil is small turns wise because it is for 11 meters (and close to 10 meters as well). So what; /archives//html/Amps/2007-10/msg00096.html (8,824 bytes)
11. Re: [Amps] CB Amps or full spectrum??? (score: 1): Author: "RAY FRIESS" <rayfrijr@msn.com>; Date: Wed, 10 Oct 2007 10:12:19 -0600; So then the ones with tubes would not have the harmonic problems? It´s no tube amp, but a 12V transistor amp where band passes are necessary 73 Peter --Original Message-- From: amps-bounces@con; /archives//html/Amps/2007-10/msg00097.html (13,808 bytes)
12. Re: [Amps] CB Amps or full spectrum??? (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Wed, 10 Oct 2007 12:41:08 -0400; Thats a loaded question since even some poorly designed ham amps and transmitters dont meet FCC regulations. The only proper way to tell the harmonic content is to use a spectrum analyzer. In additio; /archives//html/Amps/2007-10/msg00098.html (14,603 bytes)
13. Re: [Amps] CB Amps or full spectrum??? (score: 1): Author: rgroh@swbell.net; Date: Wed, 10 Oct 2007 09:46:12 -0700 (PDT); The tube one's would probably (i.e. 'might') have fewer harmonics. Part of that is because a tube amplifier is inherently a fairly highish Q due to matching from hiZ to 50 ohms. Transistor amplifiers; /archives//html/Amps/2007-10/msg00099.html (13,271 bytes)
14. Re: [Amps] CB Amps or full spectrum??? (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Wed, 10 Oct 2007 18:55:48 +0200 (CEST); If the pi network is not different than, say, a 30L-1 or an SB 200 or any other amp with a pi network, why would harmonics be any more of a problem than with other amps?< Firstly, if you do the sums; /archives//html/Amps/2007-10/msg00100.html (10,107 bytes)
15. Re: [Amps] CB Amps or full spectrum??? (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Wed, 10 Oct 2007 13:46:00 -0400; More than one legitimate ham brick manufacturer produced a CB amp under a different "corporate" name. I assume they used similar engineering "expertise" with the bias circuits. BTW, a 1N5408 on top o; /archives//html/Amps/2007-10/msg00103.html (11,816 bytes)
16. Re: [Amps] CB Amps or full spectrum??? (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Wed, 10 Oct 2007 14:03:36 -0400; Measure the voltage regulation of that method when you drive the amp with rated drive power and most people's opinion will change. It's a crummy system at more than a few watts. As the base is drive; /archives//html/Amps/2007-10/msg00104.html (8,359 bytes)
17. Re: [Amps] CB Amps or full spectrum??? (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Wed, 10 Oct 2007 14:11:25 -0400; You keep saying that Peter, but it isn't true. A simple pi network can easily make a class AB2 amp -55dB or more for harmonics. For example the AL-12 series of amps makes about -60dBc on bands where; /archives//html/Amps/2007-10/msg00105.html (9,361 bytes)
18. Re: [Amps] CB Amps or full spectrum??? (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Wed, 10 Oct 2007 14:28:53 -0400; I find it strange that you condemn a circuit without even knowing its details. Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.; /archives//html/Amps/2007-10/msg00106.html (8,876 bytes)
19. Re: [Amps] CB Amps or full spectrum??? (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Wed, 10 Oct 2007 16:30:56 -0400; Not nearly as strange as I find when someone endorses a circuit without knowing how it works. 73 Tom _______________________________________________ Amps mailing list Amps@contesting.com http://list; /archives//html/Amps/2007-10/msg00108.html (8,190 bytes)
20. [Amps] CB Amps or full spectrum??? (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Wed, 10 Oct 2007 22:51:47 +0200 (CEST); regulator. Not perfect but its cheap and simple as a retrofit of an existing brick.< If the diode is used just as a shunt regulator, that's a not very good bodge. If it's used as asensor in a regula; /archives//html/Amps/2007-10/msg00110.html (8,054 bytes)

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