Group Once a very active ham, I have been inactive for many years. I have started dreaming about getting back into this exciting hobby. Signs are clear that the day is fast approaching. I was a home
Same here There are still made. There are numerous manufacturers still in business, with Eimac the best known, and probably the largest. One issue I see is that for very high power you are going to n
Yup, Plus the solid state designs splatter something awful without a filter on the end. Most amateur amps have a switchable filter on the output (switchable between each band). Also, if you have a hi
Mega - Ditto's... Tubes are still the way to go unless you need your amp on battery power. At ~ $50 each, the 4CX800 is hard to beat. For the money, they are a better deal than the 3-500Z, even in it
One has to consider the "Fudge Factor". That unavoidable event that happens such as a miss-tuning/wrong antenna, etc. Solid state device aren't near as forgiving as their 'Hollow State' big brothers.
Not so. The filters are for harmonic control. My 1KW MRF150 amp (2ea 4x150 amps in PP parallel with combiners beats the socks off all of the standard ham xcvrs except some that operate the outputs c
Sam, See below; ** REPLY SEPARATOR ** Every amateur amp using solid state transistors I've seen has a switchable filter in the output. Plus, from experience on running transistor amps, they did in fa
Author: "Dr. William J. Schmidt, II" <bill@wjschmidt.com>
Date: Mon, 28 Mar 2005 23:45:15 -0600
Hence the Pi-L circuit for tubes to clean them up too... There are a lot of misconceptions about solid state amps on channel. I have built a many of them... and I will never back to tubes for power l
Bill, Do you use the 48 V devices in your mobile amp application? Dick PA3DUV _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman
Author: "Dr. William J. Schmidt, II" <bill@wjschmidt.com>
Date: Tue, 29 Mar 2005 01:05:53 -0600
I personally have gravitated towards 2SC2879's, MRF120's, and MRF455's for the car... the 2SC2879's are 14 VDC devices and are super dirt cheap in quantity.... even from a high-buck place like RF Par
It's probably not long until 36V car electrics become commonplace. Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/list
One point to be considered is that on the whole, cooling is probably easier for a tube amplifier. Especially if you want the capability of running SSTV or RTTY for long periods. 73 Peter G3RZP ______
That is spot on. Sam, W5LU _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
Sam, The 2SC2879's are what I'm getting at and the MRF-454, 2SD1466, etc.. These are not what's needed for a high power amp and to me ought to be used for no more than 2 or 4 if your going to run the
BMW is reportedly going to 42Volts. This makes much sense for starting diesel engines and QRO mobiles. Rich Measures, 805.386.3734, AG6K, www.somis.org _______________________________________________
In Purgatory, all signals are so hellishly weak they can't be copied more than 50%. Rich Measures, 805.386.3734, AG6K, www.somis.org _______________________________________________ Amps mailing list
I like the 336V EV bus myself! Worked on one for Onan a decade ago that went into a HEV that Ford was making. My part was the 20kW 3 ph rectifier / boost converter regulator for the 336V bus. Would m
Be happy they no longer use 6 volt systems. a solid state amp for that would be a nightmare BMW is reportedly going to 42Volts. This makes much sense for starting diesel engines and QRO mobiles. Rich
Do a few on this forum recall when "solid state" was transistorized mobile power supply, a great leap forward from dynamotors? I'll let others explain to the younger subscribers of this forum what a
For sure, Steven - and 6 volts DC is an engineering challenge as well. As I understand it, when VW abandoned 6v in the mid-1960s, they almost went with a 24v system instead of 12v. If they had done t