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1. [Amps] 4CX1000A for SSB?? (score: 1): Author: "ad5gb" <ad5gb@myway.com>; Date: Fri, 18 Mar 2005 15:33:36 -0500 (EST); I just found a chart that listed the distortion characteristics of varioius tubes. I was really disappointed to see how poorly the 4CX1000A ranked amongst the competitors. IIRC, I think it was the ab; /archives//html/Amps/2005-03/msg00398.html (7,571 bytes)
2. Re: [Amps] 4CX1000A for SSB?? (score: 1): Author: David Kirkby <david.kirkby@onetel.net>; Date: Sat, 19 Mar 2005 00:28:14 +0000; How about trying to use RF negative feedback, where some of the output is coupled back to the input in anti-phase? Negative feedback will generally improve the linearity. I've not tried it myself, bu; /archives//html/Amps/2005-03/msg00400.html (9,852 bytes)
3. Re: [Amps] 4CX1000A for SSB?? (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Sat, 19 Mar 2005 08:02:22 -0000; I recall a 144MHz design in VHF Communications which showed excellent IMD from (I think) a 4CX1000A running at 750-1000W output. It's a couple of days until I can get near my stuff to look for it -; /archives//html/Amps/2005-03/msg00405.html (7,688 bytes)
4. Re: [Amps] 4CX1000A for SSB?? (score: 1): Author: "Mark Marsden" <MM@plextek.co.uk>; Date: Wed, 23 Mar 2005 10:01:23 +0000; Hi Randall Have a look at http://granta.digital-crocus.com/Linear_Design_notes/Spectral_regrowth.jpg That's a screenshot of the transmit spectrum of my 4CX1000A linear, (Va 2750V, Vs 350V, ZSAC 250mA; /archives//html/Amps/2005-03/msg00515.html (9,668 bytes)
5. Re: [Amps] 4CX1000A for SSB?? (score: 1): Author: Gary Schafer <garyschafer@comcast.net>; Date: Wed, 23 Mar 2005 13:47:02 -0500; But what does it tell you? 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2005-03/msg00533.html (11,035 bytes)
6. Re: [Amps] 4CX1000A for SSB?? (score: 1): Author: "ad5gb" <ad5gb@myway.com>; Date: Wed, 23 Mar 2005 14:20:02 -0500 (EST); Hi all, This may be a great opportunity to learn something.... having never used a spectrum analyzer before and having only hobbyist knowlege of electronics (hence the reason I sometimes ask really d; /archives//html/Amps/2005-03/msg00534.html (12,302 bytes)
7. Re: [Amps] 4CX1000A for SSB?? (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Thu, 24 Mar 2005 12:29:48 -0500; Ok, I just took a look at this and see where the problem is. With a resolution bandwidth of 3kHz the 3 order IMD products are masked by the real signal. For example if you should have a 14.2815 MHz s; /archives//html/Amps/2005-03/msg00544.html (10,410 bytes)
8. Re: [Amps] 4CX1000A for SSB?? (score: 1): Author: Jan Erik Holm <sm2ekm@telia.com>; Date: Thu, 24 Mar 2005 20:20:33 +0100; I sample 10 sec´s and use 200 Hz BW. It is really interesting to see how bad some radios are that way. Some 100W radios using 12-16V final transistors really shouldn´t be run at more then; /archives//html/Amps/2005-03/msg00546.html (8,710 bytes)
9. Re: [Amps] 4CX1000A for SSB?? (score: 1): Author: "Mark Marsden" <mm@plextek.co.uk>; Date: Tue, 3 May 2005 10:05:39 +0100; Hi Bill & Amps reflectees I've remeasured the intermodulation characteristics of my 4CX1000A amplifier, more thoroughly, using two transmitters and a Wilkinson combiner. These results, and also measu; /archives//html/Amps/2005-05/msg00015.html (8,629 bytes)
10. Re: [Amps] 4CX1000A for SSB?? (score: 1): Author: G3rzp@aol.com; Date: Tue, 3 May 2005 05:15:45 EDT; I've remeasured the intermodulation characteristics of my 4CX1000A amplifier Do you use any negative feedback? It looks pretty good to me, but it would be interesting to drop in a 4CX1500B, which is; /archives//html/Amps/2005-05/msg00016.html (7,391 bytes)
11. Re: [Amps] 4CX1000A for SSB?? (score: 1): Author: "Mark Marsden" <mm@plextek.co.uk>; Date: Tue, 3 May 2005 10:23:20 +0100; Hi Peter No it doesn't use any feedback. The schematics are in pdf form on the website, just a tad out of date now that I've changed the pi tank. 73 Mark G4AXX ________________________________ I've r; /archives//html/Amps/2005-05/msg00017.html (7,714 bytes)
12. Re: [Amps] 4CX1000A for SSB?? (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Tue, 3 May 2005 10:33:52 +0100; The results stack up fairly well with the 144MHz figures form DJ4GC (VHF Communications, 4/85). In Carsten's amp the 5th and 7th order drop off a bit faster. Steve ___________________________________; /archives//html/Amps/2005-05/msg00018.html (7,354 bytes)
13. Re: [Amps] 4CX1000A for SSB?? (score: 1): Author: G3rzp@aol.com; Date: Tue, 3 May 2005 09:16:36 EDT; One should also bear in mind that the 'professional' point to point ISB links (such few as are left now!) are typically rated at -36dB on PEP for a 2 tone test, so the results look pretty good to me.; /archives//html/Amps/2005-05/msg00021.html (7,098 bytes)
14. Re: [Amps] 4CX1000A for SSB?? (score: 1): Author: Gary Schafer <garyschafer@comcast.net>; Date: Tue, 03 May 2005 11:35:49 -0400; Hi Mark, That looks more useful and seems in the ball park! I wonder if you made any measurements at 1500 watts pep output? Using long sample times with speech you still need narrower bandwidths than; /archives//html/Amps/2005-05/msg00024.html (10,782 bytes)

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