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Total 27 documents matching your query.

1. [AMPS] Re: Ferrite Rod for 6M Amp (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 1 Jun 1999 09:05:06 -0400; Hi Mike, Actually the only part that doesn't make sense is why a ferrite material used in hundreds or thousands of harmonic distortion critical VHF applications apparently failed Rich's test and cert; /archives//html/Amps/1999-06/msg00004.html (10,301 bytes)
2. [AMPS] Re: Ferrite Rod for 6M Amp (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 1 Jun 1999 14:26:49 +0100; I've lost the thread here - mixers do intermodulate - they're usually the determining factor in the IMD performance of a well designed receiver. Tom, what are you trying to say? 73 Peter G3RZP -- FAQ; /archives//html/Amps/1999-06/msg00005.html (8,539 bytes)
3. [AMPS] Re: Ferrite Rod for 6M Amp (score: 1): Author: jono@enteract.com (Jon Ogden); Date: Tue, 1 Jun 99 09:23:13 -0500; Mixers do generate intermod products. However, we have to define what is an "acceptable" level of intermodulation distortion. A mixer driven at proper levels with a proper LO applied will produce ne; /archives//html/Amps/1999-06/msg00006.html (9,734 bytes)
4. [AMPS] Re: Ferrite Rod for 6M Amp (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 1 Jun 1999 14:24:15 -0400; That's right. It's an imperfect world. The mixers in my FT-1000, however, are cleaner than the class A push-pull FET's used in the preamplifier to drive the mixers. The mixers in your SSB transmitte; /archives//html/Amps/1999-06/msg00011.html (11,621 bytes)
5. [AMPS] Re: Ferrite Rod for 6M Amp (score: 1): Author: jono@enteract.com (Jon Ogden); Date: Tue, 1 Jun 99 17:02:11 -0500; Absolutely. I agree 100%. THe FET's will be over-driven before the mixer is. That's why you can turn the preamp-off and get a tremendous improvement in IP3 performance. Agreed. True again as well. S; /archives//html/Amps/1999-06/msg00013.html (10,454 bytes)
6. [AMPS] Re: Ferrite Rod for 6M Amp (score: 1): Author: W4EF@pacbell.net (Michael Tope); Date: Tue, 1 Jun 1999 20:40:01 -0700; Hi Tom, Thanks for your comments. After considerable rumination, I think I have reconciled your arguments and mine along with some previosuly fuzzy thinking on my part. Mixers are always non-linear d; /archives//html/Amps/1999-06/msg00021.html (14,095 bytes)
7. [AMPS] Re: Ferrite Rod for 6M Amp (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 2 Jun 1999 09:14:57 +0100; tremendous In any properly designed receiver, the IMD performance of the RF amp will be a relatively small contribution. The mixer, and occasionally, high frequency crystal filters are the major caus; /archives//html/Amps/1999-06/msg00028.html (9,609 bytes)
8. [AMPS] Re: Ferrite Rod for 6M Amp (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 2 Jun 1999 09:33:35 +0100; -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com Search: http://www.cont; /archives//html/Amps/1999-06/msg00030.html (8,913 bytes)
9. [AMPS] Re: Ferrite Rod for 6M Amp (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 2 Jun 1999 08:18:56 -0400; Hi Mike, Everyone with ability to reason through problems should see eye to eye on this, because things work the way they work. This is like beating a dead horse at this point, however, because every; /archives//html/Amps/1999-06/msg00035.html (16,887 bytes)
10. [AMPS] Re: Ferrite Rod for 6M Amp (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 2 Jun 1999 08:18:56 -0400; Hi Peter, I'm not talking about perfectly designed receivers, I was conveying how my FT-1000 actually measures. The worse thing in my FT1000 was the MOSFET in the noise blanker left hanging on the IF; /archives//html/Amps/1999-06/msg00037.html (11,002 bytes)
11. [AMPS] Re: Ferrite Rod for 6M Amp (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 2 Jun 1999 13:37:52 +0100; That's damning with faint praise, Tom!! I've never yet found out why noise blankers always seem to screw up the essentail parameters of a reciever, such as IMD. Also, designers seem to have funny ide; /archives//html/Amps/1999-06/msg00039.html (9,110 bytes)
12. [AMPS] Re: Ferrite Rod for 6M Amp (score: 1): Author: jono@enteract.com (Jon Ogden); Date: Wed, 2 Jun 99 08:53:51 -0500; I stand corrected. And now that I think about it, I don't know why I rushed to agree with Tom. If the IM distortion was caused just be the preamps in rigs like the FT-1000D and mixers are hard to ov; /archives//html/Amps/1999-06/msg00042.html (9,182 bytes)
13. [AMPS] Re: Ferrite Rod for 6M Amp (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 2 Jun 1999 15:44:05 -0400; Hi Jon, Doesn't matter if you agree or not, or why anyone guesses they did what they did on any rig. A guess is just a guess. The fact of the matter, however, is I actually measured the internal perf; /archives//html/Amps/1999-06/msg00060.html (12,183 bytes)
14. [AMPS] Re: Ferrite Rod for 6M Amp (score: 1): Author: royanjoy@ncn.net (Roy Koeppe); Date: Wed, 26 May 1999 14:23:20 -0500; Harry, Amidon lists material 61 rods for such use up to 200mHz. 73, Roy K6XK -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUES; /archives//html/Amps/1999-05/msg00308.html (7,779 bytes)
15. [AMPS] Re: Ferrite Rod for 6M Amp (score: 1): Author: measures@vc.net (Rich Measures); Date: Wed, 26 May 1999 13:24:40 -0700; ? the manufacturer. of 61 material rates it at 10MHz. At 14MHz, I can see waveform distortion on an oscilloscope. - later, Roy Rich... R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures -- F; /archives//html/Amps/1999-05/msg00312.html (8,144 bytes)
16. [AMPS] Re: Ferrite Rod for 6M Amp (score: 1): Author: royanjoy@ncn.net (Roy Koeppe); Date: Wed, 26 May 1999 16:34:56 -0500; All, "Harry, ? the manufacturer. of 61 material rates it at 10MHz. At 14MHz, I can see waveform distortion on an oscilloscope. - later, Roy Rich..." Quoting from Amidon flyer: "Material 61 (u=125) ..; /archives//html/Amps/1999-05/msg00314.html (8,657 bytes)
17. [AMPS] Re: Ferrite Rod for 6M Amp (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 26 May 1999 17:55:20 -0400; Rich "sees" many things no one else ever "sees" with their test equipment. Quoting from Fair-rite Corp, an actual manufacturer of soft iron materials, 61 material is suitable in broadband transforme; /archives//html/Amps/1999-05/msg00316.html (9,887 bytes)
18. [AMPS] Re: Ferrite Rod for 6M Amp (score: 1): Author: measures@vc.net (Rich Measures); Date: Thu, 27 May 1999 02:16:33 -0700; ? In the test I performed with type-61 material operating at 14MHz, the slope of the waveform was noticably different from that of a sinewave -- esp. between 60-degrees to 80-degrees and 100-degrees; /archives//html/Amps/1999-05/msg00320.html (10,646 bytes)
19. [AMPS] Re: Ferrite Rod for 6M Amp (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 27 May 1999 10:00:11 -0400; Hi Rich and all, While I agree an air core alone is sufficient to make a reasonable filament choke on 50 MHz, Rich has a total misunderstanding of what creates "distortion" that we can hear in a line; /archives//html/Amps/1999-05/msg00322.html (11,462 bytes)
20. [AMPS] Re: Ferrite Rod for 6M Amp (score: 1): Author: measures@vc.net (Rich Measures); Date: Thu, 27 May 1999 13:35:20 -0700; hello, Tom It was not a SSB signal. It was an AØ signal of 100w. The type-61 material performed well at 10MHz. The waveform looked good. I slowly increased freq. At 14MHz, the waveform did not; /archives//html/Amps/1999-05/msg00325.html (13,530 bytes)

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