To: | <tentec@contesting.com> |
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Subject: | [TenTec] Scout,Omni,TS 850 transmit |
From: | bstephens1@mindspring.com (robert k stephens) |
Date: | Sat, 24 Aug 2002 17:43:04 -0400 |
Given 50 watts output, and careful modulation, are the Scout's 3rd order -25 and 5th order -35 sufficient for a clean signal ? p.s I was monitoring my signal on a Kenwood today and feel that the hand mic is a bit bassy but not that is just taste. I was offered a loan of of a ten tec wired D 104 and although I didn't have a chance to hear it myself and did make a contact with it. The guy I contacted listened to the hand mic and the D 104 and said the D 104 was *much better so if the bands co-operate I'll try to have some fun with the D 104 and see how it does. I understand a D 104 can easily overdrive a modern rig so I'll try to be careful about that. 73 Bob KB1CIW At 09:43 AM 8/24/02 -0500, Dr. Gerald N. Johnson, electrical engineer wrote: >Poor transmitter intermod is noticed first by users of adjacent >frequencies as monkey chatter and splatter. IN the ault days of tube >finals going for third order of -30 gave a super 5th order and the >higher order intermod products were hard to find. Solid state finals >tend to have much greater higher order intermod products that spread out >much further across the bands. Add to that broadband noise from the >amplifiers and the whole noise floor of the bands rise just due to less >than perfect transmitters. > >When listening to the distorted signal, the receiver filter helps clean >up some of the IMD products to make the signal sound better. That's why >a scope on a receiver after the filter really tells little about the >quality of the transmitted signal. > >73, Jerry, K0CQ > >-- >Entire content copyright Dr. Gerald N. Johnson, electrical engineer. >Reproduction by permission only. > |
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