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On Sun, 22 Jul 2007 15:26:47 -0700, moparhoLICK and chukkeesukkee are
lovers wrote: |On Jul 22, 5:30 pm, james wrote: | On Sun, 22 Jul 2007 05:55:32 -0700, Jay in the Mojave | | | | | | wrote: | +++james wrote: | +++ On Sat, 21 Jul 2007 08:28:58 -0700, Jay in the Mojave | +++ wrote: | +++ | +++ | ++++++Hello All: | ++++++ | ++++++Here is a neat old speech processor that we all use to use on our AM/SSB | ++++++radios in the 80's. | ++++++ | ++++++This speech processor really worked well inreasing the average speech | ++++++power the transmitter put out. It allowed us to cut thru the skip when | ++++++trying to talk to the locals. And when underhanded transmissions where | ++++++sent it was turned off, so not all would hear ya. | ++++++ | ++++++http://cgi.ebay.com/DAIWA-SPEECH-PRO...temZ1801413908... | ++++++ | ++++++Jay in the Mojave | +++ | +++ ************** | +++ | +++ The best processor that I have ever heard was the ones made by | +++ Sherwood Engineering that worked with the Drake TR4 or with the T4X. | +++ It was an RF clipper with an 8 pole crystal filter following. That | +++ made a fantastic difference. Far better than any audio clipping or | +++ compression would do. | +++ | +++ james | +++ | +++Hello James: | +++ | +++Yeah I have heard of the Sherwood, and other processors. They did work | +++great. I don't know all the poop about them but I know when my Yaesu 902 | +++was driving my amp the Gamma Matches would ack over on the Moonraker | +++beam, with the Diawa 440. The stock processor worked also, but not like | +++the Diawa 440. | +++ | +++Another reason for dumping the gamma matches | +++ | +++Jay in the Mojave | | ************* | | It is not the fault of the Gamma Match design. The design is a very | rock solid design. How various manufacturers implement the design and | the materials used is what becomes the major issue. It is still by | far one of the better matches to take an unbalanced feedline to a | balanced antenna system. The dielectric for the capacitor should be | teflon in high voltage, ie high power, situations. Often manufacturers | skimp a bit and use nylon. Nylon deteriates with time and exposure to | UV light. Cracks propogate through the capacitor and you also get | dielctric breakdown. Teflon is a better material. I not sure but I | beleive that UV stabilized Delrin may also work adequately. Also any | other plastic that is UV stabilized may work well for medium and low | power applications. | | james- Hide quoted text - | | - Show quoted text - | |Of course, you keyclowns fail to state that if one runs 4 watts CB |power the gamma match insulator could be made out of about anything |and still wouldn't fail. Guess that would be accepting the fact that |power on the CB band of a level to cause gamma arcing is not legal. |---------------------------- I would not go that far. One could construct a gamma match that with enough time and deteriation would fail at power levels of 4 to 20 W. Still for most contruction of gamma matches, they will not fail at 4 W. james |
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