Maybe the list moderator would like to weigh in on this? I have only this short comment to make, and I will not be entertaining responses via the list.
As I wade through the daily mail, I see that there are a lot of clich� responses on the list that contribute to the high daily volume of mail and bandwidth. While I will agree that everyone has a right to their opinion, and to utter their clich� comments, I do believe there are a lot of folks who get tired of wading through the BS. Therefore, for my convenience at least, please always endeavor to post your response at the head (the top) of the message above the quoted text. That way it can more easily and efficiently be found and read for quicker disposition. Also, while anyone would have to be insane (virtually at least) to forward a list such as this to a wireless device, long messages to such devices and other accounts are usually truncated, and in such a case your reply input would likely not be displayed, but be in the bit bucket by default. No, I'm not complaining, just offering food for thought. Steve AA5SG ----- Original Message ----- From: "Ralph Mowery" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Saturday, December 06, 2003 8:15 AM Subject: Re: [Repeater-Builder] UHF Repeater Preamp > > > > That's a hard question to answer. Some preselectors are based upon the > > physical package used for mobile duplexers, and may work just fine- but > > they are not flexible. I prefer to use an 8 inch bandpass cavity that I > > can tune for almost any selectivity and insertion loss that I want. If > > you have a good preamp with, say, 10 dB of gain, you can set up a > > bandpass cavity to be extremely narrow but with 5 dB insertion loss, and > > you will still be far better off (+5 dB) than without the preamp and you > > will have reduced the vulnerability to overload and desense. At UHF, > > with a 5 MHz split, the playing field is a lot different from that at > > 2m, with a 600 kHz split. > > > > 73, Eric Lemmon WB6FLY > > > > This just does not seem to be a good way to go. If you put a 5 db loss > before the preamp the noise figure can not be made up nomater how much gain > the preamp has. To top it all off you have to add about 2 db to that for > the losses in the duplexer. You let the bp/br duplexer take care of the in > band problems and then use a band pass cavity that does not have to have > very much loss to take care of the out of band problems if needed. > > de KU4PT > > > > > > > > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ > > > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
