I knew there was a reason - and that makes perfect since. I have seen the "cans" you talk about and they can get large.
Thanks for the info makes all the difference in the world LeRoy, KD8BXP http://www.HamOhio.com Sent on the Now Network� from my Sprint® BlackBerry -----Original Message----- From: "Greg D." <[email protected]> Date: Sun, 5 Jul 2009 12:14:44 To: <[email protected]>; <[email protected]> Subject: RE: [amsat-bb] I just curious I think actually that there was an early OSCAR that did run a same-band transponder, but it's not easy. The problem is getting enough separation filtering between the receive and transmit so that the satellite doesn't hear itself. Terrestrial repeaters use large mechanical filters ("cans") to do this, but these are impractical on a spacecraft that may be many times smaller than the filter itself. Going cross-band makes that filtering much easier. Greg KO6TH > To: [email protected] > From: [email protected] > Date: Sun, 5 Jul 2009 19:06:54 +0000 > Subject: [amsat-bb] I just curious > > This is probably one of those questions that has a very simple answer maybe > something I wasn't thinking of. > > On the FM birds how come the split is V/U or U/V? Are there any V/V birds? > > I mean if doppler doesn't effect the vhf as much wouldn't it make since to > have some V/V? Wouldn't have to worry about doppler anyways > > I know there is a reason, so I am curious that is all! > > LeRoy, KD8BXP > http://www.HamOhio.com > > Sent on the Now Network� from my Sprint® BlackBerry > _________________________________________________________________ Hotmail® has ever-growing storage! Don’t worry about storage limits. http://windowslive.com/Tutorial/Hotmail/Storage?ocid=TXT_TAGLM_WL_HM_Tutorial_Storage_062009
_______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
