This brings up the question of how one actually does testing of a D-Star system. So far it seems that trail and error is the only way things actually get measured. Having read that the D-Star boxes Icom sells are little more than mobiles in a box I am wondering if it is possible to set the internals to an analog state to do desense testing?
Milt N3LTQ ----- Original Message ----- From: "atms169" <[email protected]> To: <[email protected]> Sent: Wednesday, May 20, 2009 11:28 PM Subject: [Repeater-Builder] Re: Desense on High Power Linear Repeater? >I have opened both repeaters. The VHF already had the blue hardline in it, >the UHF however I replaced with superflex. > > I may try something different. Hardline up the tower and for a patch cord > (about 10 feet) up the mast I'll use superflex. I'll have to play around > and see what I have still. > > The preamp has made a big impression on the RX without the amp. I have > not tried the system without it and the amp at the same time. Might be > worth a shot. > > I don't have any test equipment that would work for the digital dstar so > it's more of a trial and error thing. > > > --- In [email protected], "wa1nh" <wa...@...> wrote: >> >> I am going to ask a question that might sound stupid but, based upon >> Icom's ignorance, I need to ask. >> Did you ever open the repeater case on the 2m repeater and replace the >> rg-58 patch cables that are zip tied to each other to connect the rf >> modules to the rear of the case before adding your preamp? Our local >> repeater guys had serious desense and ended up replacing the junk cables >> with rg393.........And you may find that the receiver sensitivity is >> closer to 0.6 uV. >> IF you insist on using the preamp, I would suggest using a decade box to >> attenuate after the preamp.....changing the attenuation periodically to >> get it to a better level. +18dB is a little too much for any receiver. >> >> Jason, WA1NH > > > > > ------------------------------------ > > > > Yahoo! Groups Links > > >
