Hi You have a problem that so many repeaters have that it is frustrating beyond belief. Here is the way I am overcoming this problem after my linked system has been up for many years and driving from one to the other is just not practical. My system is a central hub repeater on uhf 1,6Mhz split and all my uhf repeaters are 7,6Mhz. This makes all audio being passed by one site to the other going into one hub and no serial daisy chaining.
All my repeaters at the moment run with either pre=emphasis or de-emphasis at their respective stages. My new repeaters I have used all 600 OHM balanced audio inputs and outputs . The confrerence amp is a modified STC PCM channel card thrown out by telco company .This card when modified becomes a 3-channel input 3 output card which is fine for my single repeater and kink with the third being used for Engineering beeps and bops or audio testing. With the aid of 600 ohm balanced attenuator pads each input to \ from a radio is set up for a level of -10 dBM for 1000 hz at for 60% max dev. The conference amp has a system gain of 10 so all inputs can be increased or decreased by using precision padds on the chassis of the unit. This may seem far too complex for some but after many years of not having a standard in my repeaters I now find it so easy to measure at all possible inputs-outputs and makes life that so much easier. All inputs and output go onto Krone blocks for intertieing the cables. Equipment for measuring the audio is old telco transmission and is protable and extremely accurate , the analog meater is about 12 inches which makes for squeezing the last bit out of precision as one can possibly do. I have seen other ways of doing audio linking and do not say my way is the only way - but it is as close to any system audio routing -trunking audio routing as on can get. My second reason for this is to be able to remotely assist a first line maintenance repeater assistant through level checking. The final is ones plots will only remain constant if the impedances are stable -this is the reason I do not like unbalanced interfaceing . Best of luck I am still in the process of trying to find web space to place all this on the web else I could explain on the pages what I have done. Bradley Glen ZS5WT NATURN UHF repeater owner --- ve7fet <[EMAIL PROTECTED]> wrote: > Ok, I've looked high and low... and come up short. > > I am curious to see just how good/bad the audio > frequency response of > my repeaters are. The problem is that I can't figure > out a good way > to go about doing it. > > I'm looking for information on how and what to use > to check/plot the > audio response through the repeater. I would also > like some info on > plotting the audio response independently of > receivers and > transmitters. A nice swept response plot is > desired... I don't really > want to plot it manually. :) > > The rest of the system is quite happy... so I figure > it is time to > punish myself and start tweaking the audio side to > make them sound > their best. Unfortunately, the audio side is > something I know little > about. > > Your help is appreciated. > > Thanks, > > Lee > > > > > > > Yahoo! Groups Links > > To visit your group on the web, go to: > http://groups.yahoo.com/group/Repeater-Builder/ > > To unsubscribe from this group, send an email to: > [EMAIL PROTECTED] > > Your use of Yahoo! Groups is subject to: > http://docs.yahoo.com/info/terms/ > > __________________________________ Do you Yahoo!? Find out what made the Top Yahoo! Searches of 2003 http://search.yahoo.com/top2003 Yahoo! Groups Links To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ To unsubscribe from this group, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
