Steve, That's good info on tuning the BP can. I will put that info in the file.
I'm pretty sure the duplexer is tuned properly. The four can BP/BR is a Sinclair 202. It's got right at 1.5 db loss on each side with about 83 db of rejection on each. There area also two Sinclair BP/BR cans. One on the TX and one on the RX. The loss is set for 0.5 db on each. The interconnect cable is RG-400, no LMR. Dwayne Kincaid WD8OYG > > Sounds like a nice setup Dwayne. I would make sure the duplexer is tuned > properly, maybe run an isolated TEE test just to be sure everything is OK. > > Next I would rotate the coupling loops to increase insertion loss and make > the skirts steeper. What Wacom taught me to do was to take a cavity, hook > up a sweeper with a TEE fitting between the Gen and Rec and set a reference > signal, then hook the TEE to one side of the cavity and rotate the loop for > about 8 db of notch at the pass freq, then move the TEE to the other side of > the cavity, and again rotate the second loop for the same degree of notch - > this makes the cavity symetrical so that both the input and output loops > have the same degree of coupling. Next measure the loss through the > cavity. Play with the degree of coupling and insertion loss till you get > what you are looking for. > > Best 73, Steve NU5D > > > RG-400 or LMR 400? sb > > > On 3/21/07, ldgelectronics <[EMAIL PROTECTED]> wrote: > > > > Steve, > > > > It's on 2M, single Station Master antenna with about 400 feet of 7/8" > > feedline. The duplexer is a BP/BR followed by a band pass can, then > > the pre, then the radio side. All cables are RG-400. > > > > The radio is GE Exec II. The sensitivity without the pre is about > > 0.35 uV. The noise floor is pretty low, but the ARR pre was picking > > up a bunch of garbage without the attenuator. > > > > Dwayne Kincaid > > WD8OYG > > > > > > -- > Ham Radio Spoken Here.....NU5D > Visit the Temple Ham Club Website > http://www.tarc.org > www.yahoogroups.com/group/Temple_arc > www.yahoogroups.com/group/60meter >
