Take a look at the link; it shows only 2 possible coupling cables, labeled as part no. 4 in Diagram 1. The range 138-148 requires a 22" cable and 148 to 174 requires a 19" cable.
http://www.repeater-builder.com/sinclair/ci-1122-C-Series-Parts.pdf lh On Fri, Apr 23, 2010 at 5:15 PM, hfarrenkopf <[email protected]> wrote: > > > No, I am absolutely positive that to get 0.9dB IL per Sinclair VHF bandpass > cavity, the notch depth tuning of the loop is between 11 and 11.5dB. I have > done it probably more than 100 times. The T goes on one loop and the other > loop is left unterminated. > > 18" sounds too short. It should be 22 to 23" according to my memory. > > When the cable is perfect, no fine tuning of the cavity frequency is > required. But nothing is perfect so a small tweek may be required to get the > system tuned perfectly but not by much. > > > --- In [email protected]<Repeater-Builder%40yahoogroups.com>, > Larry Horlick <llhorl...@...> wrote: > > > > Harold, > > > > I think 24" is for the lower part of the band. I've cut these 18.5". I > used > > your procedure today and it went well although the dips for .9 IL were > 4.3 > > dB instead of your 9.0 dB. I connected everything together and ended up > with > > 3.3 dB total after tweaking each pass rod slightly. > > > > lh > > > > On Wed, Apr 21, 2010 at 9:46 PM, hfarrenkopf <hfarrenk...@...> wrote: > > > > > > > > > > > I don't know if it was published.. Set your cans for 0.9dB IL each and > your > > > end result will be 3.2dB. The notch cavity should be set to maximum > depth > > > unless you have a very close frequency down the chain (<0.5MHz > away).The > > > notch is tuned to the pass frequency. > > > > > > The 3 pass cans will produce 3 return loss dips - remember to use a > load on > > > the unterminated ports of the filter when using the RTB. > > > > > > I can't locate the length of the cable between the pass cans but I > think my > > > memory is saying 23 inches tip to tip. > > > > > > > > > --- In > > > [email protected]<Repeater-Builder%40yahoogroups.com> > <Repeater-Builder%40yahoogroups.com>, > > > > Larry Horlick <llhorlick@> wrote: > > > > > > > > Harold, > > > > > > > > I used 2 cans in my initial post for simplicity. What I'm working on > is a > > > > 2037, 3 pass and one notch and I need 3 dB, so 1 dB per can. I'm not > > > moving > > > > them very far from the original setup, but I want to verify the IL. > Is > > > there > > > > a published chart for these settings? > > > > > > > > Indeed, still in VY0 land... > > > > > > > > > > > > lh > > > > > > > > On Wed, Apr 21, 2010 at 7:54 PM, hfarrenkopf <hfarrenkopf@> wrote: > > > > > > > > > > > > > > > > > > > Just looked up the settings in my files. 9dB notch at 160MHz > produces > > > > > 1.4dB. 11 to 11.5 will produce your desired 0.9dB Insertion Loss. > > > > > 14 to 15 dB produces the 0.40dB IL. > > > > > > > > > > The cable adds 0.2dB. The settings of 2 cans from Sinclair are > > > typically > > > > > 1.0, 2.0 or 3.0dB. > > > > > > > > > > Larry, are you still up in Iqaluit? > > > > > > > > > > Harold, VA3HF > > > > > > > > > > > > > > > > > > > > > > > >
