I think that you have to add the connector lengths to those numbers so the length would be 20.25" tip to tip if that 19 was the length of the cut coax.
--- In Repeater-Builder@yahoogroups.com, Larry Horlick <llhorl...@...> wrote: > > 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 <hfarrenk...@...> 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 Repeater-Builder@yahoogroups.com<Repeater-Builder%40yahoogroups.com>, > > Larry Horlick <llhorlick@> 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 <hfarrenkopf@> 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 > > > > Repeater-Builder@yahoogroups.com<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 > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > >
