That is the question isn't it. But, still, if the length is critical, it's
hard to believe that one cable could cover
the entire range from 148 to 174...
On Fri, Apr 23, 2010 at 10:00 PM, hfarrenkopf wrote:
>
>
> I think that you have to add the connector lengths to those numbers so the
> leng
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 wrote:
>
> Take a look at the link; it shows only 2 possible coupling cables, labeled
> a
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
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 t
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 We
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 r
These cans are recent vintage and have top mounted loops.
On Wed, Apr 21, 2010 at 8:24 PM, hfarrenkopf wrote:
>
>
> Are they for top mounted loops or side mounted. The side mounted loops had
> different loop lengths for the different insertion losses and hence the
> cable lengths were differen
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 la
Are they for top mounted loops or side mounted. The side mounted loops had
different loop lengths for the different insertion losses and hence the cable
lengths were different. Unless the top loops were extra large for making a
wider pass window, they should be very close in lengths (within an
OK. That makes sense. How did you arrive at 9dB for .9 IL?
And about the cable lengths between the pass cavites, I have found 3
different documents from Sinclair that gives me 3 different lengths for the
same frequency. One document shows only 2 different cable lengths for the
entire VHF band. If
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 Iq
No, using a T connector on the loop, you have a notch cavity although it is a
non symmetrical notch - doesn't matter. You adjust the loop for a notch depth
of say 9dB using the T one loop at a time and that balances the impedances of
the loops in and out so that they are the same. The notch de
1 in at 144 MHz is approx a 5% change and will affect slightly the RL esp if
the source impedance isn't 50 Ohms J0.
The overall electrical length technically is that of the coax at its VF plus
the length of the loop (in air). Adding an elbow can make a difference at this
freq.
W6 MTF
--- In Re
So you actually come up with an RL value and equate to an IL value?
lh
On Wed, Apr 21, 2010 at 9:08 AM, hfarrenkopf wrote:
>
>
> Here is how you do it..
> Take a T connector and put it on one of the pass loops. Leave the other
> loop unterminated. Adjust the loop position so that the notch
Here is how you do it..
Take a T connector and put it on one of the pass loops. Leave the other loop
unterminated. Adjust the loop position so that the notch depth is about 9dB for
0.9dB IL through if I remember correctly - this is done like measuring a notch
cavity with the spectrum analyze
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