Hi Kevin and group,
I get PTT on pin 9 and 10. before i replace parts the manual says about Q8 and
a CR5 as problems any thoughts ?
Ryan n3ssl
--- In Repeater-Builder@yahoogroups.com, Kevin Custer kug...@... wrote:
n3ssl wrote:
Hi Group,
I have a Vhf Micor unified station that was
I have 2 C-Series bandpass cavities, with individual I.L. set
at 1.0 db each. When I couple them together and measure, I
get a total I.L. of 2.9 db. I should see something like 2.1
or 2.2. I have measured the coupling cable and see .1 db,
so the cable is good. Anyone have an idea why the
The cavities were initially tuned individually and the loop positions set
for
1 db IL. They were then coupled together using a 18.5 cable and the rods
touched up to re-establish resonance. The measured IL is now 2.9. The loop
positions were not changed after coupling. When using the RL bridge I do
Any preamp like advanced receiver research would be suitable assuming one
was needed. I have never seen a Mastr III that needs a preamp. unless maybe
a tower top amp to recover feedline loss.. The front end has an awful low
noise figure to start with..
Doug
KD8B
From:
The cavities were initially tuned individually and the loop
positions set for
1 db IL. They were then coupled together using a 18.5 cable
and the rods
touched up to re-establish resonance.
If the cavities had good return loss individually, there shouldn't be a need
to touch up the
Looks to me like there is an incorrect interconnect cable length. If you are
intending to tune both to the same frequency, you should see a single response,
not two.
Chuck
WB2EDV
- Original Message -
From: Larry Horlick
To: Repeater-Builder@yahoogroups.com
Sent: Tuesday,
But were the loops adjusted to maximize return loss at the desired
inseretion loss setting? That's the key point. Or did you just dial in 1
dB of insertion loss and call it good?
Not sure what u mean??
What process did you go through when setting the insertion loss to the 1 dB
you were targetting? Did you optimize the coupling angle of the loops for
maximum return loss at (or near) the desired 1 dB of insertion loss?
--- Jeff WN3A
-Original Message-
I adjusted the loop positions, trying to maintain symmetry of the curve,
aiming for 1 db
on the analyzer. I didn't adjust the loops while looking at the RL. How
would I translate RL
into IL?
On Tue, Apr 20, 2010 at 6:02 PM, Jeff DePolo j...@broadsci.com wrote:
What process did you go through
I adjusted the loop positions, trying to maintain symmetry of
the curve, aiming for 1 db
on the analyzer. I didn't adjust the loops while looking at
the RL. How would I translate RL
into IL?
You can't directly translate from RL to IL or vice-versa. Here's how to
tune a pass cavity:
1.
Jeff,
Thanks for the detailed instructions. I understand everything, but I'm
confused about one detail.
Using this method will produce the largest RL and consequently the lowest
IL. But I don't want the
lowest IL; I want a specific value, i.e. 1 db per cavity. How do I use RLB
to set a specific
hia ll
i have 3 ,SD-220 duplexer adjust in 152 mhz rx,157mhz tx.
they are cabled for my olg GE mobile ,just like the Executive 2 .
if interested send me an email.
73/s
gervais ve2ckn
Thanks for the detailed instructions. I understand
everything, but I'm confused about one detail.
Using this method will produce the largest RL and
consequently the lowest IL.
Well, sort of. You want the most return loss AT THE DESIRED INSERTION LOSS.
Maximizing return doesn't mean you
Jeff,
But for the purpose of this exercise, setting the loops, the position of max
RL has to be the position of min. IL? No? Is my thinking completely flawed
here?
I've never used an RLB to set the loops; I've always used an SA/TG.
I also have several different tutorials on cavity tuning, but
Ryan,
A, Your problem is likely not the Station Control Module. I'm just
guessing, but I'd say JU401 needs installed on the exciter.
This circuit is sort-of a loop back - meaning PTT cannot occur on the
exciter unless Keyed A+ is delivered to the exciter, and brought back to
the SCM,
Jeff,
But for the purpose of this exercise, setting the loops, the
position of max RL has to be the position of min. IL? No?
That's what I said in #7. After you've tuned the cavity to resonance based
on RL, you check the IL. The frequency of the RL maxima (dip) should
coincide with the
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