Hi kids
I'm tuning up a T1504A, which has the 430 - 470 cable set on it. Everything
looks good, except for one cavity - one of the lowpass/hi reject ones. I
can't seem to get a very good null on it, regardless of the loop position.
As a matter of fact, the reject seems to be getting better when
Ken Arck wrote:
Hi kids
I'm tuning up a T1504A, which has the 430 - 470 cable set on it. Everything
looks good, except for one cavity - one of the lowpass/hi reject ones. I
can't seem to get a very good null on it, regardless of the loop position.
As a matter of fact, the reject seems to be
Ken,
Having refurbished and tuned a number of those cavities, I
would suspect it may not be getting a good low resistance
contact between the end of the coupling loop and the inside
of the cavity. I would suggest taking it apart and
thoroughly cleaning the inside of the cavity... especially
At 08:22 PM 5/1/2004 -0400, you wrote:
Ken,
Having refurbished and tuned a number of those cavities, I
would suspect it may not be getting a good low resistance
contact between the end of the coupling loop and the inside
of the cavity.
---Thanks Paul but I have already looked at the interior.
As a matter of fact, the reject seems to be getting better when it runs
up against the outside edge of the adjustment slot. But I never find a
definate point. The other 3 cavities are great - a nice, sharp, deep null,
just about centered in the slot.
I would guess you verified the 'rough'
Ken,
Assuming that the suspect cavity is not damaged or dented, the only
cause I can think of for the symptom you describe is a poor contact at
the grounded (adjustment) end of the loop. A lot of crud, not to
mention spiders, can enter the cavity through the open slots. I'm
pretty certain that
At 08:50 PM 5/1/2004 -0400, you wrote:
I would guess you verified the 'rough' adjustment to be in the same
position as the other three?
---It's nowhere near where the others are. Same coupling loops, oriented
the same way as the other lowpass/hi reject too. The internals looks fine
and clean.
At 07:09 PM 5/1/2004 -0700, you wrote:
Do you already have the loop moved to the 2nd hole which allows for more
adjustment. Just thought I would ask.
---Haven't tried that yet but the other lowpass cavity (the one that
appears to be ok) has the coupling loop in the same hole.
Ken
On Sat, 1 May 2004 18:31:27 -0700, Daron J. Wilson wrote:
Any other ideas?
We use to use them when installing alarm system in cars
and trucks, for the pin switches under the hood. They
were angle brackets (heavy) and were about 2.5 from
the bend to the ends.
Used them many times for custom
Ken,
You're right about this problem being a stumper! It seems as if you
have checked all the obvious things, and still, it does not work. Has
this duplexer worked before? If you don't know from personal experience
that it was working properly before it came into your hands, perhaps the
prior
They weren't designed for the 470-512 MHz band, were they?
Joe M.
Ken Arck wrote:
Hmmm, here's a kicker
At 3 megs above the pass frequency, I can adjust for a sharp, deep
null about centered in the slot. At 4 megs above, it starts to get
noticeably wider and almost to the outside
I've tuned a bunch of them up (have several waiting to go through the
spectrum analyzer in the next few weeks). I have several copies of the
manual, if you need one. I've ordered the parts and converted lots of the
pass-only Motorola cans to two and four pass/reject combination duplexers
over the
At 01:02 AM 5/2/2004 -0400, you wrote:
Have you swapped the loops/probes from the problem can with the ones in
another can to see if it's a problem with the can itself or with the
loop/probe elements? Swapped any cables?
---Yea, I've had good luck with 1504s before too (this isn't my first set
If these are just mounts, and not the slide mounts that was back in the 70's
and 80's, there is a place in Michigan that has several models of them. A-1
Telecom. The company that is producing them is Pro-Trucker. Better built
than the ones Radioshack recently discontinued. If these are the
Combination#DC65UAU88B
VERY CLEAN
GE POWER SUPPLY
AUDIO CONTROL CARD
NEW MASTR II RECEIVE PRE AMP/Needs to be plugged in
HAM SPLIT 444.525 OUTPUT
GE DECIBLE FACTORY DUPLEXER
30 CABINET DOORS LOCKS
SIMPLE VOICE RECORDER ID'er
SPARE UNUSED 100 WATT PA---WILL NOT SEPARATE
SCOM 6K CONTROLLER IF
Hi All:
I have this standard Signal
generator Model 80 and I am in need of a manual. Anyone have one of these
kicking around Copy will do
Ray
VE5RAE
Yahoo! Groups Links
To visit your group on the web, go to:http://groups.yahoo.com/group/Repeater-Builder/
To unsubscribe from
Easy to find. Look at Mounts and Stands
http://www.randl.com/cgi-local/cart/cart.cgi?cart=Searchgroupnumber=(8
160)
http://www.universal-radio.com/catalog/misc.html
Hmm, I guess I'm search-challenged this morning. I went to both sites,
nice spots, the first one had 60 mounts for amateur
Daron, I guess I didn't know exactly what you wanted to do. Are you trying
to stack the radios?
I went to a CB store and then had lots of brackets and hump mounts. I like
the hump mount because it had little teeth that hold the base on the carpet
without moving, and had a built in 5 inch
When I pulled the coupling loop assembly from the bad cavity, it looked
fine to me. Although I noticed the connection to the S0239 had apparently
been resoldered at some point in the past on the adjusted one). I didn't
think about the resoldering job too much. Until this morning that is, when
I
Check out www.ddbunlimited.com they make inside and outdoor cabinets
also make a little battery box that might work.
Ray
Mike Morris WA6ILQ [EMAIL PROTECTED] wrote:
At 01:40 PM 5/1/04 -0500, you wrote:I am building a repeater with two TK840's. Where can I get a case so I canput a power supply ,
Bradley,
I'm not sure what type of the many collinear
antennas you're trying to match. Are you working
on a coaxial type or an aluminum tube type.
Many collinear type antennas can be broken into
sections and matched at each section. You give
us a bit more info, we'll give you a few more
Does anyone have any information on the style and frequency range of
the xtals for this unit? Thanks!
Yahoo! Groups Links
* To visit your group on the web, go to:
http://groups.yahoo.com/group/Repeater-Builder/
* To unsubscribe from this group, send an email to:
[EMAIL
http://www.valuetronics.com/products/servicemonitors/
--- uplink28 [EMAIL PROTECTED] wrote:
Can anyone be kind enough help me in how to set up
an IFR-1200 w/ the
tracking generator option for aligning a BpBr
duplexer? I have access
to the monitor but there are no books on it. Thanks.
I checked that link and all it takes me is to a form to check on prices of
different monitors. Poked in other parts of the web site and don't see much
else.
I would be interested in that information myself and also how to set up a
General Dynamics R2590 to do the same thing.
Rich
-Original
Hello,
New items/info below, please check.
Because this stuff is heavy I would prefer not to ship them unless the buyer
is willing to pay for professional packing plus the shipping. The two I
shipped ran almost $40.00 each for the shipping cost. I would prefer either
local pickup or pickup at
Thats the first time i have ever heard of that Great JOB Ken !!
RayKen Arck [EMAIL PROTECTED] wrote:
When I pulled the coupling loop assembly from the bad cavity, it lookedfine to me. Although I noticed the connection to the S0239 had apparentlybeen resoldered at some point in the past on the
I just picked up a MICOR UHF Repeater that needs a PA deck. I'd like to
find a TLE171X Series (20, 45 or 75 Watt). I know the 75 watt 450-470 MHz
version is a TLE1713A, but if I have a choice of power levels, I'd prefer
the 20 or 45 watt 450-470 Range amp (those are probably TLE1711A and
TLE1712A
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