Let me first say thanks to everyone for all of their input and information.
I am familiar with the NAB6064A/B heliflex antenna but do not actually have one
of those. I do actually own one of the Centurion/Antennex model EXL antennas
that Milt mentioned. The only down side is I do not have the
I am new to the amateur radio community but have been drawn to some of the
older Motorola gear since I started. I did not know this man but I am
marginally familiar with the portable clinic website because of my interest in
Motorola portables. (You can't tell by my last few posts can't
I am a very big fan of the Micor bi-level squelch. It's action is
second to none on my 440 and 900 system however, I too am having the
exact same problem on my 29.540 receiver in carrier squelch. I just
will not take anyone into the noise but rather near quieting signals
just pop out and
Hi Wade,
You're correct. Ground the PTT pin to TX. Mic audio would go to the TX
audio output on the controller, or else this is gonna be a rally
quiet repeater. ;)
Brian
N4BWP
kc0mlt wrote:
Am I correct in thinking to ground the PTT connection to get it to key
up? Just looking
I agree with Eric.
Unfortunately, new repeater owners sometimes can't resist tweaking the
last transmit can for maximum power output. If it is a BP/BR can, there
goes your receiver isolation.
73, Joe, K1ike
Eric Lemmon wrote:
Norm,
If the Q202-G duplexer is tuned exactly to spec, you
In your experimentation, were you using 4 diam 450 MHz cans
operated at 3/4 wave for 1296 or 4 cans at 1/4 wave
(stubbies !) for 1296 ?
I used both. I used UHF 4 pass cavities as 3/4 wave resonators, and also
took 900 MHz 1/4 wave cavities and cut down the center to shorten them. In
both
Alex, if memory serves, the component differences for the lowband
audio/squelch board are documented in the manual. I don't remember if the
station and mobile boards both have different components for lowband, or if
it was just the station. I also don't remember if the SpectraTAC audio
board
Also, this project is designed to use in a mostly stationary
situation, and I was thinking of incorporating a spring or
something similar at the base of the antenna to minimize the
shock to the antenna connector.
Using your idea, how about a small spring at the base, followed by a
With a preamp, if you're only getting -106 dBm sensitivity, something is
wrong. If memory serves, the spec for 12 dB SINAD without the preamp for a
highband Mastr II is 0.35 uV (-116 dBm), and with the UHS preamp the
sensitivity was 6 dB better (-122 dBm).
Looking at the GE isolation curves,
I wonder what the diameter of the center element, or plunger, was?
Joe
Jeff DePolo wrote:
I used both. I used UHF 4 pass cavities as 3/4 wave resonators, and also
took 900 MHz 1/4 wave cavities and cut down the center to shorten them. In
both cases they were TX-RX 4 cavities. Also, the
No, not worried about max power through the cans. I have a db-224 at 270' with
about 330' of LDF7-50a feeding it. I figure about 1db feedline loss so most of
what comes out of thr cans gets to the antenna anyway. More worried about the
repeater being able to repeat eveything it CAN possibly
Jeff,
I agree completely with your conclusions. When tuned on my vector network
analyzer, I have often been able to achieve 90 dB of isolation on both sides
of a Sinclair Q202G duplexer at 2m. The key to getting this kind of
performance is not just tuning each can individually for optimum
Wow, lots of great info there.
I do have the PLL exciter.
It is working better after I adjusted the cans yesterday, but I am wondering if
I need to spend the time to tweak it more.
Thanks for your input... EVEREYBODY!
De N5NPO
Norm
- Original Message -
From:
Ok Eric,
You just brought up something...
My cans are SANS cabinet. Two of the cans at least, have serial numbers and
model numbers on them. I am seriously now thinking that this is a frankenstien
monster duplexer made from cans from more than 2 set. The tuning rods on the
one pair have
Norm,
The tuning rods on the TX pair of cavities will be at different heights than
those on the RX pair, simply because they are tuned to different
frequencies. As for the RG-142 jumpers, that's okay because RG-142 is
double-shielded. Changing those jumpers to RG-214/U will probably gain you
We use quite a few Trident controllers (Raiders), they will do LTR
conventional.
Came across a number of the SEA Trident units several years ago, Trident
advised chip sets were all custom, and units would only work with SEA or
EFJ ACSB units. They were correct, seriously tried, no luck.
The
Ok,
It is not the rod lenght sticking up, it is the set screws and adjustment nuts
(bolts?) That are different. One side has 2 on each can and the other side has
3 on each can.
The RG-142 jumpers are pretty short. I really doubt that they are 12 inches
from tip of N male to tip of N male. The T
Kenwood TK-760-1 VHF 144-174 MHz, 32ch, 25 Watt, Mobile Mounting Bracket
Programming Cable and Software
Kenwood KMC-9 Desk Mic
SEC 20 Amp 12 volt low profile regulated power supply
50 ft rg8
2 x pl259 teflon/silver
Cushcraft Ringo Ranger II ARX-2b
$275.00 + Shipping
Norm,
Thanks for that clarification. Your duplexer is the later model, just like
mine. My harness drawing applies only to the later model.
Regarding the jumper length, it is NOT tip-to-tip of the cable; it is the
horizontal distance between the centers of each tee, with the jumper cable
in
Mr. Kelsey, I was unable to open or read your attachment. I too am intreested
in the subject of proper grounding and lightning protection. Would you please
repost that link or the document in some other manner?
Thank you and I appreciate many of the contributions you have made to this
hobby
Responded with direct email.
Chuck
WB2EDV
- Original Message -
From: Rich aquame...@yahoo.com
To: Repeater-Builder@yahoogroups.com
Sent: Sunday, July 12, 2009 12:22 PM
Subject: [Repeater-Builder] Re: Lightning Protection
Mr. Kelsey, I was unable to open or read your attachment. I
re: Hamtronics Early Receiver Info Wanted (please)
OK, some of you guys stop laughing now... this is a sincere
request.
Any of you have docs (Manual or circuit diagram) for the following
Hamtronics receivers... the manuals of which are not available on
their (the Hamtronics) web page.
I've
Matthew Kaufman wrote:
GE:
12+ Mastr Exec low-power full-duplex mobiles, 77 range (SX55FAS77A)
with internal mobile duplexer
Misc spare control heads, high-power Mastr Exec PAs, etc.
All the GE gear is spoken for.
LDG:
1 RVS-8 repeater voter
This item is now listed on eBay at:
Matthew Kaufman wrote:
6 R304-2 UHF synthesized receiver, wired and tested, mounted in A89
enclosure
Now at http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=250463620430
3 T304-2 UHF synthesized exciter, wired and tested, mounted in A88
enclosure
Now at
The tuning of the Centurion antenna is very simple, tune the trimmer cap for
maximum transmitted signal. Use anything that gives an indication; service
monitor, field strength meter, whatever. You will only cover at most 1 MHz
with ANY antenna on low band other than a couple of specially
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