Appreciate the information.
I will dig the scope out and have a look at all three voltage rails.
I have not had a chance to try the password yet.
I totally agree that having a service manual will be necessary to most likely
fix this thing properly. I at least have a Motorola 2600 service monito
Hi
Does anyone know of a good source for a M57729h-01-p.
It is the UHF power module in the Kenwood TKR-820.
It is rated at 30 Watts 12 volts 440 to 470 MHz.
I found that they do not like to be operated into the wrong side of a duplexer.
For even a short time.
Is it used in any other transcei
At 5/21/2010 12:16, you wrote:
>Yup-that was me! I got that info from my dad actually back in the 70's,
>not long after he left New-Tronics.
>Here's the link to the article on RB:
> > http://www.repeater-builder.com/antenna/retuning-a-stationmaster.html
I did this mod. to a UHF StationMaster a few
I would look for a shorted tantalum capacitor hanging somewhere on the
10V rail. If you hook 10V from an outside source to the 10V buss, you'll
probably find it's drawing all kinds of current. The 10V regulator
circuit will go into fold back before burning up. This is by design. I
usually hook
i have no idea at all on what systems you run, or what they are, other than,
a repeater,
but just an idea maybe, to try.
the Controller, you refer to, that you were uploading new firmware, is that,
anything to do with the uhf system, in anyway.
if not, perhaps try shutting down the system, with t
I swapped a known good 10v card and still nothing then tried the card from this
repeater in my other repeater and it worked fine so it looks like the card is
good. Will check the backplane and see if anything looks loose...
--- In Repeater-Builder@yahoogroups.com, "Andrew Seybold" wrote:
>
> O
Or it could be one of the jumpers on the 10 Volt card has a cold joint-I
have seen this before on these cards
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Chuck Kelsey
Sent: Friday, May 21, 2010 1:59 PM
To: Repeater-Builder@yahoogroups.com
Subjec
Could be a dirty contact on the backplane.
Chuck
WB2EDV
- Original Message -
From: "w4wsm"
To:
Sent: Friday, May 21, 2010 4:45 PM
Subject: [Repeater-Builder] Lost 10 volts in a Master II UHF Repeater
>I was up on the hill this afternoon loading new firmware into a controller
>when
I was up on the hill this afternoon loading new firmware into a controller when
my UHF Master II went down. Didn't even touch the thing...
The PS is working with 15 volts out and the 3 fuses in the front are fine. The
10 volt card checked OK in my spare repeater No 10 volts at all.
Any ideas?
On 5/21/2010 10:28 AM, kc0mlt wrote:
> Hello all.
>
> I am trying to figure out if the duplexer we have put together is up
> to the task or not. Here is the situation. We have four cavities 6.5"
> dia. one is a vari-notch the others are simple reject cans. Two
> rejects are on the TX side and one r
Yup-that was me! I got that info from my dad actually back in the 70's,
not long after he left New-Tronics.
Here's the link to the article on RB:
> http://www.repeater-builder.com/antenna/retuning-a-stationmaster.html
Let me know on here if there's any questions! (The netscape addy is no
good an
I have 3 Quintron low band repeaters for sale---but I do not want to want to
violate this group if that is not appropriate.
Charlie Bennetch N4LNU
How true
you can also tune duplexers using a receiver, but you need a signal
generator. I would ask if anyone local to him has the gear to check
his setup, you can spend a long time playing with duplexers without
the right test gear, I know from experience. The other thing is insertion loss
Yes
Dont know for sure on the 1600, but for future reference the
calibration password on the IFR-1900CSA is "CSMATE" which will have to
be input from the keypad with the shift engaged. Apparently it is
written in the service manual, which I don't have. With that said you
should probably stay out of th
Yep, low isolation in the duplexer could be the problem. And the correct
thing to do is measure it. But if he doesn't have the test gear putting a
dummy load on the output of the duplexer will give a pretty good idea
whether the duplexer is tuned correctly or not. If there's no desense with a
dummy
Hi Tim
see my message, you really do need to check isolation with an analyser
I had a look at a duplexer for a chap and there was just 30dB isolation so
needless to say the desense was tremendous. It took an input signal of
around 70 microvolts to overcome desense. I retuned it on my analyser
and g
Hi
have you put a spectrum analyser on the rx port and fed, from a signal
generator, the tx freq into the aerial input making sure that the tx port
is terminated at 50 ohms. What freqs, what split. You need to know
just what level is getting to the rx port, it has to be around 70dB
rejection or you
RG-8 is not good for duplex. The braid will make TX noise and get into the
receiver. Cheap antennas can make the same problem. Test into a dummy load
right at the duplexer. If no noise then you know it's the feed line and/or
antenna.
6.5 inch dia cans are big ones so you should have plenty of isol
Hello all.
I am trying to figure out if the duplexer we have put together is up to the
task or not. Here is the situation. We have four cavities 6.5" dia. one is a
vari-notch the others are simple reject cans. Two rejects are on the TX side
and one reject and the vari-notch are on the RX si
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