Having problems with a SPECTRUM 4000 UHF repeater that the voltage regulation
works ok on RX, but when you kick it into TX, the SCR fires and blows the fuse
or frys the resistor.
This is the newer version power supply board that has the current limit control
on it.
We replaced the SCR and .25
Could it be RF triggering the SCR?
Jerry W9FS
- Original Message -
From: Ed
To: Repeater-Builder@yahoogroups.com
Sent: Thursday, October 15, 2009 9:17 AM
Subject: [Repeater-Builder] Spectrum UHF Repeater SCR Crowbar circuit
activating during TX
Having problems with a
A test you might try... find one or two fairly large
(value) Electrolytic Capacitors as (or similar to the
one already) installed in the power supply.
With relatively short clip leads or decent wire, parallel
one of the filter caps across the original Power Supply
filter and if you have a
Sometimes same amplifier used for VHF High-Band and UHF
can be modified up/down to the 224 MHz band... but the
conversion project is not for the faint of heart.
In the case of the Micor PA... they are not an easy
mod by any means and I was never able to get more
than about 45% of the
Hi All,
That X9000 'consolette' didn't work with all the secure boxes
stuff attached, but I removed the radio, control head added a
standard cable, reprogrammed it, and it works.
Anyway, the power supply that was inside is marked HPN 1000A.
Anybody have a schematic or spec sheet on it? It
J and the Group,
I have a converted MICOR mobile one 220 with a Toshiba amplifier module in it
set to 15 W out driving a TE Systems 2206RN amplifier with 65 W out. In Skipps
vault on Mt. Vaca and it has been working flawlessly since its installation,
four years ago. The TE Systems, amplifier
Skipps idea sounds good to me. It's possible that the filter cap has
gone bad. When the transmitter puts a load on the power supply, some AC
ripple is getting through that trips the crowbar.
73, Joe, k1ike
skipp025 wrote:
A test you might try... find one or two fairly large
(value)
Am assisting in an estate (I'm an oldie that works CW on 160m so this is stuff
is strange to me). Anyway, there is an antenna in the mess that we cannot
identify. The SK was DEEP into VHF UHF (ran 2 repeaters just for him and XYL)
so feel it is in that range.
Heres the poop: (at least all
Walt,
Please take a picture ans post it. We maybe able to identify it visually.
Tim
On 10/15/09, sjotrollet sjotrol...@yahoo.com wrote:
Am assisting in an estate (I'm an oldie that works CW on 160m so this is
stuff is strange to me). Anyway, there is an antenna in the mess that we
cannot
OK Tim, tks for the response. I'll probably be able to borrow a digital camera
from my
son and do so maybe next week.
73
Walt (N4GL)
--- On Thu, 10/15/09, Tim Herron ki6...@gmail.com wrote:
From: Tim Herron ki6...@gmail.com
Subject: Re: [Repeater-Builder] Need help
To:
Hi Walt,
Measure the radials of the ground plane, that might get you close. If there
near about 6 inches then its UHF, if they are near around 15 to 18 then it
would be in the VHF rage. But a picture could help some one spot it right away.
Regards
-Richard
The only Antenna Specialists antenna I could find that meets your description
is a Base Commander Model ASP-680 series. There were 8 models covering from 146
to 174 MHz. The ASPA-680 covered from 146 to 149.5 MHz. This is a collinear
antenna that has 3 dbd gain and was rated at 350 watts
When the transmitter puts a load on the power supply, some AC
ripple is getting through that trips the crowbar.
73, Joe, k1ike
It could easily be any one of the electrolytics on the regulator board. I'd
shotgun them all with new. I've seen this problem cured with new caps.
Laryn K8TVZ
Our repeater is coordinated on a given two meter frequency. Due to terrain and
other factors, we were forced to agree to some interference from a neighboring
repeater, on the same frequency. The neighboring repeater is located on a peak
roughly 100 miles away from us, and roughly 1800 feet
Visit Booth 1063 at Neuroscience 2009
- Original Message -
From: Nikon Instruments Inc.
To: socam...@bellsouth.net
Sent: Thursday, October 15, 2009 6:45 PM
Subject: Your Guide to Nikon at Neuroscience
If you have difficulty reading this email, click here.
Featured
Tim,
The information is on page 47 of the manual here:
www.repeater-builder.com/mitrek/pdfs/mitrek-super-consolette-station-manual
-68p81040e80a.pdf
73, Eric Lemmon WB6FLY
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of
Your ERP will be around 55-60 watts given the info provided. I de-rated the dBi
by 2 dB to give you dBd. I think that's correct. So your overall gain is only
1.25 dB.
Chuck
WB2EDV
- Original Message -
From: Randy Ross
To: Repeater-Builder@yahoogroups.com
Sent: Thursday,
--- On Thu, 10/15/09, Randy Ross rr...@librtynet.com wrote:
From: Randy Ross rr...@librtynet.com
Subject: [Repeater-Builder] Maybe a strange question...
To: Repeater-Builder@yahoogroups.com Repeater-Builder@yahoogroups.com
Date: Thursday, October 15, 2009, 9:04 PM
Our repeater
Thanks Eric!!!
Tim
--- In Repeater-Builder@yahoogroups.com, Eric Lemmon wb6...@... wrote:
Tim,
The information is on page 47 of the manual here:
www.repeater-builder.com/mitrek/pdfs/mitrek-super-consolette-station-manual
-68p81040e80a.pdf
73, Eric Lemmon WB6FLY
-Original
I had a similar problem with a home brew supply.
My fix was a choke (100 uHy)in series with the gate as close to the
gate a possible.
I bypassed the choke on both sides with 0.01 uF capacitors with leads
as short as possible.
This fixed my problem.
You are probably rectifying RF inside the SCR.
Randy, it's pretty common these days for a transceiver in a valley to have much
higher useful sensitivity than a receiver at a high repeater site, because your
noise floor may be much lower, and the front end of the repeater's receiver may
require much higher selectivity.
It is also possible
The paralleled Electrolytic caps into the power supply test
I mentioned is a relatively easy test before one goes in for
a mod. The Spectrum Crowbar Circuit was working and something
obviously changed with age.
Then I would focus my attention to the SCR Crowbar Circuit.
Something not
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