I believe they are only rated at 110 Watt max, I've never seen anything
rated at 120 watts.
A mobile heat sink is rated for something like a 20/80 duty cycle, Tx/RX
respectively. I can tell you from experience, that you can run it reliably
at around 50-60% of full power IF you give it LOTS of
I believe they are only rated at 110 Watt max, I've never seen anything
rated at 120 watts.
A mobile heat sink is rated for something like a 20/80 duty cycle, Tx/RX
respectively. I can tell you from experience, that you can run it reliably
at around 50-60% of full power IF you give it LOTS of
For what its worth, I run a 300 watt solid state Henry repeater amp on my 6
meter repeater, its actually running at 200 watts and its been cruising
along for 4 years now without a problem. I changed out the 12 VDC
thermostatically controlled muffin cooling fans with 120 VAC units that come
on
Jim,
I'm interested in some 19 inch rack mount fan units; are the fans mounted
horizontal or vertical ??
What are you asking for each unit ??
Rob
-Original Message-
From: Jim [mailto:[EMAIL PROTECTED]
Sent: Sunday, August 22, 2004 11:42 AM
To: Repeater-Builder@yahoogroups.com
Subject:
Tower
distortion is always an issue when side mounting on a tower, the larger the
tower face the larger the distortion to the pattern.
Yes
mountingat greaterdistances off the tower will effect pattern /
reduce distortion from tower, but increase the mechanical torque the mount and
The J3
and J4 are for a high pass audio filter board to plug into (i.e. used in CTCSS
stations to strip tone from RX audio),as I recall J1 and J2
are10 volt and ground. However, I don't have my manual here at the
moment to verify.
The GE
Mastr II service manual clearly detailsthese (and
Given your situation and only two users on the system, you may want to
consider something in the family radio services or other none licensed radio
services, I think they are called something like FMRS and GMRS. You will
never get a commercial license for a repeater with only 2 users; remember
When you say filters and refer to loop length I assume your referring to
cavity filters, BpBr, Bp, Notch or the like. There is a whole lot more to a
cavity design/performance than just loop length and shape, a whole lot
more!! If you plan to build enough cavities for a repeater duplexer your an
Silicon Diodes drop .6 volt per diode, so 3 will drop you to 13.7 VDC, the
diode current rating needs to equal or exceed the current of the 15.5 volt
power supply. A point to consider is how stable is the 15.5 voltage output
based on load demand, i.e. if the batteries are very discharged such
I'm looking for a VHF Low Pass Filter that goes on the output of a standard
ole Celwave or DB Products circulator/IM Panel. Pls. contact me directly if
you have one for sale.
Rob K7EI
Yahoo! Groups Links
* To visit your group on the web, go to:
I've run Henry 1/4 KW repeater amps on two machines for over 4 years, both
are running strong, zero problems !!
Rob K7EI
-Original Message-
From: Jed Barton [mailto:[EMAIL PROTECTED]
Sent: Tuesday, June 15, 2004 9:23 AM
To: repeater-builder@yahoogroups.com
Subject: [Repeater-Builder] 2
The shared receive antenna is the easy part of the proposal and as others
indicated there are a couple of ways to do this. Even a cheep mobile
duplexer would likely work for feeding the two VHF receivers, as they are a
reject only duplexer and as your both receiving there is really nothing to
TX -
RX Isolation in mobiles converted to repeaters can sometime be a problem, so
anything you can do (like changing the stock coax to a mini-hard line) is going
to likely be a plus, especially at higher power levels.
Rob K7EI
-Original Message-From: Bruce Harvey
These types of radios generally won't make that kind of freq spread, if
tuned for 146 you may not always get factory spec performance with every
unit, but it will likely be close. You may be able to get some degraded
operation at 152 (couple microvolt receive and low TX power, but very
unlikely
Your going to have to give us more information RE: all the TX and RX
frequencies involved, how much power is everyone running, is the highway
dept. willing to accept some degradation in their TX power (there is no free
lunch on combining). How you couple two transmitters will be driven by
freq.
The primary reason not to run fans 24/7 is dirt, as most radio repeater
sites are generally less than clean environments, we all have to go clean
the crud out of the fans, heat sinks, power supplies, etc. on a regular
bases. The more the fan runs the faster the dirt and crud builds up inside
the
I went this road a few years ago using the small button thermal switches
(Switch Craft - etc.) that are available in a variety of on-off temperatures
settings, but it didn't prove overly successful. The small thermal switches
have to be heat sinked to the PA, so you have to route AC for the fan
I'd
check the classified ads in Communications or Two Way Radio Dealer magazines or
other trade periodicals, there use to be a number of adds offering repair and
calibration services for service monitors. It still may not be a cheep
repair, but its bound to be much less than HP factory
Don,
There have been a lot of messages over last couple months regarding using
9913 / LMR 400 type cables in full duplex operations, my take on the overall
responses by the majority of those who wrote in: don't use these types of
cables in full duplex as they lead to the very problem your
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