The original GR1225 power supply was a linear Astron SL-14M good for 7A
continuous and 14A @ 20% duty cycle. It had 2 molex connectors on the back,
one for the high current DC and the other, a 6 pin, for the fan.
The current product is HPN9033A a Duracomm RP-15 switcher with a high current
pigtail and a second pigtail for the fan. THese have the switch just below the
pigtails that either runs the fan constantly or follows the thermal switching.
Milt
N3LTQ
----- Original Message -----
From: Larry Horlick
To: Repeater-Builder@yahoogroups.com
Sent: Monday, May 03, 2010 9:21 AM
Subject: Re: [Repeater-Builder] Neat kit for switching repeater devices
What is the Moto part no. of the ps to which you refer?
lh
On 5/3/10, Milt <men...@pa.net> wrote:
Eric,
The power supply on the RKR and GR series repeaters has a switch which
controls the action of the fan. It can either be thermally controlled or
run constantly.
Milt
N3LTQ
----- Original Message -----
From: "Eric Lemmon" <wb6...@verizon.net>
To: <Repeater-Builder@yahoogroups.com>
Sent: Saturday, May 01, 2010 11:04 PM
Subject: RE: [Repeater-Builder] Neat kit for switching repeater devices
> Larry,
>
> That's odd; both the GR1225 and RKR1225 repeaters I am familiar with,
> which
> use the R1225 transceiver, have a small thermal switch that is wedged
> between two of the heat-sink fins. In both repeaters, the fan runs only
> when the radio gets hot. I am surprised that you have a repeater using
> the
> R1225 in which the fan runs continuously. Perhaps this installation is a
> prime candidate for a thermal switch!
>
> 73, Eric Lemmon WB6FLY
>
>
> -----Original Message-----
> From: Repeater-Builder@yahoogroups.com
> [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Larry Horlick
> Sent: Saturday, May 01, 2010 7:13 PM
> To: Repeater-Builder@yahoogroups.com
> Subject: Re: [Repeater-Builder] Neat kit for switching repeater devices
>
>
>
> This is excellent Eric. I have an R1225 repeater in a GR500 case. There
is
> a
> fan but it runs continuously. The duty cycle is low but because of the
> nature of
> the service there are times when it may be very high for extended periods
> of
> time.
> So most of the time the fan is not needed, but I want it there for those
> rare occasions.
> I don't recognize the part no. on the fan it looks remarkably similar to
> the
> one stock in
> GR500. This will work very well for me. Thanks.
>
> lh
>
> On Sat, May 1, 2010 at 8:28 PM, Eric Lemmon <wb6...@verizon.net
> <mailto:wb6...@verizon.net> > wrote:
>
>
>
>
> Larry,
>
> My first use of this thermal switch was on a solar-powered Motorola
> R1225
> UHF repeater at a commercial site. I simply drilled and tapped two
> 4-40
> holes on a flat portion of the outside fin, and mounted the thermal
> switch
> after applying some heat-conductive paste. I used a three-inch
> low-EMI
> Panasonic fan blowing right on the fins. This is a 45-watt repeater
> set for
> about 30 watts output. It went into service early in 2003, and has
> been
> trouble-free ever since. I have attached a picture of what it looks
> like.
>
> 73, Eric Lemmon WB6FLY
>
> -----Original Message-----
> From: Repeater-Builder@yahoogroups.com
> <mailto:Repeater-Builder%40yahoogroups.com>
> [mailto:Repeater-Builder@yahoogroups.com
> <mailto:Repeater-Builder%40yahoogroups.com> ] On Behalf Of Larry Horlick
> Sent: Saturday, May 01, 2010 11:56 AM
> To: Repeater-Builder@yahoogroups.com
> <mailto:Repeater-Builder%40yahoogroups.com>
> Subject: Re: [Repeater-Builder] Neat kit for switching repeater
> devices
>
> Eric,
>
> This is good info. I have an immediate use for this. How have you
> actually
> attached this 'stat to the fin?
>
> Larry
>
> On Sat, May 1, 2010 at 2:36 PM, Eric Lemmon <wb6...@verizon.net
> <mailto:wb6fly%40verizon.net>
> <mailto:wb6...@verizon.net <mailto:wb6fly%40verizon.net> > > wrote:
>
>
>
> Scott,
>
> I must agree that the CK1614 is an extremely versatile timer, with
> many
> potential uses. However, using it for fan control is not only
> expensive,
> but unnecessary.
>
> A fan blowing on a transmitter heat sink does absolutely nothing
> immediately
> after the transmitter is keyed, since the heat sink is likely at
> ambient
> temperature. It takes a period of time for the heat sink to warm up,
> so
> operating the fan prematurely is a waste of energy- which may be an
> issue
> for a solar-powered repeater.
>
> IMHO, the most efficient means of fan control is also the cheapest:
> A
> thermal switch. My first choice is a Cantherm #R2005015
> normally-open
> thermostat that closes at 50 degrees Celsius, about 122 degrees
> Fahrenheit.
> When attached to a heat-sink fin, it turns the fan on when
> necessary, and
> keeps it on until the heat sink cools below about 100 degrees F-
> around body
> temperature. This particular switch is available from Digi-Key for
> about
> $9, as Catalog Number 317-1094-ND.
>
> 73, Eric Lemmon WB6FLY
>
>
> -----Original Message-----
> From: Repeater-Builder@yahoogroups.com
> <mailto:Repeater-Builder%40yahoogroups.com>
> <mailto:Repeater-Builder%40yahoogroups.com
> <mailto:Repeater-Builder%2540yahoogroups.com> >
> [mailto:Repeater-Builder@yahoogroups.com
> <mailto:Repeater-Builder%40yahoogroups.com>
> <mailto:Repeater-Builder%40yahoogroups.com
> <mailto:Repeater-Builder%2540yahoogroups.com> > ] On Behalf Of na4it
> Sent: Saturday, May 01, 2010 9:38 AM
> To: Repeater-Builder@yahoogroups.com
> <mailto:Repeater-Builder%40yahoogroups.com>
> <mailto:Repeater-Builder%40yahoogroups.com
> <mailto:Repeater-Builder%2540yahoogroups.com> >
> Subject: [Repeater-Builder] Neat kit for switching repeater devices
>
> I have started using this little kit
> (http://www.electronickits.com/kit/complete/elec/ck1614.htm
> <http://www.electronickits.com/kit/complete/elec/ck1614.htm>
> <http://www.electronickits.com/kit/complete/elec/ck1614.htm
> <http://www.electronickits.com/kit/complete/elec/ck1614.htm> >
> <http://www.electronickits.com/kit/complete/elec/ck1614.htm
> <http://www.electronickits.com/kit/complete/elec/ck1614.htm>
> <http://www.electronickits.com/kit/complete/elec/ck1614.htm
> <http://www.electronickits.com/kit/complete/elec/ck1614.htm> > > ) for fan
> control on repeaters. I can also be used as a PTT and Time Out
> circuit,
> along with a lot of other uses.
>
> Download the pdf on that site and check it out.
>
> Scott NA4IT
>
>
>
>
>
>
>
>
>
>
> ------------------------------------
>
>
>
> Yahoo! Groups Links
>
>
>
