What is the Moto part no. of the ps to which you refer? lh
On 5/3/10, Milt <[email protected]> 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" <[email protected] <wb6fly%40verizon.net>> > To: <[email protected] <Repeater-Builder%40yahoogroups.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: [email protected]<Repeater-Builder%40yahoogroups.com> > > [mailto:[email protected]<Repeater-Builder%40yahoogroups.com>] > On Behalf Of Larry Horlick > > Sent: Saturday, May 01, 2010 7:13 PM > > To: [email protected]<Repeater-Builder%40yahoogroups.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 > > <[email protected]<wb6fly%40verizon.net> > > <mailto:[email protected] <wb6fly%40verizon.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: [email protected]<Repeater-Builder%40yahoogroups.com> > > <mailto:Repeater-Builder%40yahoogroups.com<Repeater-Builder%2540yahoogroups.com> > > > > [mailto:[email protected]<Repeater-Builder%40yahoogroups.com> > > <mailto:Repeater-Builder%40yahoogroups.com<Repeater-Builder%2540yahoogroups.com>> > ] On Behalf Of Larry Horlick > > Sent: Saturday, May 01, 2010 11:56 AM > > To: [email protected]<Repeater-Builder%40yahoogroups.com> > > <mailto:Repeater-Builder%40yahoogroups.com<Repeater-Builder%2540yahoogroups.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 > > <[email protected]<wb6fly%40verizon.net> > > <mailto:wb6fly%40verizon.net <wb6fly%2540verizon.net>> > > <mailto:[email protected] <wb6fly%40verizon.net> <mailto: > wb6fly%40verizon.net <wb6fly%2540verizon.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: [email protected]<Repeater-Builder%40yahoogroups.com> > > <mailto:Repeater-Builder%40yahoogroups.com<Repeater-Builder%2540yahoogroups.com> > > > > <mailto:Repeater-Builder%40yahoogroups.com<Repeater-Builder%2540yahoogroups.com> > > <mailto:Repeater-Builder%2540yahoogroups.com<Repeater-Builder%252540yahoogroups.com>> > > > > [mailto:[email protected]<Repeater-Builder%40yahoogroups.com> > > <mailto:Repeater-Builder%40yahoogroups.com<Repeater-Builder%2540yahoogroups.com> > > > > <mailto:Repeater-Builder%40yahoogroups.com<Repeater-Builder%2540yahoogroups.com> > > <mailto:Repeater-Builder%2540yahoogroups.com<Repeater-Builder%252540yahoogroups.com>> > > ] On Behalf Of na4it > > Sent: Saturday, May 01, 2010 9:38 AM > > To: [email protected]<Repeater-Builder%40yahoogroups.com> > > <mailto:Repeater-Builder%40yahoogroups.com<Repeater-Builder%2540yahoogroups.com> > > > > <mailto:Repeater-Builder%40yahoogroups.com<Repeater-Builder%2540yahoogroups.com> > > <mailto:Repeater-Builder%2540yahoogroups.com<Repeater-Builder%252540yahoogroups.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 > > > > > > > > >
