Oops! I just found that switch on both HPN9033A power supplies- hidden beneath some nearly-invisible black tape that probably was affixed to keep it from being nudged into the continuous position. I shall now return to the kitchen for a well-earned serving of crow!
73, Eric Lemmon WB6FLY -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Eric Lemmon Sent: Monday, May 03, 2010 7:43 PM To: [email protected] Subject: RE: [Repeater-Builder] Neat kit for switching repeater devices Milt, I just looked inside both a GR1225 and an RKR1225 power supply, and found no such switch. Both power supplies are the standard, original equipment power supplies made by Duracomm and bearing Motorola part number HPN9033A. Both units have a hardwired thermal sensor that is intended to be inserted in the heat sink fins, as described in the manual. The manual makes no mention of an optional switch for fan control. There is a switch on the bottom of both power supplies, but that switch is to set the input voltage range of the power supply. What model power supply has the fan switch? 73, Eric Lemmon WB6FLY -----Original Message----- From: [email protected] <mailto:Repeater-Builder%40yahoogroups.com> [mailto:[email protected] <mailto:Repeater-Builder%40yahoogroups.com> ] On Behalf Of Milt Sent: Monday, May 03, 2010 5:23 AM To: [email protected] <mailto:Repeater-Builder%40yahoogroups.com> Subject: Re: [Repeater-Builder] Neat kit for switching repeater devices 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] <mailto:wb6fly%40verizon.net> <mailto:wb6fly%40verizon.net> > To: <[email protected] <mailto:Repeater-Builder%40yahoogroups.com> <mailto: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] <mailto:Repeater-Builder%40yahoogroups.com> <mailto:Repeater-Builder%40yahoogroups.com> > [mailto:[email protected] <mailto:Repeater-Builder%40yahoogroups.com> <mailto:Repeater-Builder%40yahoogroups.com> ] On Behalf Of Larry Horlick > Sent: Saturday, May 01, 2010 7:13 PM > To: [email protected] <mailto:Repeater-Builder%40yahoogroups.com> <mailto: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] <mailto:wb6fly%40verizon.net> <mailto:wb6fly%40verizon.net> > <mailto:[email protected] <mailto:wb6fly%40verizon.net> <mailto: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] <mailto:Repeater-Builder%40yahoogroups.com> <mailto:Repeater-Builder%40yahoogroups.com> > <mailto:Repeater-Builder%40yahoogroups.com> > [mailto:[email protected] <mailto:Repeater-Builder%40yahoogroups.com> <mailto:Repeater-Builder%40yahoogroups.com> > <mailto:Repeater-Builder%40yahoogroups.com> ] On Behalf Of Larry Horlick > Sent: Saturday, May 01, 2010 11:56 AM > To: [email protected] <mailto:Repeater-Builder%40yahoogroups.com> <mailto:Repeater-Builder%40yahoogroups.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 <[email protected] <mailto:wb6fly%40verizon.net> <mailto:wb6fly%40verizon.net> > <mailto:wb6fly%40verizon.net> > <mailto:[email protected] <mailto:wb6fly%40verizon.net> <mailto:wb6fly%40verizon.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: [email protected] <mailto:Repeater-Builder%40yahoogroups.com> <mailto:Repeater-Builder%40yahoogroups.com> > <mailto:Repeater-Builder%40yahoogroups.com> > <mailto:Repeater-Builder%40yahoogroups.com > <mailto:Repeater-Builder%2540yahoogroups.com> > > [mailto:[email protected] <mailto:Repeater-Builder%40yahoogroups.com> <mailto:Repeater-Builder%40yahoogroups.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: [email protected] <mailto:Repeater-Builder%40yahoogroups.com> <mailto:Repeater-Builder%40yahoogroups.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> > > > <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> > > > > <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> > > > <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 > > >
