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 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
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 wb6fly%40verizon.net To: Repeater-Builder@yahoogroups.com 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: Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com] On Behalf Of Larry Horlick Sent: Saturday, May 01, 2010 7:13 PM To: Repeater-Builder@yahoogroups.comRepeater-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 wb6...@verizon.netwb6fly%40verizon.net mailto:wb6...@verizon.net 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: Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.comRepeater-Builder%2540yahoogroups.com [mailto:Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.comRepeater-Builder%2540yahoogroups.com ] On Behalf Of Larry Horlick Sent: Saturday, May 01, 2010 11:56 AM To: Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.comRepeater-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 wb6...@verizon.netwb6fly%40verizon.net mailto:wb6fly%40verizon.net wb6fly%2540verizon.net mailto:wb6...@verizon.net 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: Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.comRepeater-Builder%2540yahoogroups.com mailto:Repeater-Builder
Re: [Repeater-Builder] Neat kit for switching repeater devices
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
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: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Milt Sent: Monday, May 03, 2010 5:23 AM To: Repeater-Builder@yahoogroups.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 wb6...@verizon.net mailto:wb6fly%40verizon.net To: Repeater-Builder@yahoogroups.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: 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 7:13 PM To: Repeater-Builder@yahoogroups.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 wb6...@verizon.net mailto:wb6fly%40verizon.net mailto:wb6...@verizon.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: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.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: Repeater-Builder@yahoogroups.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 wb6...@verizon.net mailto:wb6fly%40verizon.net mailto:wb6fly%40verizon.net mailto:wb6...@verizon.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
RE: [Repeater-Builder] Neat kit for switching repeater devices
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: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Eric Lemmon Sent: Monday, May 03, 2010 7:43 PM To: Repeater-Builder@yahoogroups.com 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: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Milt Sent: Monday, May 03, 2010 5:23 AM To: Repeater-Builder@yahoogroups.com 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 wb6...@verizon.net mailto:wb6fly%40verizon.net mailto:wb6fly%40verizon.net To: Repeater-Builder@yahoogroups.com 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: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Larry Horlick Sent: Saturday, May 01, 2010 7:13 PM To: Repeater-Builder@yahoogroups.com 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 wb6...@verizon.net mailto:wb6fly%40verizon.net mailto:wb6fly%40verizon.net mailto:wb6...@verizon.net 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: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com 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: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder
RE: [Repeater-Builder] Neat kit for switching repeater devices
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: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Milt Sent: Monday, May 03, 2010 1:17 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Neat kit for switching repeater devices 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 mailto:llhorl...@gmail.com To: Repeater-Builder@yahoogroups.com mailto: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 mailto:wb6...@verizon.net To: Repeater-Builder@yahoogroups.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: 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 7:13 PM To: Repeater-Builder@yahoogroups.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 wb6...@verizon.net mailto:wb6fly%40verizon.net mailto:wb6...@verizon.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
Re: [Repeater-Builder] Neat kit for switching repeater devices
Eric, I too have seen that but for some reason these do not have it. I'm, not certain, but I think these systems were assembled piecemeal and not ordered as a system. If that is the case the thermal switch was omitted. Anyway your solution is very simple and inexpensive. lh On Sat, May 1, 2010 at 11:04 PM, Eric Lemmon wb6...@verizon.net wrote: 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.comRepeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com] On Behalf Of Larry Horlick Sent: Saturday, May 01, 2010 7:13 PM To: Repeater-Builder@yahoogroups.com 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 wb6...@verizon.netwb6fly%40verizon.net mailto:wb6...@verizon.net 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: Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.comRepeater-Builder%2540yahoogroups.com [mailto:Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.comRepeater-Builder%2540yahoogroups.com ] On Behalf Of Larry Horlick Sent: Saturday, May 01, 2010 11:56 AM To: Repeater-Builder@yahoogroups.com Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.comRepeater-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 wb6...@verizon.netwb6fly%40verizon.net mailto:wb6fly%40verizon.net wb6fly%2540verizon.net mailto:wb6...@verizon.net 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: Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.comRepeater-Builder%2540yahoogroups.com mailto:Repeater-Builder%40yahoogroups.comRepeater-Builder%2540yahoogroups.com mailto:Repeater-Builder%2540yahoogroups.comRepeater-Builder%252540yahoogroups.com [mailto:Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.comRepeater-Builder%2540yahoogroups.com mailto:Repeater-Builder%40yahoogroups.comRepeater-Builder
[Repeater-Builder] Neat kit for switching repeater devices
I have started using this little kit (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
RE: [Repeater-Builder] Neat kit for switching repeater devices
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-buil...@yahoogroups.com] On Behalf Of na4it Sent: Saturday, May 01, 2010 9:38 AM To: Repeater-Builder@yahoogroups.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 ) 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
Re: [Repeater-Builder] Neat kit for switching repeater devices
I agree that timers for fans are a waste of time, effort and money. If you can stand a little waste of power, I like to simply key the fan with a relay driven by PTT. Sure, it starts the fan before it's needed, but to me it's no big deal. Once the repeater stops transmitting, so does the source of heat - it won't get hotter, but will cool down slowly on it's own (just like turning the burner of your stove off - the pan starts to cool right away). Chuck WB2EDV - Original Message - From: Eric Lemmon wb6...@verizon.net To: Repeater-Builder@yahoogroups.com Sent: Saturday, May 01, 2010 2:36 PM Subject: RE: [Repeater-Builder] Neat kit for switching repeater devices 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-buil...@yahoogroups.com] On Behalf Of na4it Sent: Saturday, May 01, 2010 9:38 AM To: Repeater-Builder@yahoogroups.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 ) 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 No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.814 / Virus Database: 271.1.1/2847 - Release Date: 05/01/10 02:27:00
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 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.comRepeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com] On Behalf Of na4it Sent: Saturday, May 01, 2010 9:38 AM To: Repeater-Builder@yahoogroups.com Repeater-Builder%40yahoogroups.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 ) 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
Re: [Repeater-Builder] Neat kit for switching repeater devices
I agree with Eric's assessment of the NOT running fans when not needed. I do the same thing, slightly differant. I had some left over solid state Waterbed thermostats. i wired them to switch around 109 degrees (they topped out there).I wired them backwards to when the temp got to 109 they switched on a SSR. fans would only start when needed. Saves the life of the fans,filters and cuts down on the dirt inside the cabinet. I am in the process of setting up a few PURC-5000/MSF5000 on 900Mhz and 440Mhz and they all will have this type of fan controller.The PURC has a set of three fans in a rack mount.The heatsinks are MASSIVE in this beast, takes a while for it to get warm.In Normal operation the fans will hardly run, especially if they are in a cold mountaintop site Kirk On Sat, May 1, 2010 at 11:36 AM, Eric Lemmon wb6...@verizon.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.comRepeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com] On Behalf Of na4it Sent: Saturday, May 01, 2010 9:38 AM To: Repeater-Builder@yahoogroups.com Repeater-Builder%40yahoogroups.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 ) 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
RE: [Repeater-Builder] Neat kit for switching repeater devices
On Sat, 1 May 2010, Eric Lemmon wrote: 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. If you're going to be using solar power for the repeater, it might be just as wise to invest in metal -- more heatsink area and better heatsinking. Like, for instance, the head off of an old air-cooled Volkswagen. If you don't need a fan, and the temperature rise is acceptable -- Kris Kirby, KE4AHR Disinformation Analyst
Re: [Repeater-Builder] Neat kit for switching repeater devices
Hey Eric, The circuit board to the right in your picture; Is that the controller and if so, what brand and model ? Tnx, Mike KB5FLX - Original Message - From: Eric Lemmon To: Repeater-Builder@yahoogroups.com Sent: Saturday, May 01, 2010 7:28 PM Subject: RE: [Repeater-Builder] Neat kit for switching repeater devices 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-buil...@yahoogroups.com] On Behalf Of Larry Horlick Sent: Saturday, May 01, 2010 11:56 AM To: Repeater-Builder@yahoogroups.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:wb6...@verizon.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@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of na4it Sent: Saturday, May 01, 2010 9:38 AM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.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 ) 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
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 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.comRepeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com] On Behalf Of Larry Horlick Sent: Saturday, May 01, 2010 11:56 AM To: Repeater-Builder@yahoogroups.com 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.netwb6fly%40verizon.net mailto:wb6...@verizon.net 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.comRepeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.comRepeater-Builder%2540yahoogroups.com [mailto:Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.comRepeater-Builder%2540yahoogroups.com ] On Behalf Of na4it Sent: Saturday, May 01, 2010 9:38 AM To: Repeater-Builder@yahoogroups.com Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.comRepeater-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 ) 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
RE: [Repeater-Builder] Neat kit for switching repeater devices
It looks very professionally done. I use something similar, except that it is glued to a heat sink fin. Richard www.n7tgb.net The problem with socialism is that eventually you run out of other people's money --Margaret Thatcher _ From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Eric Lemmon Sent: Saturday, May 01, 2010 5:29 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Neat kit for switching repeater devices 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@ mailto:Repeater-Builder%40yahoogroups.com yahoogroups.com [mailto:Repeater-Builder@ mailto:Repeater-Builder%40yahoogroups.com yahoogroups.com] On Behalf Of Larry Horlick Sent: Saturday, May 01, 2010 11:56 AM To: Repeater-Builder@ mailto:Repeater-Builder%40yahoogroups.com yahoogroups.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. mailto:wb6fly%40verizon.net net mailto:wb6...@verizon. mailto:wb6fly%40verizon.net 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@ mailto:Repeater-Builder%40yahoogroups.com yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@ mailto:Repeater-Builder%40yahoogroups.com yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of na4it Sent: Saturday, May 01, 2010 9:38 AM To: Repeater-Builder@ mailto:Repeater-Builder%40yahoogroups.com yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: [Repeater-Builder] Neat kit for switching repeater devices I have started using this little kit (http://www.electron http://www.electronickits.com/kit/complete/elec/ck1614.htm ickits.com/kit/complete/elec/ck1614.htm http://www.electron http://www.electronickits.com/kit/complete/elec/ck1614.htm ickits.com/kit/complete/elec/ck1614.htm http://www.electron http://www.electronickits.com/kit/complete/elec/ck1614.htm ickits.com/kit/complete/elec/ck1614.htm http://www.electron http://www.electronickits.com/kit/complete/elec/ck1614.htm ickits.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
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
