[Repeater-Builder] Re: fan timer circuit

2008-12-21 Thread skipp025
Re: fan timer circuit I've seen a number of fan delay, time on, time off circuits posted on web. The neat'o web page url I just posted here on the group has one and it might be the one you're looking for. http://www.w1ghz.org/small_proj/small_proj.htm and the fan controller

Re: [Repeater-Builder] Re: fan timer circuit

2008-12-21 Thread Chuck Kelsey
Maybe it's just me, but I've never understood the need for a special circuit to run cooling fans. I run my fans from the PTT line using a relay. I have also used a simple chassis thermostat, but prefer using PTT. I suppose you could easily use both methods so that in the event that the

Re: [Repeater-Builder] Re: fan timer circuit

2008-12-21 Thread no6b
At 12/21/2008 09:24, you wrote: Some of our local start-up radio clubs throwing repeater packages in place often start out using and stay with an external RF amplifier designed for mobile operation. Sometimes the amp runs so hot you can't keep your hand on the heat sink but I've yet to see one

[Repeater-Builder] Some Receiver to External Controller Audio choices

2008-12-21 Thread skipp025
Is there a point inside the Mitrek that one can take the audio out to the controller (in this case a Link-Comm RLC-2A)? A low band Mitrek (33Mhz) Depends on what type of audio you want. The high side of the volume control is often a great place to take de-emphasized audio. However, some

[Repeater-Builder] Re: fan timer circuit

2008-12-21 Thread wb6fly
I mostly agree. My thinking is that a fan that runs continuously wastes power and draws dust and dirt into the equipment. I also believe that a fan that runs only during PTT is not doing much good except on very long transmissions- when the heat of the PA has made it to the fins. It may

Re: [Repeater-Builder] Re: fan timer circuit

2008-12-21 Thread Chuck Kelsey
I moved over to utilizing the PTT instead of the thermostat disks after I'd had a few thermostats fail. But I agree with your thinking. In my mind the slight inefficiency of running my fans earlier than the heat builds up is not significant to me. I like to think it slows the heat buildup.

Re: [Repeater-Builder] fan timer circuit

2008-12-21 Thread Paul Plack
The thermal switches sold for attic fans should work great. I bought one rated at 119ºF at a surplus store. My S-COM controllers all had start-of-activity and end-of-activity macro triggers, which would be a more elegant way to do the timer-based function than a separate board with a 555 IC.

Re: [Repeater-Builder] Re: fan timer circuit

2008-12-21 Thread Mike Naruta AA8K
One Summer's day in Los Angeles I had a service call on a microwave repeater (vacuum tube). It was located in a warehouse, near the roof. In the heat I lugged my stuff up the stairs. As I set down the service monitor I leaned my other arm against the cabinet. I jerked it away because it was

RE: [Repeater-Builder] Re: Motorola Duplexer Info Needed

2008-12-21 Thread Bill Hudson
There you go Joe! The man with all the answers! That sounds like the exact situation you have! Good work on that info! Now I'll have to go back and see what the deal was with the duplexer we had here! Bill - W6CBS _ From: Repeater-Builder@yahoogroups.com

RE: [Repeater-Builder] make some extram money (Repair Job)

2008-12-21 Thread Peter Dakota Summerhawk
Joe, Sent you an email off list and it bounced. Shoot me an email. Commconinc @ Gmail.com Thanks Peter -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Joe Sent: Tuesday, December 02, 2008 8:11 PM To:

RE: [Repeater-Builder] Manual needed Motorola S-1320A Signal Generator

2008-12-21 Thread Eric Lemmon
Arthur, I don't have a copy of the manual, but I can advise you that the manual part number is 68-81061A75, which may help you find a copy. Unfortunately, it is NLA from Motorola Parts. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com

[Repeater-Builder] Couple radio questions

2008-12-21 Thread Christopher K. Greenhalgh
Hello group. Not specifically repeater questions, but thought this group might hold the folks who have the answers... I have a Motorola Spectra VHF High Power (110 watts) that I am converting for packet use, as an APRS digi-peater. It will be a high-profile machine...probably running around

Re: [Repeater-Builder] Re: fan timer circuit

2008-12-21 Thread Mike Dietrich
Sounds like the best thing to do is a combination of both the PTT and Thermodisk versions together. That way the fan starts blowing when users start using the repeater. Then the thermodisk takes over after it heats up until all traffic quits and the tx'er cools down. Just my 2c worth. Merry

Re: [Repeater-Builder] Converting a Range 2 VHF Mitrek to Range 1 (WAS: Holiday Special...)

2008-12-21 Thread Tom Manning
GOOD AFTERNOON kEVIN This last response is my thinking about the Mitrek and is why I asked the question earlier. If the Mitrek coils are the same as the Micor coils what factor would prohibit this being done. There is considerable work to change the coils but if the Micor coils are the

Re: [Repeater-Builder] Converting a Range 2 VHF Mitrek to Range 1 (WAS: Holiday Special...)

2008-12-21 Thread Tom Manning
Hello Kevin I did not see where you gave a price of a set of Micor receiver coils. Where might I find this info? Thanks. 73 de Tom Manning, AF4UG - Original Message - From: Eric Lemmon To: Repeater-Builder@yahoogroups.com Sent: Saturday, December 20, 2008 9:37 PM

Re: [Repeater-Builder] Couple radio questions

2008-12-21 Thread Kris Kirby
On Sun, 21 Dec 2008, Christopher K. Greenhalgh wrote: It will be a high-profile machine...probably running around 30-40% TX duty cycle...possibly more during certain times. Well, you're out of what the manual specifies the duty cycle of the radio to be. Accordingly, you should look at turning

RE: [Repeater-Builder] Converting a Range 2 VHF Mitrek to Range 1 (WAS: Holiday Special...)

2008-12-21 Thread Eric Lemmon
Tom, The Mitrek coils are not the same as Micor coils. Not even close. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Tom Manning Sent: Sunday, December 21, 2008 3:40 PM To:

[Repeater-Builder] OT: Radios and Coms in TV and Movies

2008-12-21 Thread Albert
I was wondering if anyone had links to any websites that talk about radios used in TV and Movies. What got me thinking about this was that I had been watching the old TV show Emergency on Netflix. (remember squad 51, rampart hospital, etc.) I know some of the stuff is just props but I thought

Re: [Repeater-Builder] OT: Radios and Coms in TV and Movies

2008-12-21 Thread Eric M.
You can start here... http://www.emergencyfans.com/ Eric, VA3EAM Albert wrote: I was wondering if anyone had links to any websites that talk about radios used in TV and Movies. What got me thinking about this was that I had been watching the old TV show Emergency on Netflix. (remember squad

RE: [Repeater-Builder] OT: Radios and Coms in TV and Movies

2008-12-21 Thread Eric Lemmon
Albert, If you do find such a site, let me know! I was watching the Bruce Willis flick Live Free or Die Hard and noticed that every government agency and the DC Police used an ADI AR-147 2m mobile radio in their cars. I guess interoperability has finally taken hold, because every radio in the

Re: [Repeater-Builder] Converting a Range 2 VHF Mitrek to Range 1 (WAS: Holiday Special...)

2008-12-21 Thread Kevin Custer
Tom Manning wrote: GOOD AFTERNOON kEVIN This last response is my thinking about the Mitrek and is why I asked the question earlier. If the Mitrek coils are the same as the Micor coils what factor would prohibit this being done. The coils are not the same, but I believe there is no

Re: [Repeater-Builder] Re: fan timer circuit

2008-12-21 Thread no6b
At 12/21/2008 14:01, you wrote: I moved over to utilizing the PTT instead of the thermostat disks after I'd had a few thermostats fail. But I agree with your thinking. My thoughts as well: the thermostat is an elegant solution, but if it fails, your repeater fails in a rather expensive way. One

Re: [Repeater-Builder] fan timer circuit

2008-12-21 Thread no6b
At 12/21/2008 14:15, you wrote: Personal opinion, but I'd never put up a repeater that relied on a fan to keep temps within spec. Yes, fans are not as reliable as 100% passive cooling. Unfortunately, the latter method requires a lot more rack real estate which sometimes ( in my case, always)

Re: [Repeater-Builder] Re: fan timer circuit

2008-12-21 Thread Kevin Custer
n...@no6b.com wrote: One reason why I've dismissed using any switching on my 110 V cooling fans let them spin 24/7. I have used 220 V muffin fans on 110 V and they last for years. I put one in service in 1997, and it's still turning. Kevin

Re: [Repeater-Builder] Re: fan timer circuit

2008-12-21 Thread John J. Riddell
Kevin, another method of slowing down an AC fan is to put a capacitor in series with the AC leads as a voltage dropping element. A local Ham played with this idea many years ago and as I recall he started with a 1 Mfd paper capacitor. In his case he dropped the voltage to around 90 volts to

Re: [Repeater-Builder] NHRC-Squelch Board

2008-12-21 Thread Scott Zimmerman
Jordan, The RLC-MOT works very well since it is an exact copy of the squelch circuit found in the Micor. The only problem is it is now VERY expensive. Kevin had done some extensive testing on the dual squelch modues some time ago. Maybe he can chime in here... Kev?? Scott Scott Zimmerman

Re: [Repeater-Builder] Re: fan timer circuit

2008-12-21 Thread Burt Lang
One more thing to be careful of when using fans on remote equipment. Make sure there are guards on both sides of the fan. We had a muffin fan on a 100wt 220 amp that failed when a mouse tried to get closer to the warm heatsink. His carcass jammed the fan blades and got dessicated with the

RE: [Repeater-Builder] Re: fan timer circuit

2008-12-21 Thread Michael Ryan
m... From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Burt Lang Sent: Sunday, December 21, 2008 10:39 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: fan timer circuit One more thing to be careful of when

[Repeater-Builder] Rat Track Solvent?

2008-12-21 Thread Scott
Hello All I said OK to an invitation to fix a repeater that suddenly quit after years of trouble free service. Found a critical wire chewed in two and several more almosts. The fixes were easy but a problem remains in the cleanup. Rat trash and droppings (OK to read as a common four letter

RE: [Repeater-Builder] Re: fan timer circuit

2008-12-21 Thread ka9qjg
a mouse tried to get closer to the warm heatsink. His carcass jammed the fan blades and got dessicated with the heat. Burt Lang VE2BMQ Yes I guess that could Happen , I live in a City and My 6 Month old Fridge quit working , Well of Course bring a Ham Some of us including Me thing We can

RE: [Repeater-Builder] Rat Track Solvent?

2008-12-21 Thread Barry
Pretty hard to remove , I have in the past had some success with crc inox and several other derusting thread lubricants ( sorry don't know the local names in your part of the world) Most of them contain mineral turpentine and some other oils which offer the chance of at least softening that

Re: [Repeater-Builder] Rat Track Solvent?

2008-12-21 Thread Paul Plack
Whatever you do, use caution in cleaning that stuff up. Rodent droppings, especially when they become dried over time, are a major threat to carry some really vicious diseases into your body if the dust gets airborne. http://www.cdc.gov/rodents/diseases/direct_rodents.htm 73, Paul, AE4KR