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#21
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Avionics (Radio Problem) Narrowed Down... I Think???
I didn't mean to start an argument, I just wanted to know what I was dealing
with. Now that I know it is a relay, I can tell you how to replace it with a genuine Radio Shack part if you wish. Give me the manufacturer and part number again and I'll go back into the dusty part of the library and see if I can find an old data sheet. I can then tell you how to cobble a replacement part in. Jim "three-eight-hotel" wrote in message ups.com... I think "relay" is the correct terminology for this component. I thought they were referred to as "relay switches", but all sites I have seen do refer to them as "relays". |
#22
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Avionics (Radio Problem) Narrowed Down... I Think???
We routinely use relays in audio panels for the simple reason that the mic
audio is a rather finicky beast that requires metal switching to perform reliably. Trying to do it solid-state is a recipe for failure. Jim "TaxSrv" wrote in message ... "RST Engineering" wrote: What is a relay switch? I've never seen one. I've seen relays. I've seen switches. I've never seen a relay switch. A quick Google shows the R40-etc. is a discontinued relay. It would seem like a Rube Goldberg setup for a simple audio switching panel. Unless it fancily switches comm 1/2 with simple pushbuttons and indicator lights. Thence a latching relay, or more Rube Goldbergian, with a monostable and a flip-flop? But if it has a BOTH feature, then how we do that? :-) Reg, Fred F. |
#23
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Avionics (Radio Problem) Narrowed Down... I Think???
I can tell you how to replace it with a genuine Radio Shack part if you wish
That would be awesome, if for nothing else a backup if this thing starts to mis-behave again. Since fiddling with the relay at the restaurant it hasn't yet failed, but that was only 25 minutes of flying, post fiddle... Give me the manufacturer and part number again and I'll go back into the dusty part of the library and see if I can find an old data sheet. I can then tell you how to cobble a replacement part in. I'm going up tomorrow and will post everything I can find... AMF Potter Brumfield R40-E1-X4 was the only thing I can recall seeing, but I'll take a look again. Definitely no manufacturer name on the audio panel itself??? Thanks! Todd |
#24
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Avionics (Radio Problem) Narrowed Down... I Think???
The info off the relay says:
AMF Potter & Brumfield R40-E1-X4-V200 12VDC 7705 Thanks! Todd |
#25
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Avionics (Radio Problem) Narrowed Down... I Think???
And I can't find my old P&B catalog to save my soul. It may have been a
victim of one of my "haven't used it in twenty years, throw it out" library purgings of last year. Best I can find is that it is a 3 pole, double throw relay. That sort of gobs up the works, but we can still find a replacement if you will tell me how it connects into the panel. Is it a plug in? Bolt down? Can you take a picture of it and post it somewhere? We can cobble anything if we know the form factor, even if it means three SPDT micro relays in the same space. Jim "three-eight-hotel" wrote in message oups.com... The info off the relay says: AMF Potter & Brumfield R40-E1-X4-V200 12VDC 7705 Thanks! Todd |
#26
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Avionics (Radio Problem) Narrowed Down... I Think???
Thanks for looking Jim!
I found a link for someone that sells components and requested to have a relay shipped to me. I'll probably put that one in and keep the other one for a backup, although I'd be surprised if this is a common problem given the number of Cessna audio panels that are out there and still working... I am probably going to try and find another audio panel, with marker beacons and the componentry to support another COM, so I can throw one in some day. I'd love to bite the bullet and upgrade to a newer audio panel, but that would require a rewire and would be quite expensive! What I have in there now serves my purpose, when it all works!!! ;-) Thanks again for all of the input! I will post an update on how things go, once I've had a chance to replace the relay. As for the immediate problem... it has not come back, since we fiddled with the current relay, although, I've only got about 3 hours of flight time since. None-the-less, I wasn't getting that much functionality out of it, when it was intermittently working! Best Regards, Todd |
#27
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Avionics (Radio Problem) Narrowed Down... I Think???
Received a new relay on Wednesday, plugged it into the audio panel and
slid the audio panel back into the stack this morning. Took off out of Georgetown, after making my radio calls (with sidetone on every call), turned downwind, and set the trim for a 300 fpm climb, while I started tuning in frequencies. First SAC ATIS.... Loud and Clear. Second NorCal approach... Loud and Clear. Back to GT freq 123.05 and heard numerous calls at Marysville and Cameron Park. As I continued to climb, through 7000 feet, I considered turning right 45 degrees and heading over Lake Tahoe as the winds were calm and the weather was gorgeous. As I prepared to turn, I noticed Nevada Co. airport and Grass Valley off to my immediate left. Tuned into the local frequency, let them know my position and asked for a radio check.... LOUD AND CLEAR! Waved hello to Jim (probably didn't see me), and decided I would head back home and get some chores done, even though I could have flown all day! Did I mention it was gorgeous out there? Thanks for everyone's patience and help over the last few months! I'm so glad to think this nightmare could finally be behind me, and am ready to head up and get that instrument currency, now that I can communicate!!! I just hit 6 months without my approaches a few weeks back, so I'll have to go up with a friend and get some hood work done. After that, I'm looking for some of that Valley fog, as I'm ready for some actual!!! Best Regards, Todd |
#28
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Avionics (Radio Problem) Narrowed Down... I Think???
On 11/19/2005 4:06 PM, three-eight-hotel wrote:
Received a new relay on Wednesday, plugged it into the audio panel and slid the audio panel back into the stack this morning. Took off out of Georgetown, after making my radio calls (with sidetone on every call), turned downwind, and set the trim for a 300 fpm climb, while I started tuning in frequencies. First SAC ATIS.... Loud and Clear. Second NorCal approach... Loud and Clear. Back to GT freq 123.05 and heard numerous calls at Marysville and Cameron Park. As I continued to climb, through 7000 feet, I considered turning right 45 degrees and heading over Lake Tahoe as the winds were calm and the weather was gorgeous. As I prepared to turn, I noticed Nevada Co. airport and Grass Valley off to my immediate left. Tuned into the local frequency, let them know my position and asked for a radio check.... LOUD AND CLEAR! Waved hello to Jim (probably didn't see me), and decided I would head back home and get some chores done, even though I could have flown all day! Did I mention it was gorgeous out there? Thanks for everyone's patience and help over the last few months! I'm so glad to think this nightmare could finally be behind me, and am ready to head up and get that instrument currency, now that I can communicate!!! I just hit 6 months without my approaches a few weeks back, so I'll have to go up with a friend and get some hood work done. After that, I'm looking for some of that Valley fog, as I'm ready for some actual!!! Best Regards, Todd That's great news. I had a problem with an ANR headset early in my training that almost caused me to stop. Luckily, before I did, I tried out a cheapo pair of non ANR and have never gone back. To this day, I still marvel over how well I can hear each communication. It's amazing how precious it can be once you've had to do without for some time! By the way, do you already have someone lined-up for the instrument practice? -- Mark Hansen, PP-ASEL, Instrument Airplane Sacramento, CA |
#29
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Avionics (Radio Problem) Narrowed Down... I Think???
To this day, I still marvel over how well I can hear each communication.
It's amazing how precious it can be once you've had to do without for some time! No kidding! I've been dying to do some practice IFR flying, but afraid of having to go the handheld and tell ATC that I'm just going to resume own nav back to Georgetown, rather than trying to concentrate on approaches and fuss with a handheld (and not be able to communicate to the guy in the right seat). I sooooo hope this is the end of it, and I can get back to hearing and talking to everyone! By the way, do you already have someone lined-up for the instrument practice? Someone that's always willing, but not necessarily lined up... If you're up for some evening flying, we should get in touch. Best Regards! Todd |
#30
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Avionics (Radio Problem) Narrowed Down... I Think???
On 11/19/2005 5:24 PM, three-eight-hotel wrote:
To this day, I still marvel over how well I can hear each communication. It's amazing how precious it can be once you've had to do without for some time! No kidding! I've been dying to do some practice IFR flying, but afraid of having to go the handheld and tell ATC that I'm just going to resume own nav back to Georgetown, rather than trying to concentrate on approaches and fuss with a handheld (and not be able to communicate to the guy in the right seat). I sooooo hope this is the end of it, and I can get back to hearing and talking to everyone! By the way, do you already have someone lined-up for the instrument practice? Someone that's always willing, but not necessarily lined up... If you're up for some evening flying, we should get in touch. Weekends are better, but I would like to help if you need it. Contact me off-list any time. Best Regards! Todd -- Mark Hansen, PP-ASEL, Instrument Airplane Sacramento, CA |
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