crystal set question...
06-02-2004, 08:45 PM
#1
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crystal set question...
Hello folks.
I bought a set of crystals on ebay.
One of them marked TX another RX.Is there a difference between them? The simplest thing,i know,would be to try to swap them but i dont wanna take chances to fry something up since i have no idea 'how stuff works'
Please advice if i can use TX crystal in receiver .Then i will have enough crystals for two sets.
Thanks ahead.
I bought a set of crystals on ebay.
One of them marked TX another RX.Is there a difference between them? The simplest thing,i know,would be to try to swap them but i dont wanna take chances to fry something up since i have no idea 'how stuff works'
Please advice if i can use TX crystal in receiver .Then i will have enough crystals for two sets.
Thanks ahead.
06-02-2004, 08:58 PM
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RE: crystal set question...
Tx is for transmitter and Rx is for Receiver. What brand are they and what brand radio did you want to use them in? If I'm not mistaken, you are supposed to send your Transmitter in to have them swapped out; something about fine tuning required for a swap....
06-03-2004, 04:29 AM
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RE: crystal set question...
Both crystals on channel 22.Its dual conversion futaba radio and dual conversion futaba receiver low-band.The whole idea of buying a crystal set was to get a second airplane working the same channel as my first one.Then i wouldn't have to take out and swap receiver everytime i decide to fly a different planes or carry 2 tx with me.
06-03-2004, 06:00 AM
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RE: crystal set question...
Mitty,
The crsytals should also be matched for the brand of radio. Also never by second hand crystals as you just dont know there condition. Could be damaged and only show up in the air!
Cheers.
The crsytals should also be matched for the brand of radio. Also never by second hand crystals as you just dont know there condition. Could be damaged and only show up in the air!
Cheers.
06-03-2004, 08:41 PM
#7
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RE: crystal set question...
You can not legally change a crystal in a transmitter (FCC law), but the receiver crystal is fine to change. You CAN also throw the Tx off frequency by changing the crystal.
It is not illegal in other parts of the world, so Tx crystals ARE accessible.
We all buy crystals for our receivers in order to keep planes on the same channel.
Dennis-
It is not illegal in other parts of the world, so Tx crystals ARE accessible.
We all buy crystals for our receivers in order to keep planes on the same channel.
Dennis-
06-03-2004, 10:11 PM
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RE: crystal set question...
So can i use a TRANSMITTER crystal in Receiver?
To Ed Smith....Yeah i buy most of my stuff off ebay and i build and fly spads because 4 people eat off my paycheck and there's not a whole lot $$ left afterwards(not that there is a whole bunch in a first place lol)It has nothing to do with faith though.I bought my radio off ebay.Bought a few engines.Bought some other stuff.
To Ed Smith....Yeah i buy most of my stuff off ebay and i build and fly spads because 4 people eat off my paycheck and there's not a whole lot $$ left afterwards(not that there is a whole bunch in a first place lol)It has nothing to do with faith though.I bought my radio off ebay.Bought a few engines.Bought some other stuff.
06-04-2004, 03:25 AM
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RE: crystal set question...
Mitty,
The TX crystal is for transmitter ONLY!, the RX crystal is for the reciver ONLY! You can by a RX crystal for a new reciver so all your recivers are on the same channel as your transmitter.
Cheers.
The TX crystal is for transmitter ONLY!, the RX crystal is for the reciver ONLY! You can by a RX crystal for a new reciver so all your recivers are on the same channel as your transmitter.
Cheers.
06-08-2004, 04:32 PM
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RE: crystal set question...
Isn't there a certain number of digits that you are to remain above or below the actual number given on the receiver from Futaba if you can not match the original crystal number exactly.
For example you purchase a Flight Pack with no crystal, but it was on channel RX23.
What crystal # can you use in it. Let's say a #RX38?
I emailed Futaba and of coarse they say because of FCC and safety reasons they can not recommend changing the crystals even in the receiver w/o sending it in for re-calibration or checking of the Tuning.
I am just looking for second opinions.
Thanks
Hootcher
For example you purchase a Flight Pack with no crystal, but it was on channel RX23.
What crystal # can you use in it. Let's say a #RX38?
I emailed Futaba and of coarse they say because of FCC and safety reasons they can not recommend changing the crystals even in the receiver w/o sending it in for re-calibration or checking of the Tuning.
I am just looking for second opinions.
Thanks
Hootcher
06-08-2004, 06:57 PM
#12
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RE: crystal set question...
Futaba makes receivers in Low band (channels 11 to 35) and High band( 36 through 60). As long as you stay with Low or High band you shouldn't have any trouble. But the closer you stay to the original channel, the better off you are.
Dennis-
Dennis-
06-09-2004, 01:37 PM
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RE: crystal set question...
Dennis:
Thanks for confirming what I have beleived for some time. I was sure that it should have been safe to use a #38 in a #23 receiver. We are trying to eliminate all possibilities related to our recent crash.
We lost all controls at once. We did another range check after recovering the plane, yes the elevator was still working fine and the batts were at full charge.
This was the second flight on a new LT40 with a 61. Our concern is that this is the 4th plane that has had the same or similar loss of signal in the same general area of where we fly, yet not everyone has had problems. We fly at our local airport and the area that this seems to happen is just past a grove of trees and the edge of a farm field. There are no power lines in the area either.
There is a signal tower (radio dispatch?) but it is located at the oppisite end and off to our right. The DEAD ZONE is almost straight across from the center of our runway maybe 2 blocks away.
With out some kind of signal tester we are at our witts end and afraid we will have to choose another field to fly at.
Thanks Again for you advice and lending an Ear
Hootcher
Thanks for confirming what I have beleived for some time. I was sure that it should have been safe to use a #38 in a #23 receiver. We are trying to eliminate all possibilities related to our recent crash.
We lost all controls at once. We did another range check after recovering the plane, yes the elevator was still working fine and the batts were at full charge.
This was the second flight on a new LT40 with a 61. Our concern is that this is the 4th plane that has had the same or similar loss of signal in the same general area of where we fly, yet not everyone has had problems. We fly at our local airport and the area that this seems to happen is just past a grove of trees and the edge of a farm field. There are no power lines in the area either.
There is a signal tower (radio dispatch?) but it is located at the oppisite end and off to our right. The DEAD ZONE is almost straight across from the center of our runway maybe 2 blocks away.
With out some kind of signal tester we are at our witts end and afraid we will have to choose another field to fly at.
Thanks Again for you advice and lending an Ear
Hootcher
06-09-2004, 01:38 PM
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RE: crystal set question...
Dennis:
Thanks for confirming what I have beleived for some time. I was sure that it should have been safe to use a #38 in a #23 receiver. We are trying to eliminate all possibilities related to our recent crash.
We lost all controls at once. We did another range check after recovering the plane, yes the elevator was still working fine and the batts were at full charge.
This was the second flight on a new LT40 with a 61. Our concern is that this is the 4th plane that has had the same or similar loss of signal in the same general area of where we fly, yet not everyone has had problems. We fly at our local airport and the area that this seems to happen is just past a grove of trees and the edge of a farm field. There are no power lines in the area either.
There is a signal tower (radio dispatch?) but it is located at the oppisite end and off to our right. The DEAD ZONE is almost straight across from the center of our runway maybe 2 blocks away.
With out some kind of signal tester we are at our witts end and afraid we will have to choose another field to fly at.
Thanks Again for you advice and lending an Ear
Hootcher
Thanks for confirming what I have beleived for some time. I was sure that it should have been safe to use a #38 in a #23 receiver. We are trying to eliminate all possibilities related to our recent crash.
We lost all controls at once. We did another range check after recovering the plane, yes the elevator was still working fine and the batts were at full charge.
This was the second flight on a new LT40 with a 61. Our concern is that this is the 4th plane that has had the same or similar loss of signal in the same general area of where we fly, yet not everyone has had problems. We fly at our local airport and the area that this seems to happen is just past a grove of trees and the edge of a farm field. There are no power lines in the area either.
There is a signal tower (radio dispatch?) but it is located at the oppisite end and off to our right. The DEAD ZONE is almost straight across from the center of our runway maybe 2 blocks away.
With out some kind of signal tester we are at our witts end and afraid we will have to choose another field to fly at.
Thanks Again for you advice and lending an Ear
Hootcher
06-23-2004, 10:19 AM
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RE: crystal set question...
hi mitty
you cannot legally change the crystal in your transmitter, on most the rf unit is sealed and this seal should never be broken by the user. only by a service facility. the receiver crystals however can be changed, some units have freq range requirements.
hitec receivers can be changed across full range of channels, futaba has hi and lo units which I think change at channel 35. below 35 is lo and above 35 is hi. best bet is hitec, I am using these and very happy with them and service if needed is superb. and they are futaba compatible.
happy flying
pt19 flyer
you cannot legally change the crystal in your transmitter, on most the rf unit is sealed and this seal should never be broken by the user. only by a service facility. the receiver crystals however can be changed, some units have freq range requirements.
hitec receivers can be changed across full range of channels, futaba has hi and lo units which I think change at channel 35. below 35 is lo and above 35 is hi. best bet is hitec, I am using these and very happy with them and service if needed is superb. and they are futaba compatible.
happy flying
pt19 flyer
06-23-2004, 10:34 AM
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RE: crystal set question...
ORIGINAL: Hootcher
Dennis:
Thanks for confirming what I have beleived for some time. I was sure that it should have been safe to use a #38 in a #23 receiver. We are trying to eliminate all possibilities related to our recent crash.
We lost all controls at once. We did another range check after recovering the plane, yes the elevator was still working fine and the batts were at full charge.
This was the second flight on a new LT40 with a 61. Our concern is that this is the 4th plane that has had the same or similar loss of signal in the same general area of where we fly, yet not everyone has had problems. We fly at our local airport and the area that this seems to happen is just past a grove of trees and the edge of a farm field. There are no power lines in the area either.
There is a signal tower (radio dispatch?) but it is located at the oppisite end and off to our right. The DEAD ZONE is almost straight across from the center of our runway maybe 2 blocks away.
With out some kind of signal tester we are at our witts end and afraid we will have to choose another field to fly at.
Thanks Again for you advice and lending an Ear
Hootcher
Dennis:
Thanks for confirming what I have beleived for some time. I was sure that it should have been safe to use a #38 in a #23 receiver. We are trying to eliminate all possibilities related to our recent crash.
We lost all controls at once. We did another range check after recovering the plane, yes the elevator was still working fine and the batts were at full charge.
This was the second flight on a new LT40 with a 61. Our concern is that this is the 4th plane that has had the same or similar loss of signal in the same general area of where we fly, yet not everyone has had problems. We fly at our local airport and the area that this seems to happen is just past a grove of trees and the edge of a farm field. There are no power lines in the area either.
There is a signal tower (radio dispatch?) but it is located at the oppisite end and off to our right. The DEAD ZONE is almost straight across from the center of our runway maybe 2 blocks away.
With out some kind of signal tester we are at our witts end and afraid we will have to choose another field to fly at.
Thanks Again for you advice and lending an Ear
Hootcher
06-23-2004, 02:41 PM
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RE: crystal set question...
Do a little looking, too, for pager towers or industrial users. We share frequencies with those guys and they have a lot more transmitted power. Get with your AMA region VP and try the scanner. It could be that you have a frequency or two that shouldn't be used at your field. It's not too unusual.
