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Saturday 7/7/18

2018-07-07, 21:07 by Gary M Jones

I was at the field today between 14:00 & 15:00 all on my own , good flying too. There is a dead sheep along the fence line towards the gate from the pits, I saw the farmer so reported this to her. I hope no one had plans for a BBQ Smile .

Farmer …

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receiver modulation

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receiver modulation Empty receiver modulation

Post by Guest on 2010-06-08, 20:38

Ive a NER-549X 35 MHz no details on the front anybody know offhand what the modulation is ? Very Happy

reason for asking I do not seem able to get it working,on PPM ,SC,, or Z.... modulation

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receiver modulation Empty Re: receiver modulation

Post by Tim on 2010-06-08, 21:38

Are you sure it has the correct crystal in?

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receiver modulation Empty Re: receiver modulation

Post by PDQ on 2010-06-08, 22:00

NER-549 is an FM receiver single conversion. This version doesn' t do PCM.
here is the manual which also describes the receiver.
http://www.macgregor.co.uk/support/radio/XP3810-1.pdf

Receiver will work with any Futaba or JR crystal
best to use JR, it fits better with it's crystal holder.

If you use a JR Tx you MUST fit a JR crystal in the Tx
If you use a JR Tx crystal in any other make of Tx. That Tx won't work correctly.
(The JR Tx RF section crystals are cut differently. A peculiarity of all JR gear)

Obviously, you must use matching frequencies in Tx and Rx.
And of course you should use your club allocated 35 MHz frequency

(A mine of useless information from the past !)
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receiver modulation Empty Re: receiver modulation

Post by Brian Colclough on 2010-06-08, 22:15

RDMFC has never allocated frequencies Paul Idea

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receiver modulation Empty Re: receiver modulation

Post by Tim on 2010-06-08, 22:38

I was thinking more about single /dual conversion crystal selection

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receiver modulation Empty Re: receiver modulation

Post by PDQ on 2010-06-09, 07:02

Brian Colclough wrote:RDMFC has never allocated frequencies Paul Idea

Strange that Brian. When I joined in 2004/5, I was allocated "64". and there were 3 others sharing that channel.
Obviously, many have gone 100% to 2.4G. So maybe no need to assign 35 MHz frequencies.
Perhaps the Committee can advise please what the real situation is now.
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receiver modulation Empty Re: receiver modulation

Post by Guest on 2010-06-09, 07:42

thanks guys for your comments.Appreciate it.


PDQ wrote
And of course you should use your club allocated 35 MHz frequency

Dont understand how the committee can comunicate with my Tx telling it which frequency Im on Twisted Evil

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receiver modulation Empty Re: receiver modulation

Post by Rich on 2010-06-09, 08:09

We did allocate several years ago, because if you bought a transmitter from a loca source they tended to give out the same channel, as far as I can remember this has now ceased, if you could check the club code of conduct (rules) I don't think it's in there from memory

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receiver modulation Empty Re: receiver modulation

Post by Guest on 2010-06-09, 08:34

noticed that the Tx frequency when not in ppm/pcm/s,z mode is 53/72 MHz.The Rx is 35 MHz

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receiver modulation Empty Re: receiver modulation

Post by Brian Colclough on 2010-06-09, 08:46

To my recollection the committee produced a list of who was on what so that a new member could make an informed choice as to what crystals to buy/select (ie least used frequencies). When I hear a club allocates frequencies I take it to mean they allocate you that frequency and that is the one you "must" fly on at their field. Suspect Sorry John this is not helping with your problem Embarassed

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receiver modulation Empty Re: receiver modulation

Post by PDQ on 2010-06-09, 09:29

Brian
In 2005, I was told, once allocated, I must always use 64, so I did.
Glad your knowledge of past club procedure highlighted the issue for me.
thank you.

John
53/72 MHz ???
Check your Tx plug in module (back of set)
Sounds like you have a "Made for USA" version in your set
The UK version will say 35 MHz
You may need to get one of these from an old set
PPM, PCM 'S', or 'Z' signals are created within the JR transmitter. This information is then sent out through the plug in transmitter module on 35 ,53 , 72 MHz, depending on which module you fit.

Allocated frequencies
The club used to check the 35 meg transmitters each AGM for channel frequency really transmitted. Not happened for a year or two.


Last edited by PDQ on 2010-06-09, 09:36; edited 1 time in total (Reason for editing : more info)
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receiver modulation Empty Re: receiver modulation

Post by Brian Colclough on 2010-06-09, 09:49

During my time at the club no one has ever told me what frequency I must fly on (perhaps RT tried and failed) and I've never heard of this from anyone else. When on 35Mhz I used mainly 68 but changed crystals on many occasions for different events at the field. I think not 100% certain Colin Little is the man with the equipment if you wish to get your 35Mhz trannie checked, I'm sure a committee member will confirm or otherwise pirat

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receiver modulation Empty Re: receiver modulation

Post by melfyn on 2010-06-09, 11:22

I now have the TX frequency checkers for 35Mhz in my posession, however as moast members are now on 2.4Ghz the need to use them will eventually cease. If any member needs a 35Mhz TX checking I will bring said equipment to the field the next time I go flying.
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receiver modulation Empty Re: receiver modulation

Post by Guest on 2010-06-09, 13:35

anybody want to buy a 35 mhz Rx perfect working order with the right Tx

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receiver modulation Empty Re: receiver modulation

Post by PDQ on 2010-06-09, 16:34

johnoxleydean wrote:anybody want to buy a 35 mhz Rx perfect working order with the right Tx
How much?
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receiver modulation Empty Re: receiver modulation

Post by Sam Thomas on 2010-06-09, 16:51

im 100% 2.4ghz But I do have some 35meg stuff lying around from john
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receiver modulation Empty Re: receiver modulation

Post by Guest on 2010-06-09, 17:14

Im slowly going over to 2.4We have a 6i @2.4 and the JR 35 meg

Paul if you really want it its yours no charge hate to rob a pensioner

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Post by PDQ on 2010-06-09, 18:00

johnoxleydean wrote:Im slowly going over to 2.4We have a 6i @2.4 and the JR 35 meg

Paul if you really want it its yours no charge hate to rob a pensioner
What do you mean pensioner ! You're young as me. Anyway, thank you, yes please. I can give you in return some Vapor Lipo's and some other indoor bits.
I still have all my 35 meg gear and it still works OK. I suppose they are antiques but so am I.
I did invest in a DX7 with 2 receivers and a DM9 module to suit one of the JR3810 tranies.

The DX7 Tx disapointed me in that it it didn't do :-
Easily unplug the battery for external charging
Glider mode
Copying program from 1 Tx memory to another Tx or JR backup on PC
Switching between modes. You have to buy it in the mode U need. 1 or 2
Otherwise it seems OK
Maybe we can liaise with PM's about the swap
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receiver modulation Empty Re: receiver modulation

Post by Tim on 2010-06-09, 19:25

Not wishing to divert the thread ( but its answered now really anyway aint it ) but can I ask you a few things about the DX7 remarks Paul.
1) The battery unplugs quite easily actually - and why do you want to anyway? I charge mine in situ ( even Lipo ) attended at 1.5A
2) Mine does all of my ( albeit fairly simple ) gliders fine. With 2 fixed and 6 free mixes almost anything can be donewith some fiddling.
3) Agreed...but seldom really needed surely?
4) No big deal, I dont intend switching modes so whats the problem?

Not being a smartarse, just curious receiver modulation Icon_surprised

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receiver modulation Empty Re: receiver modulation

Post by Sam Thomas on 2010-06-09, 19:49

Dont you usualy buy the mode you want anyways...?
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receiver modulation Empty Re: receiver modulation

Post by PDQ on 2010-06-09, 21:48

Sam Thomas wrote:Dont you usualy buy the mode you want anyways...?

Well, in the past "NO".
The DX7 is the first outfit I ever bought where I had to specify I wanted mode 2.
My JR sets were available in 4 modes but McGregor Industries UK only imported mode 2. (easily altered by customer). My Graupner MC20 and Simprop 2000 can also be set to any mode.

Yes, the argument about which mode is best was going on 35 years ago.
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receiver modulation Empty Re: receiver modulation

Post by Sam Thomas on 2010-06-09, 22:19

But I cant see why you would want to buy a mode 1 (for arguments sake) and then convert it to mode 2? Question
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receiver modulation Empty Re: receiver modulation

Post by PDQ on 2010-06-10, 00:19

Both my JR3810's came as mode 1 from my flying pal, Alan, in Cheshire. He wanted to sell them quick to finance buying the new digital trim version. He's mode 1 and I'm mode 2. Both sets were less than 3 months old.
The quick mode change solved both our problems. He got his new sets and I got a good deal. Some model shops do not have vast funds to stock everything. e.g. The set in stock won't sell because it's the wrong mode. This is cash tied up. If the set could be easily changed over, then it would go more easily.
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receiver modulation Empty Re: receiver modulation

Post by Sam Thomas on 2010-06-10, 16:21

Ahh Ok I see, but still its a bit 'picky' to slag off the dx7 because you cant swap modes!!!
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receiver modulation Empty Re: receiver modulation

Post by Brian Colclough on 2010-06-10, 16:53

Why not it's a shortcoming surely Suspect

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