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Old 35mHz Futaba

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Mel Jones18/10/2019 14:42:31
61 forum posts

I have a 35mHz Futaba T7CP transmitter and a number of receivers and crystals, which I no longer use.

I would like to give them to a school or college as the kit is in good condition it seems a pity to bin it.

Does anyone know of a likely place that could use this kit?

kevin b18/10/2019 18:17:06
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1670 forum posts
134 photos

A lot of us are keeping our 35mhz kit.

Just i case !

Doc Marten18/10/2019 18:42:32
378 forum posts
4 photos

I still use 35meg.

Dave Cunnington18/10/2019 19:03:50
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114 forum posts
56 photos

Hi Mel, as Doc M above, I too use all 35meg stuff

Should you be interested , please pm me with details of a suitable exchange rate

in coin of the realm

Rgds DC

Tom Sharp 218/10/2019 19:50:18
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3554 forum posts
18 photos

A school or college would not want to use old technology, elf and safety.

Malcolm Fisher18/10/2019 19:55:57
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619 forum posts
7 photos

I can't see why a school or college wouldn't want to use 35MHz equipment. After all it is the ONLY frequency dedicated to model aircraft. I still use some as well as some even older 27 MHz gear with no problems even though I do have some 2.4 Gig radios - also, to date, with no problems.

Malcolm

Phil Green20/10/2019 15:47:38
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1530 forum posts
309 photos

Personally I think everyone ought to keep at least one 35mhz set, use it or lose it!

Wingman20/10/2019 16:01:17
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1105 forum posts
405 photos

Ah yes I can see it now - latest government ammendment to Drone regulations 3.2.3.1.2.3.12.23 para 3.2 sub para b (1) "Model aircraft controlled exclusively using frequencies in the 35Mhz dedicated model flying band will be exempt from all regulations herein"

wink wink

Mowerman20/10/2019 16:37:40
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1542 forum posts
105 photos

Yes keep some 35Mhz and use it occasionally like I did then forget to extend the Tx aerial, oops, crunch, never mind it was an old 'hangar queen'.

Don Fry20/10/2019 17:35:08
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4055 forum posts
47 photos

We've all dun it.

edit, right handed culprits turn anti-clockwise in frustration. Cack handers, opposite. You look next time.

Edited By Don Fry on 20/10/2019 17:37:07

Edited By Don Fry on 20/10/2019 17:37:57

Peter Miller20/10/2019 18:35:02
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10265 forum posts
1226 photos
10 articles

I still have my beloved FF8 and a stack of recievers.

Martin McIntosh20/10/2019 20:41:34
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2954 forum posts
1086 photos

I gave away my almost new and expensive 35mHz Rx`s for use by some youngsters because 2.4 came about just after I bought them, but have kept the JR 3810 tranny since I can use a 2.4 module in it.

Beware though, the lithium back up battery has a limited life and is very difficult, if not impossible, to replace. I tried this on a 388. When it dies you lose all memories and the Tx is effectively dead.

Doc Marten20/10/2019 22:14:48
378 forum posts
4 photos
Posted by Peter Miller on 20/10/2019 18:35:02:

I still have my beloved FF8 and a stack of recievers.

Me too, PCM and dual conversion Rxs and 2 FF8s, one on 35meg, the other on 2.4gig.

Oh, and a FF6 🙂

Edited By Doc Marten on 20/10/2019 22:16:29

Peter Christy20/10/2019 22:36:09
1583 forum posts
Posted by Martin McIntosh on 20/10/2019 20:41:34:
Beware though, the lithium back up battery has a limited life and is very difficult, if not impossible, to replace. I tried this on a 388. When it dies you lose all memories and the Tx is effectively dead.

They're not that difficult to replace. I've just done a 347 for a lad and fitted a 2.4GHz module in it - working fine now.

Sourcing batteries with the solder tags welded on is tricky, but I just soldered some short solid wire leads straight to a standard battery.

OK, it lost all its memories, and I did a recalibration of the sticks as a precaution, but its really not that difficult. It just needs a bit of care and patience. Plenty of guides out there on t'internet!

wink

--

Pete

Martin McIntosh21/10/2019 09:57:34
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2954 forum posts
1086 photos

Can`t speak for the 347, but the 388 has two rows of spring loaded buttons which are a nightmare to refit, also the cell is sandwiched between double decker pcb`s. Tried an ordinary cell wired in parallel but of course it soon discharged.

Geoff Sleath21/10/2019 11:41:23
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3434 forum posts
297 photos

I've still got my 35Mhz Multiplex 3030 transmitter and a few Multiplex/other IPD/DSP receivers. No point selling it as it would fetch very little. I made a Frsky 2.4 gHz DiY module for it so it's even a possible standby if needed.

Geoff

Peter Christy21/10/2019 12:47:47
1583 forum posts

Martin: the 347 is pretty much the same. The trick is to use masking tape or similar, to hold the buttons in place whilst dismantling and replacing.

The PCB is removable, with care - certainly on the 347. (I believe the 388 is similar.)

You can then unsolder the old battery and replace it. If you parallel them up, it will simply discharge the new battery, as you discovered.

Depending on how long the battery has been flat, you may have to do a "system reset". Again, instructions are out there: **LINK**

Not something I want to be doing every 5 minutes, but perfectly do-able. And there's always Mike Ridley! wink

--

Pete

GONZO21/10/2019 13:42:16
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1289 forum posts
14 photos

I confess this is an area I am totally ignorant in. How long do these internal batteries last? I've got a Futaba FF8 that's over 25 years old and no problems yet. A FF9 that's' just under 20 years old and two FF9 super that are almost as old, all with no problems. They've always had a main battery installed and kept charged. You say the internal batteries are 'lithium' (rechargeable type?), do they get charged by the main battery(possibly when the Tx is switched on) and the reason people have had to replace them is because the Tx has been left for some time without the main battery installed/Tx switched on?

GONZO21/10/2019 19:04:29
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1289 forum posts
14 photos

A bit of searching reveals that there is no memory battery in my Futaba Tx.

Martin McIntosh21/10/2019 22:42:52
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2954 forum posts
1086 photos

Thanks Peter. I think that the 347 must be quite different, just look at that reset procedure.

I used to do intricate pcb repairs for a living but on examining the 388 decided that removing all those interboard wire links was not on. Anyway, I had sold it to a mate who probably never switched it on since he just likes having

old radios. I too used tape on the buttons but those springs were a devil.

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