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Micron PL7d

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gangster28/03/2016 14:41:55
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Hi

i am looking for a set of plans and instructions for the later red pl7d. The one with the adjustment holes in the side cheeks

anyoe able to mail me a PDF etc please

G194028/03/2016 14:54:04
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I built a Micron transmitter when I first started getting interested in aeromodelling but I gave it away together with the documentation some years ago. I converted it to 40Mhz to use for model yachting IIRC. However I still have circuits and documentation for Micron receivers and you're welcome to them if they're of any use.

Geoff

Percy Verance28/03/2016 16:18:37
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I can't recall a red PL7D, although I had one of the white ones for a while.......

I liked the open gimbal sticks. If you got a good one they worked well.

gangster28/03/2016 16:45:57
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Hi Geoff

Thanks for the offer but I have the documentation for the receivers that I have. Kind of you to offer though.

Percy Yes I believe that the last ones were red, The one I have is red

Yes I built the PL7D when it first came out, it was white and AM of course.

I must admit I went right off the open gimble sticks when the rain got in one evening and I swapped it for a Futaba M

I now have one which I might put on 2.4

Percy Verance28/03/2016 17:02:06
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Hi again Gangster

My PL7D was one of the early 35mhz FM versions. Built by the local Micron agent from a neighbouring club. Served me well for a couple of years.

Never had an M series, but did go for the later Gold one. Good solid set from the days when Futaba was king........ When I began flying radio, almost everyone had switched to Futaba Digimax, complete with their six sets of supplied crystals..... 

What a contrast to these days. Fut certainly knew to win customers back then.

Edited By Percy Verance on 28/03/2016 17:06:46

gangster29/03/2016 08:29:20
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Yes that M series was good. I did not keep it long as FM came along which was a big step forward so I part exchanged it for Skyleader FM

Percy Verance29/03/2016 13:57:45
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Also Skyleader here too Gangster, a Courier 7 back in the very early 80's. Good set, did me well. The absolute pinnacle of luxury too, with an integral mixer and two adjustable rate pots.

Bob Cotsford29/03/2016 14:17:27
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Was this the version also published as a DIY article in one of the mags? If so I may still have the articles somewhere, I'll see if I can dig them out.

Percy Verance29/03/2016 15:49:37
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I don't remember any Micron offerings in the mags as such Bob, but I do remember someone doing a review on a DIY Micron 35mhz receiver kit many moons ago.....

gangster29/03/2016 15:52:53
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That's interesting Bob it vaguely rings a bell

I already have the kind offer of a plan which I have accepted but I will bear this in mind as I think there were variations. I believe mine was a late one with rates and possibly mixers so would certainly be grateful for any info on those facilities. Cheers

Robin Colbourne31/03/2016 23:34:42
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From what I remember, Micron products were generally in white moulded cases, although this red one turned up in a search:

**LINK**

The RCM&E transmitter whci hwas built from a kit about the same period has a red plastic coated aluminium case with black plastic ends. The bottom of the case was a continuous curve from front to back, and the case tapered in towards the top.

PatMc01/04/2016 01:00:51
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Posted by gangster on 28/03/2016 14:41:55:

Hi

i am looking for a set of plans and instructions for the later red pl7d. The one with the adjustment holes in the side cheeks

anyoe able to mail me a PDF etc please

Is it the RM Digicon, circa 1986 ?
If so I have the original free plan style mag centre spread in my hands. Also have photo copies of the follow up articles from Jan to May '86.

Give me a shout if it's what you want.

Pat.

gangster01/04/2016 06:50:55
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Robin and Pat. Thanks for your interest guys.

Robin

Yes that is very similar to mine with the six proportional channels on the red moulded front panel. The differences from what I can see from that photo is that the black aluminium part does not have an additional proportional channel but does have a very large Micron PL7D 35Mhz label. and a very large 35Mhz label as well.

The power LEDs are the same and there are two swithches on the top panel ,one three position.

Like you and others have said we generally remember Micron as black and white right from the single channel ones,

I know the RCM&E very well as I still have the one that I built in 1979 I built the full version with all the bells and whistles, well ahead of anything you could buy I would still fly it now but the sticks are worn out, although I believe SLM still make them. Mive was actually in that same tapered curved case but not the red vynyl covered one but a plain aluminium one, very smart, I cannot remeber the company that supplied it.

Pat thanks for the offer and I would be interested if the RM digicon is the same, surprisingly I never followed that article, I think it was due to the fact that with family commitments I stopped taking RM and RCM&E every month.

What I have is very similar to the one in Robins link with the differences described above

The rate switches have little pots biult into the assembly and there is a hole in the end cheek to reach this In addition there are three pots on the pcb assemblies around the sticks on each side each of these,total 6 has a corresponding hole in the end cheek , these are proper origional holes properly moulded. I have no idea what the pots do, I assume epa for the six channels, I have not experimented as once I got the thing to work I ripped out the power wiring,battery and the switch due to the worst case of black wire corrossion I have ever seen. It has been left like that since January due to other projects etc, The encoder board have plugs for all the channels ,reversing? Very complex screening and decoupling on the encoder ic, must have been the result of nightmare breakthrough during development.

If the RM digicon has a similar arrangements of the pots etc then yes please I would be very interested to see the plans,either scanned PDF or copies and would be keen to make some sort af arrangement with you to cover costs involved

Thanks Guys

regards Gordon

Bob Cotsford01/04/2016 10:28:38
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8248 forum posts
454 photos

The RM Digicon was the one I was thinking of, there was an add-on board that plugged onto teh mainboard to add rates and delta mixer. I think mine went in a clear out a couple of years ago. I built the RCM&E one too, that was a more complex beast using basic logic chips to build the encoder, and a shift register decoder. The case was cut from old vinyl finish desk units in our toolroom as one of the toolmakers was into RC. My endplates were carved from walnut and lacquered, so the TX really was a nice piece of furniture.

Back to the RM TX - when I returned to RC back in the early 90s I think it was Geoff Sleath that kindly supplied me with his old Micron set to resurrect my RM Digicon.

Bob Cotsford01/04/2016 11:33:07
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8248 forum posts
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I've just been through my old plans and I can't see the Digicon write up or pull-outs, sorry. Another victim of the purges...

gangster01/04/2016 15:11:39
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996 forum posts
17 photos

Bob I just love the idea of the walnut end cheeks. Got this urge now to build a wooden transmitter and varnish it to match my Dawn Flyer

Bob Cotsford01/04/2016 16:14:36
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8248 forum posts
454 photos

Bet that would feel nice in the hand too. One of Phil G's encoders, a suitable 2.4 module - and set of Queen Anne feet? Next up, a slate veneered tx for the Flinstone look?

PatMc01/04/2016 21:17:30
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4321 forum posts
524 photos

Gordon, I've had a quick look at all photo copied parts, AFAICS - pt 1 is the Tx assembly instructions; pt 2 covers construction of a couple of Rxs; pts 3 & 4 cover channel mixing; pt 5 is a simple wall wart charger construction.

If you PM me your address & say which parts you'd like I'll get them plus the centre spread posted to you. I'm guessing that you won't want Pts 2 & 5.

Pat.

GONZO01/04/2016 21:28:19
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1353 forum posts
14 photos

Does this Tx uses the Signetics NE5044 encoder chip(discontinued)? If so and you intend to use with FrSky module they can be susceptable to noise on the power lines giving problems with the pulse width stability.

gangster02/04/2016 08:26:41
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996 forum posts
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Gonzo Now that is interesting information Maybe explains why there is an earth sheild bent right over the top of the NE5044 to which is soldered the earth side of 7 capacitors all going to the pins on one side.

Is there an easy answer such as heavy decoupling on the power line or is 2.4 Ghz conversion best left alone on this

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