Old School Radios, giving another life into it.

Brushed, nicad, radios, etc...

Moderators: scr8p, klavy69

slow_jun
Approved Member
Posts: 958
Joined: Mon Oct 05, 2009 10:59 am
Location: Manila/Singapore
Been thanked: 2 times

Old School Radios, giving another life into it.

Post by slow_jun »

Guys and Gels,

i know that this is old news but just want to share.

over the past 3 weeks, i've been googling on how to convert my Old KO- EX-II to 2.4 GHZ, and manage to give it a yank last night when my FRsky 2.4GHZ DIY kit arrive from Hobby King (Hong Kong service was Bad), so below are some pics on how to hack your Old Ko -EXII (Same IC used by EX- 5 ) using the Oki chip pin 9.

You will be needing the parts below;

FRsky 2.4 DIY kit. $15.80/pc.
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=14353

Some 2.4Ghz RX (pretty small and light). bought 2 pcs for $14.74 /pc.

http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=14352

Locate your TX PPM signal , for KO (Oki chip L9362).

Schematic Diagram of the chip.

Image

EX- II PPM signal pin ( Pin 9)

Image

Image

EX- 5 PPM signal pin ( Pin 9)

Image

I converted first my EX- II and tapped from the IC's Pin 9 before the Resistor. PPM signal would be on the right with the diode attached to it, the right would be the negative (-)

Image

Image

I tapped the Positive (+) power source directly after the on-off switch, when i tried using the source coming from the board, it did not worked, i think the power is not sufficient enough to power the module ( it does says that operating voltage is 6V-13V :? ).

Image

All wires are in place.

Image

Binding button in place.

Image

Finish product.

Image

Image

Haven't tried to check the range yet but will do once i get the time. Over all, binding was fast, i think much faster than my M11 RX 441 rx ;-( , but still need to thorough test it.

Over all its a cheap way to re-use your old TX and give it another life. :lol: , as compared to the Corona Hack (based from some feedback) the Corona module DIY has problems on the overheating of the DIY due to the chip PPM signal cannot handle voltage above 3V whick FRsky solved by putting a Diode to filter voltage above 3V, and FRsky (claimed) that the ACCST is much faster (some reviews proves it , RCmodelreviews via youtube), than other 2.4 GHZ (Corono, Assan in particular).

This only shows how to do it and will not guarantee that it will work for all hacks, users are advise that risks is involved and potential equipment damage may occur if installation is not correct.

I encourage all potential "Hackers" to do first their homework prior performing this trick so that no regrets in the end, there are some reported issues like servo jitters (mine was very minimal but tolerable) and some does not have any, so one should take these into consideration before doing and buying these DIY. I try to be as honest as possible and share all the details on how to do this Hack and will try to help as much as i can. so lets enjoy again our old school radios and race!!!!!!

cheers!!!

jun.
“It is more shameful to distrust our friends than to be deceived by them.”
― Confucius

tamiyadan
Approved Member
Posts: 1690
Joined: Wed Apr 07, 2010 4:45 pm
Been thanked: 6 times

Re: Old School Radios, giving another life into it.

Post by tamiyadan »

.

slow_jun
Approved Member
Posts: 958
Joined: Mon Oct 05, 2009 10:59 am
Location: Manila/Singapore
Been thanked: 2 times

Re: Old School Radios, giving another life into it.

Post by slow_jun »

Sorry dont have a fet servo,had one before.

Some analog servo are not affected by the servo chatter,but what brand and make im not sure,there Are some thread at rcgroups and rcmodel reviews that identifies which was tackled. But the chatter are not experienced by some, and there was a fix whch addressed this issue. Anyway a good research is always helpfull before hacking your precious vintage radios. :-)
“It is more shameful to distrust our friends than to be deceived by them.”
― Confucius

User avatar
aeiou
Approved Member
Posts: 1071
Joined: Fri Apr 13, 2007 4:04 pm
Location: Atlanta, GA
Been thanked: 1 time

Re: Old School Radios, giving another life into it.

Post by aeiou »

Interesting write up. It looks like a fun project - kind of reminds me of my Heathkit/Radio Shack projects from years ago. I might have to try this with my old XL2P to go along with the old-new theme. I wonder if I find a LiPo pack to fit that'll old radio? :D

tamiyadan
Approved Member
Posts: 1690
Joined: Wed Apr 07, 2010 4:45 pm
Been thanked: 6 times

Re: Old School Radios, giving another life into it.

Post by tamiyadan »

.

User avatar
aeiou
Approved Member
Posts: 1071
Joined: Fri Apr 13, 2007 4:04 pm
Location: Atlanta, GA
Been thanked: 1 time

Re: Old School Radios, giving another life into it.

Post by aeiou »

tamiyadan wrote:just remember the conversion is for the transmitter, you will need to use a new receiver.

if you really want to keep that stock look you can pack a new spectrum receiver into a old futaba or airtronics case.
Yep, the XL2P is a transmitter.

slow_jun
Approved Member
Posts: 958
Joined: Mon Oct 05, 2009 10:59 am
Location: Manila/Singapore
Been thanked: 2 times

Re: Old School Radios, giving another life into it.

Post by slow_jun »

Guys,

im experiencing a little jitter on my servo, you may want on to hold and wait till Hoby king releases the two way telemetry module which other sites says that is solves the servo problem, analog servo is not affected, but tyr your luck.

thanks.
“It is more shameful to distrust our friends than to be deceived by them.”
― Confucius

User avatar
Bormac
Approved Member
Posts: 3112
Joined: Wed Sep 05, 2007 3:52 pm
Location: CENTRAL COAST, NSW AUSTRALIA
Has thanked: 21 times
Been thanked: 3 times

Re: Old School Radios, giving another life into it.

Post by Bormac »

I have a few EX-5 and a single EX-9 radio. I dont mind the AM function but wouldn't mind having a go at setting atleast one up with 2.4g.
-Jason.

Still known as- bormac

My collection-http://www.tamiyaclub.com/showroom.asp?id=10980

User avatar
RC104ever
Approved Member
Posts: 1506
Joined: Sun May 22, 2011 11:34 am
Location: Burlington, Ontario - Canada
Been thanked: 8 times

Re: Old School Radios, giving another life into it.

Post by RC104ever »

Wow I am continually amazed at the things that you guys can come up with on this board. I would never have even dreamed that something like this would be possible. Guess I'm just not that imaginative :lol:
- Chris
Lots of cars...so many cars

slow_jun
Approved Member
Posts: 958
Joined: Mon Oct 05, 2009 10:59 am
Location: Manila/Singapore
Been thanked: 2 times

Re: Old School Radios, giving another life into it.

Post by slow_jun »

Just to update this thread, HK has released the DIY with telemetry that solved the jittering issue. post your Hacks here....

DIY With Telemetry

http://www.hobbyking.com/hobbyking/store/__17205__FrSky_DHT_8ch_DIY_Telemetry_Compatible_Transmitter_Module.html

RX With Telemetry

http://www.hobbyking.com/hobbyking/store/__24788__FrSky_D4R_II_4ch_2_4Ghz_ACCST_Receiver_w_telemetry_.html
“It is more shameful to distrust our friends than to be deceived by them.”
― Confucius

User avatar
knixdad
Approved Member
Posts: 397
Joined: Thu Jun 06, 2013 3:48 pm
Location: Califon, New Jersey
Has thanked: 2 times
Been thanked: 4 times

Re: Old School Radios, giving another life into it.

Post by knixdad »

I have so many Magnum Juniors laying around. Definitely something to mess around with during the snows.
I miss brushed motors in that hazy, everything seemed better when I was a kid, kind of way.

User avatar
JK Racing
Approved Member
Posts: 4599
Joined: Thu Jul 19, 2007 2:32 pm
Location: Placentia, CA
Has thanked: 102 times
Been thanked: 192 times

Re: Old School Radios, giving another life into it.

Post by JK Racing »

slow_jun, are all the OKI L9362 chips the same? My XL2P has the same chip, looks a touch different, but same numbers and its 14 pin as well. I am attempting to use a hack kit, but it wont power up without signal (testing pin 9). I tested it on another radio I hacked, it powered up fine, I checked + & -, we are good and have plenty of juice.
--Joey --
Vintage A&L and Factory Works
Old School Racer & Vintage RC Car nut
JKRacingRC.com

slow_jun
Approved Member
Posts: 958
Joined: Mon Oct 05, 2009 10:59 am
Location: Manila/Singapore
Been thanked: 2 times

Re: Old School Radios, giving another life into it.

Post by slow_jun »

They should be the same if the part number is.make sire your hitting the same pin,pin one should start top left(where the notch is placed) then count downwards then down-top-. If your not able to power it on maybe (just maybe) you did not get the power right.

or...

did you tap your power from the boards? in my previous post, I believe I also encountered that issue, to overcome that one, I directly taped from the + on off switch.

note that operating voltage is from 6V-13V.

or if you need to tap before the resistor ( Signal on Pin 9), for it to work.

let us know the outcome.
“It is more shameful to distrust our friends than to be deceived by them.”
― Confucius

User avatar
JK Racing
Approved Member
Posts: 4599
Joined: Thu Jul 19, 2007 2:32 pm
Location: Placentia, CA
Has thanked: 102 times
Been thanked: 192 times

Re: Old School Radios, giving another life into it.

Post by JK Racing »

After many hours of excruciating research, I found the OrangeRX diy kit is for DSM2/DSMX air, not ground :( I gave up on the XL2P and kept trying to just get the darn thing to bind using my Futaba that has my FrSky diy installed. I will spend today putting that kit back in the Futaba.

What a waste of a Saturday. Not a happy camper. :cry:
--Joey --
Vintage A&L and Factory Works
Old School Racer & Vintage RC Car nut
JKRacingRC.com

User avatar
JK Racing
Approved Member
Posts: 4599
Joined: Thu Jul 19, 2007 2:32 pm
Location: Placentia, CA
Has thanked: 102 times
Been thanked: 192 times

Re: Old School Radios, giving another life into it.

Post by JK Racing »

I get no signal on pin 9, but i do on pin 8. At least my hack kit says I'm getting signal. I can bind the receiver, but nothing works. I pull the hack out, plug in the crystal, everything works fine, put the hack back in, binds up, no movement. I'm stumped. FrSky diy, the orangerx is back in the box for now.
--Joey --
Vintage A&L and Factory Works
Old School Racer & Vintage RC Car nut
JKRacingRC.com

Post Reply

Create an account or sign in to join the discussion

You need to be a member in order to post a reply

Create an account

Not a member? register to join our community
Members can start their own topics & subscribe to topics
It’s free and only takes a minute

Register

Sign in

  • Similar Topics
    Replies
    Views
    Last post
  • Giving something back
    by Synergy » » in Schumacher Forum
    12 Replies
    2101 Views
    Last post by stulec52
  • giving corona to others via RC
    by XLR8 » » in R/C Off-Topic / Chit-Chat
    3 Replies
    1138 Views
    Last post by Biz73
  • Giving up the prize- Throwing out the baby w/ the bathwater
    by MOmo » » in Off-Topic / Chit-Chat
    16 Replies
    2392 Views
    Last post by mrlexan
  • radios
    by Halgar » » in Off-Topic / Chit-Chat
    3 Replies
    272 Views
    Last post by y2kgtp
  • Any Good Radios Out There??
    by trevorda8 » » in Modern Electronics
    20 Replies
    2529 Views
    Last post by Lowgear
  • Kraft radios?
    by Momo5 » » in Off-Topic / Chit-Chat
    1 Replies
    357 Views
    Last post by Jay Dub
  • Stick radios old to new.
    by CAT3K » » in Vintage Electronics
    1 Replies
    952 Views
    Last post by GJW
  • Stick radios
    by Roadblock » » in Modern Electronics
    27 Replies
    1983 Views
    Last post by vintage racer

Return to “Vintage Electronics”

Who is online

Users browsing this forum: No registered users and 15 guests