Since Sai has left it to me to provide you with the details of the performance of the Assan Hack 8XD with Assan receivers for 2.4ghz:


a. 8ch RX were tried on two planes: Easycub and Multiplex Fox(20" glider modified with a 2204/14 attached, elevators and rudder)

Easycub:
b. The rx was inside the canopy with the antennae (2 wires) taped on either sides of the fuse, with one wire taped perpendicular to the other. The capacitor was also plugged in, in an empty socket. This cap is required, I believe, to filter any dips in the power supply at start of the servo actuator motors. In the case of the 72Mhz operation, the servo hum may be cured by a capacitor, but we never tried that earlier.. I think Sai we should try this and see if this reduces servo hum in the Mhz rxs.

c. In its 72mhz avatar, it had lot of servo hum. With the 2.4ghz it never showed servo hum with the 8XD hack.

d. Tried range on the ground to about 200 yards ... nary a glitch... perfect smooth and fast control

d. Next took up the Easycub to almost a small cross in the sky... couldnt make out attitude of the model at that height. very smooth control... fast response and very easy to operate... seemingly better control with quicker response.

Multiplex Fox (converted from glider to RC with 2204/14 motor, elevator and ailerons):

a. Had a smaller Assan 2.4Ghz receiver taped outside the canopy. This receiver had only one short (2cm) antenna with 6 channels. There was no capacitor in this case.

b. The plane was very fast and responded very well at high altitude. No instance of any loss of control. The plane was flown even at very high altitude (almost to a dot)

c. In the last flight, (after several very successful sorties), the plane suffered a crash head-on on its motor and the front part of the fuse alongwith the motor and mount ripped off. Still the receiver didnot have any issue and the servos were happily responding. This crash was because of mismanagement of the model by the flyer (myself... am really mortified by my mistake)

So on the whole we felt that the Assan 8XD hacks are very good ... perhaps better than the original Transy.

All the model memories remained in the transy and the change from 72Mhz to 2.4Ghz is acheived via a switch. During all this we never ever hand a loss of binding of the rx with the transy.

Also never observed any rise in temperature of the rx at any time.

So, folks I think this is the way to go if we are considering 2.4Ghz. In fact, if one is to believe what is happening in rcgroups, a lot of people owning original standard 2.4ghz equipment from Futaba, JR, Airtronics etc. are all queuing up to convert to the Assan 8XD hack because it is so much cheaper and is quite as reliable... There are documented cases of people owning more than ten models with one transmitter with conversion to Assan hack



I leave it to Sai to fill in with photos and other details.


Saju

Quote from: rcforall on August 10, 2009, 09:47:45 AM
With no changes to the set up except  the addition of the capacitor and the 2.4 G receiver  how come the " Humming " stopped
Sai

It is a general observation, which may or may not apply in this case. In many cases, just giggling the servo arm or linkage rod fixes the humming (temporarily), if that is the case, we can be pretty sure that it is a mechanical issue.

  great stuff..i thought the rx being inside the canopy would result in some glitches at high altitude but with your report mr.saju everything seems to be going gr8..

The rx has a remote receiver as well ? 200 yds is pretty nice, so its not a full range receiver ??

Looking for some pics..

Cheers

Atul G.

Quote from: atul_pg on August 10, 2009, 11:20:25 AM
The rx has a remote receiver as well ? 200 yds is pretty nice, so its not a full range receiver ??

Looking for some pics..

Cheers

Atul G.

Atul ,
The range check was done to 200 yards ( 600 ft )

The range of the radio/receiver is 300 - 800 m

Sai

Atul

Two denominations of the Assan receiver were tested. A large one (8 channel with two antennae) on the Easycub and a small one (six channel) with a short 2cm stub antenna on the Multiplex Fox. The large one (Sai, I do not know the name or spec number of these receivers... could you please elaborate on that) was fitted inside the canopy of the Easycub and the small white one was fixed by double sided tape on the outside of the Fox fuselage.


In all cases we never experienced any sort of glitch or servo-hum or unbinding of the receiver. Spec of these rxs assures operation even at 3vDc supply... So any sort of momentary dip of voltage will not create an unbind, I guess!!

Saju

Guys ,
Here is a link to Saurabh's review of the Assan Conversion:

http://is.gd/2a4RM

Sai

sai can you post some pictures of your fox conversion

sahil

Quote from: sahilkit on August 10, 2009, 12:10:27 PM
sai can you post some pictures of your fox conversion

sahil

Sure ill by evening

sai

Quote from: sahilkit on August 10, 2009, 12:10:27 PM
sai can you post some pictures of your fox conversion

sahil

Hi Sahil,

You will find a lot of pics of the conversion in my review. Do check them out. The link is given above by Sai. I suggest you download and then open the file. Would be more clear this ways

Dear Sai,
Thanks a lot for uploading the doc and sharing on the forum

Cheers !!!
Saurabh.

Quote from: saurabhhsrivastavaa on August 10, 2009, 12:40:01 PM

Quote from: sahilkit on August 10, 2009, 12:10:27 PM
sai can you post some pictures of your fox conversion

sahil

Hi Sahil,

You will find a lot of pics of the conversion in my review. Do check them out. The link is given above by Sai. I suggest you download and then open the file. Would be more clear this ways


Cheers !!!
Saurabh.

Saurabh ,
Sahil is asking about the conversion of Multiplex fox Glider 

  sai please tell me chord length of the wing ?? also got a lithium ion 3.7v 200mAh battery 8grams with low voltage cutt of
n receivers on the way hitec 4,5 gws 4 used for 20$

sahil

Hey saurabh,

superb review, very nicely and professionaly done mate..

gr8 work..

cheers

atul g.

Quote from: mpsaju on August 10, 2009, 12:00:09 PM
Atul

Two denominations of the Assan receiver were tested. A large one (8 channel with two antennae) on the Easycub and a small one (six channel) with a short 2cm stub antenna on the Multiplex Fox.
Saju

Here are the details of the two receiver :

1) X8 R6M 6Ch Micro 2.4GHz Receiver (Short Antenna)
2.4GHz receiver for Assan X8 systems.
Compatible with all X8 transmitters.
Size: 43 X 20 X 7mm (1.77 X 0.78 X 0.27 inch) 
Weight: 4.5g

2) X8 R7 7Ch 2.4GHz Receiver (Long Antenna)
2.4GHz receiver for Assan X8 systems.
Compatible with all X8 transmitters.
Size: 50 X 26 X 10mm (1.97 X 1.02 X 0.39 inch) 
Weight: 8g

They both work great In fact the have good range

Sai

Quote from: atul_pg on August 10, 2009, 01:54:50 PM
Hey saurabh,

superb review, very nicely and professionaly done mate..

gr8 work..

cheers

atul g.

thanks Mate... Will do the field review and flight check this Sunday. Will post my comments then. I am sure it will be great fun with 2.4 Assan.

Cheers!!
Saurabh

In what band of 2.4 does it transmit in DSS or FHSS and the bind/link channel it uses is 1 or 2 at a time.

Search the net you will find out there are Protocols apart from DSSS and FHSS. they are not the only ones.

Sai

I not good at searching the net Can you pls let me know you are doing the review

You are getting upset ok will not ask you anymore questions. Sorry if you do like me asking you any questions

Quote from: rckatty on August 10, 2009, 10:10:04 PM

You are getting upset ok will not ask you anymore questions.

Schematic for conversion of  Futaba 6 Exa to 2.4 G with Assan Hack Module .

http://is.gd/2bw85

Rgds
Sai

Hi,

One of my friend has this TX - Futaba FP-6NLK (Pretty old) http://manuals.hobbico.com/fut/5nlk-6nlk-manual.pdf
Just wondering if anyone can help confirming if this can be converted too.. Not sure if this has a PPM modulation.

Sai,
Could you comment please

Thnks
Saurabh

Saurabh ,

Any Radio with a PPM Board can be converted including AM .
I am not a techo but as I understand I explain in layman terms , any one correct me if I am wrong .

There are 2 parts to a radio's operations
1) Internal within the radio : something like intra functioning of the radio
2) External of transmission part

Now as I understand from what I have been told :
Part 1 normally operates on PPM for majority of the radios be it AM, FM , 2.4G or what ever .
Part 2 which is the carrier frequency is what is different . This is the RF module  which is like 35 , 40 , 72 Mhz , 2.4 G etc .

Hence as I have been told by most experts the Assan Module  is the part 2 plug in .
So basically it is operating on 2.4 G as a carrier .

I checked the Futaba 6 NLK is an FM radio  so I would think that it has a PPM board .
I hope I am right .
Hey all you guys out there correct me if I am wrong.
sai

Quote from: rcforall on August 11, 2009, 08:37:23 PM

I checked the Futaba 6 NLK is an FM radio  so I would think that it has a PPM board .
I hope I am right .
Hey all you guys out there correct me if I am wrong.
sai

Thanks Sai.
The last part answers my question. I certainly do understand that 2.4G is just the carrier. All I was wondering was whether this radio has a PPM output or not. I had a 6 Ch Esky Tx which was an FM tx but the RF board was integrated onto the main board. So it does not have a separate RF board or a PPM output. Just wanted to know if someone had a clue if this had a PPM output/separate FM board. Anyway thanks for your help.

Cheers
Saurabh.

Saurabh ,
The explanation  was not for guys like you it is for guys like me 

sai

Saurabh

All AM, FM or 2.4Ghz transmitters other than specific PCM systems has to have a conversion of the voltage set by your joystick positions to 1ms to 2ms (pulse width) square wave pulse per channel every 50ms. i.e. The first pulse would be a synchronising pulse, the width of the next pulse will corrspond to channel 1, the next to channel 2 and so on. This series of repeating pulses are then fed as a modulating wave to the RF board which modulates the carrier wave accordingly. This process of creating the modulating wave encompassing the joystick position data as pulse width is what we call as PPM... Pulse Position modulation. Please have look at http://www.aerodesign.de/peter/2000/PCM/PCM_PPM_eng.html
The RF board is nothing but creation and modulation of the carrier wave and subsequent driving of the Aerial. When viewed as two entities, any ppm board can be coupled with any RF board for transmission

Saju

Quote from: mpsaju on August 12, 2009, 12:23:59 PM
Saurabh

All AM, FM or 2.4Ghz transmitters other than specific PCM systems has to have a conversion of the voltage set by your joystick positions to 1ms to 2ms (pulse width) square wave pulse per channel every 50ms. i.e. The first pulse would be a synchronising pulse, the width of the next pulse will corrspond to channel 1, the next to channel 2 and so on. This series of repeating pulses are then fed as a modulating wave to the RF board which modulates the carrier wave accordingly. This process of creating the modulating wave encompassing the joystick position data as pulse width is what we call as PPM... Pulse Position modulation. Please have look at http://www.aerodesign.de/peter/2000/PCM/PCM_PPM_eng.html
The RF board is nothing but creation and modulation of the carrier wave and subsequent driving of the Aerial. When viewed as two entities, any ppm board can be coupled with any RF board for transmission

Saju

Awesome !!! Thanks a lot Saju !!! This makes sense.

All you are talking about the pulse generated at a particular stick position that is fed to the RF board for transmission. I am in complete understanding and agreement to this. All I was wondering was if this Futaba NLK radio has a separate RF board or integrated to the main board itself.. I have actually not seen the tranmitter yet so not sure if the RF is integrated to the main board or is separate. ANyway will do this conversion soon once Sai gets his new oder and then let you guys know about my experience. I am sure I would be able to locate the Modulation port and then install the hack. Thanks for all your help and inputs.

Cheers!!!
Saurabh.