Since I was accused of "getting defensive about 2.4", and I am tired of playing defense, let me play offense for a little while

So why do you think FM radios (that is PPM/PCM systems in any band like 72Mhz, 40Mhz, 35Mhz) etc are not worth the trouble any more (as compared to 2.4Ghz radios) ?

Here is my list to start with....

1. Anyone can cause your model to crash by turning on their radio on the same channel, either by mistake or intentionally.  That is a truly uneasy feeling, which one has to suffer through every time you go flying, especially in places where many people fly together.

2. Forgetting to extend the antenna before take off results in loss of control.

3. You have hunt down the right type and channel of crystal.

4. PPM communication is susceptible to static build-ups, especially in the case of electric helis with rotating belts. 

5. One has to be careful everytime some one comes into the field for the first time, or when someone comes in with new equipment, as channel selection/assignment has to be verified. If some has the same channel as yours, you have to take turns and wait.

Point 1 and 5 are the same   

Point 3 you don't you have synthesized receivers .

that leaves only points 2 and 4 .
Point 2 is general reflex action which comes naturally its like pointing the antenna of a 2.4 radio towards the plane 

Point 4 is a possibility accepted .

BTW have you announced the next prize that you are in such a hurry to get the post count up again.
Sai

6. 72Mhz etc communication is susceptible to ignition noise on gas engines.

God, where is my memory when I really need it  

Quote from: rcforall on August 04, 2009, 05:28:23 PM
Point 1 and 5 are the same   
that leaves only points 2 and 4 .
Sai

The biggest point is 1 and/or 5.  So it is not only 2 and 4, there is HUGE 1 and/or 5 along with it !

Most importantly, we are just starting down the list  

Quote from: anwar on August 04, 2009, 05:31:28 PM

Quote from: rcforall on August 04, 2009, 05:28:23 PM
Point 1 and 5 are the same    

Most importantly, we are just starting down the list  

 pros and cons of Mhz radios would be a good title to build  a data base.

One other negative which you forgot is transmission on the same band by non rc transmissions.

See I have an open mind   not biased

sai

oh sai uncle how is your 2.4ghz conversion going on i heard that u shall stock these modules i might buy it for the new futaba 6exap

Here is one more.
-Hate the RX antenna spoiling the look of my scale airplane. And even if not scale, i prefer the "clean" 2.4 Ghz looks.

7.  PCM, which is the more widely used one, is known to mask interferences/glitches up to a certain level, causing small problems to go un-noticed initially.  Finally, after crossing a threshold, the glitches surface in its full force, causing loss of control/communication ("PCM lockouts") for possibly up to many seconds.

Now especially with Synthesized receivers available PPM/FM is widely used

I thought many war birds actually had an external antenna.

This thread will really go a long way to reaching 5 K fast

sai

8..  You have to properly extend and secure the RX antenna, otherwise the range is affected significantly.

9..  In addition to crystal restrictions on type (dual/single conversion) and channel, there are differences in size (mini versus full size) and "hi-lo" band restrictions.  All of these cause issues with sourcing and sharing of equipment.

Quote from: anwar on August 04, 2009, 06:03:33 PM

9..  In addition to crystal restrictions on type (dual/single conversion) and channel, there are differences in size (mini versus full size) and "hi-lo" band restrictions.  All of these cause issues with sourcing and sharing of equipment.

No longer a problem with Synthesised receivers I can use my JR , FUTABA, W Fly , Turborix , Kyosho , Graupner  and any other transmitter on the same receiver the receiver costs 1/2 the price of any original receiver .

Quote from: Pikle6 on August 04, 2009, 05:47:08 PM
oh sai uncle how is your 2.4ghz conversion going on i heard that u shall stock these modules i might buy it for the new futaba 6exap

2.4 Ghz module for Futaba 6exap ? Wow now thats new !!!

i dont think 6EX has module. please check.

Quote from: anwar on August 04, 2009, 06:03:33 PM
8..  You have to properly extend and secure the RX antenna, otherwise the range is affected significantly.

You have to get the 90 deg angle on the 2.4 G receiver as well

Quote from: saurabhhsrivastavaa on August 04, 2009, 06:08:26 PM
2.4 Ghz module for Futaba 6exap ? Wow now thats new !!!

i dont think 6EX has module. please check.

People here are too advanced   They are talking about this :

http://www.rcindia.org/radios-and-receivers/2-4ghz-or-723540mhz-(ppm)-diy-frequency-selectable-transmtter/

Quote from: saurabhhsrivastavaa on August 04, 2009, 06:08:26 PM

Quote from: Pikle6 on August 04, 2009, 05:47:08 PM
oh sai uncle how is your 2.4ghz conversion going on i heard that u shall stock these modules i might buy it for the new futaba 6exap

2.4 Ghz module for Futaba 6exap ? Wow now thats new !!!

i dont think 6EX has module. please check.

Saurabh ,
Check this link
http://www.rcindia.org/radios-and-receivers/2-4ghz-or-723540mhz-(ppm)-diy-frequency-selectable-transmtter/

And this Video :


Posted earlier by Atul in this thread
http://www.rcindia.org/radios-and-receivers/interesting-article-on-2-4-g-and-the-diff-between-dsss-and-fhss/15/

but since I don't know how to link it here posted the link again (Anwar please help)

Will be getting the Assan Modules soon I am going to be using one so one is spare from the 1st lot.

rethink selling your 6 eax you can do this easily
sai

Sai

Quote from: rcforall on August 04, 2009, 06:16:27 PM
Saurabh ,
Check this link
http://www.rcindia.org/radios-and-receivers/2-4ghz-or-723540mhz-(ppm)-diy-frequency-selectable-transmtter/

Will be getting the Assan Modules soon I am going to be using one so one is spare from the 1st lot.

rethink selling your 6 eax you can do this easily
Sai

WOW !!! this is kooool... I dint know this... surely will wait for this ... please let me know when u have the module... and  let me know the performance as well... Thanks SAI...


Regards,
Saurabh

Sai Let me know once you have the module... Will directly buy from you.

Thanks
Saurabh

Saurabh look at the video it is amazing

Anwar hardluck the thread has again been hijacked by 2.4G

sai

Quote from: rcforall on August 04, 2009, 06:09:29 PM

You have to get the 90 deg angle on the 2.4 G receiver as well

Sure, but see how this list is similar yet longer ?

And I have not even started on LoS and weather issues !

Quote from: rcforall on August 04, 2009, 06:26:02 PM
Saurabh look at the video it is amazing

Anwar hardluck the thread has again been hijacked by 2.4G

sai

Can you please post the link to the video...

Thanks.
Saurabh

Saurabh,
Its on page 1 of this thread.

Anwar ,
One of the biggest plus in buying a Mhz radio .
I can convert it to 2.4 G with a cheaper Module and continue to use cheaper receivers at 1/2 the price with both my Mhz as well as 2.4 G .

This is having the best of both worlds.

sai

Quote from: rcforall on August 04, 2009, 05:56:52 PM
Now especially with Synthesized receivers available PPM/FM is widely used

sai

Traditional PPM/FM is even worse, since they lack the ability to filter bad signals as compared to even PCM.  Using them just for the sake of being synthesized ?  Hmmm...

Quote from: rcforall on August 04, 2009, 06:46:51 PM
Anwar ,
One of the biggest plus in buying a Mhz radio .
I can convert it to 2.4 G with a cheaper Module and continue to use cheaper receivers at 1/2 the price with both my Mhz as well as 2.4 G .

This is having the best of both worlds.

sai

You can always get Assan 2.4, if you are looking for cheap, and have the "peace of mind' that comes with it ?

One world is "best", the other is "so so"    Why mix up the two 

Coming to think of it I think you can also recycle old AM tx's with a PPM Board to 2.4 G using a hack Module .

sai

Quote from: anwar on August 04, 2009, 06:53:25 PM

One world is "best", the other is "so so"    Why mix up the two  

Who would not love  both worlds if they  can get it at 1/2 the price of the first world  

Want to have poll