459MHz UHF legal Tx and Rx - Arduino based programability.

[Dennis Frie]

I have an RF-meter and can do a quick power-test later, but as it's made for 1000mw max, it's hard to see a deviation around 100 mw.

[Devonian]

The problem is that the Tx is 'pulsing' at 50Hz and unless you have 'peak hold' on your RF meter, you will have a problem to measure the RF.
You will also need to set the module for single frequency output.
MY RF-meter is good to 1Kw - 100mW doesn't even make the meter twitch.

I made an RF-head and used a DVM to measure the voltage to then calculate the RF output.

I seem to remember reading that you can program the module for continuous output (at reduced RF level) -- or did I dream that?

Nigel.

[Dennis Frie]

I just use an oscilloscope or a microcontroller, works perfect  ;D

Actually, on this previous test with RF-meter it actually seems like 459 mhz have higher output. Not quite sure I would believe that.

[Splashy]

I just use an oscilloscope or a microcontroller, works perfect  ;D

Actually, on this previous test with RF-meter it actually seems like 459 mhz have higher output. Not quite sure I would believe that.

With my little test using the Spectrum Analyzer I found that the output at 459 Mhz was higher than that at 439.

[Dennis Frie]

Was that test with normal antennas or with the transmitter and receiver connected directly with attenauter?

[Splashy]

It was with 459Mhz tuned antenna.

[zitron]

I seem to remember reading that you can program the module for continuous output (at reduced RF level) -- or did I dream that?

Nigel.

I think you can use the PN9 Mode, Register 71h, Modulation Mode Control 2, p35 in the si4432 data sheet. Basically it will continuously output random data based on a polynominal:

The primary purpose of this mode is for use as a test mode to observe the modulated spectrum without having to load/provide data.

[Dennis Frie]

For antenna-measurements with SWR-meter I have just changed the standard-firmware a bit. You can pretty easy get almost continuous output and make frequency-sweep. Can't remember exactly what I changed, but think I just removed all unnecessary time-consuming code, increased the FIFO-buffer to max and repeated to send random packets. 

[WSWhitby]

Hi,
I was wondering why we have not had any posts in the last 120 days. I am always a little slow of the mark so the silence has passed me by. Its a great pity as I was about to try "459 MHz UHF legal" but have a number of questions:
Have you all moved your comments to another Forum?
How do I connect to a Futaba 35Mhz 9X with square "buddy lead socket"(Connection diagram Please),
Has the issue of power drop at 459 been resolved?
Where can I find instructions on building/making/obtaining tuned antenna ?
Is it worth my time/effort and money in obtaining and using this system for medium range FPV on fixed wing and Hex copter. My Video gear is 2.4Ghz so I am unable to use my Futaba 10C and have to revert to 35Mhz 9X with the disadvantage when flying my quad with a long trailing antenna. I have read most of the 20 pages of this forum thread and had a quick look on the Flytron forums but specific answers to the above questions seem to be missing.

Any help or advice welcome

Regards

John

[Chilternflyer]

??
I'm currently using a Dagonlink and would like to use the Orange LS stuff on 459 (if it works).
So what happened to this thread and where is everyone now??

Was this project abandoned?

[thundead]

hey mate :) everyone moved to this thread lol: http://www.fpvhub.com/index.php/topic,5002.645.html

regards,
Mihai.