NEW Tx module Frsky DJT and Rx D8R Telemetry - RC Groups
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Oct 05, 2010, 08:35 PM
nakelp86's Avatar

NEW Tx module Frsky DJT and Rx D8R Telemetry

The new module from Hobby King came in today and there is a CD with some (shady for me ) instructions.
Is there anyone using this module who is willing to share some more infos, set up, range and so on.
I read something about Frsky before I ordered it but faile to save the page and cant find much about it now.
If I remember correctly it was compared to BEVRC long range module.
Last edited by nakelp86; Oct 05, 2010 at 08:43 PM.
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Oct 05, 2010, 11:17 PM
Registered User
alexcmag's Avatar
There are another threads about this modules and telemetry on and

Anyway, i tested over 2874m, but some users reported 5200m, almost twice, both cases with no RSSI alarm, meaning it's OK at this distance, not over or near limit.
Oct 05, 2010, 11:28 PM
nakelp86's Avatar
Great thx for the links
Now I just have to learn how to set it all up
Oct 05, 2010, 11:48 PM
nakelp86's Avatar
Could you show some pictures of your set up (the plane) how did you mount the antennas?
Oct 06, 2010, 01:57 AM
Registered User
Antenna setup depends about flying pattern: far and low, high over head, or mixed.
But is not something FrSky specific, you place them as for any other dual antenna 2.4Ghz system, there are many threads debating this.
Oct 06, 2010, 07:35 PM
nakelp86's Avatar
hmm the point is I never had dual antennas so I know only they have to be at 45 degrees to each other.
Oct 06, 2010, 07:40 PM
I don't want to "Switch Now"
pmackenzie's Avatar
Originally Posted by nakelp86
hmm the point is I never had dual antennas so I know only they have to be at 45 degrees to each other.

90 degrees
And ideally away from all wires, electronics and carbon parts

Pat MacKenzie
Oct 06, 2010, 09:01 PM
nakelp86's Avatar
Aha so its 90
thx.The wiskers will come out from fuse and bend up in gentle curve from horizontal.
Hopefully that will solve many problems.
So far I did not see one negative about the system.
Im happy :-)
Oct 06, 2010, 11:15 PM
60 years of RC flying
Daedalus66's Avatar
The active part of the antennas is the last 33mm, which is silvery. That's what needs to be reasonably straight. The rest can be curved but should not be kinked as it can be damaged. The two antennas should be arranged so that the active sections are well separated, approximately at right angles, and not too close to conductive stuff (battery, wires, CF, etc.). You don't need to get things exact, just follow the basic principles. By having the antennas at right angles and separated you ensure that at least one should be getting a decent signal at any given time.

It's an excellent radio and should give more range that you can use.
Oct 09, 2010, 12:19 PM
New in all but 20Y hobbyist
lothar2048's Avatar
Does someone have an idea hot to plug the RSSI port on a CE OSD (BEVRC). Does the RSSI port can be used as is, as the CEOSD claims a 3.3volts measurement and the D8R a provides a 5v ?

I've read around that i would need a RSSI buffer between. That's ok with that, but wich one can be used on this case ?
Oct 09, 2010, 01:02 PM
Registered User
No RSSI from this receiver, but you don't need it in OSD, you have acoustic feedback of link quality in the Tx module buzzer.
There are 2 long threads dedicated to FrSky, one for general RC usage, and one for telemetry. These things and many more were already discussed there.
Oct 09, 2010, 04:28 PM
New in all but 20Y hobbyist
lothar2048's Avatar
Can you give me the link for this, i was not able to find it.
By the way, my question is still in the air. I would like to combine both visual RSSI trhought the RSSI port availeble on CE OSD and both telemetry. Receiver port 3 gives the RSSI signal. I was just asking to someone who knows about it, not someone who don't...
Oct 09, 2010, 04:37 PM
Registered User
Maybe you talk about a different product.
Frsky telemetry receiver does not issue RSSI on ANY port, period.
Maybe you talk about the three lateral dedicated telemetry ports, but even here you didn't get it right, all are inputs, none is output.
The main FrSky thread was permanently in the first page of radios forum in the last months, it is very active, look again, it is there right now.
Oct 09, 2010, 04:46 PM
I don't want to "Switch Now"
pmackenzie's Avatar
I think you mis-understand what they mean by "receiver interface 3: RSSI of Rx".

The alarm can be configured to respond to either of the two analog inputs on the airborne receiver, or to the RSSI signal which is internal to the airborne receiver.
The other input to the airborne unit is RS232 for user data. The only "outputs" it has are to drive servos.

So the only way to access the RSSI signal (which they call "link quality") would be to extract it from the telemetry data on the ground through the RS232 interface.

RENATOA can confirm, as an early adopter/reseller he does pretty much know everything about the FrSky system.

Pat MacKenzie
Oct 09, 2010, 04:53 PM
New in all but 20Y hobbyist
lothar2048's Avatar
I confirm the Analog ports are dedicated inputs, the RSSI port is input/output due to RS232 compatibility... Read up the documentation here plz : , page 6 and 7.

This port is already used by some users of the RVOSD and the Eagletree OSD Pro wich can integrate some RS232 interfacing with a 3 pin communication cable. I'm trying to find a way to make it compatible with the CEOSD wich only have a serial one way port...

Buffering seems to be the final way, but i did not found any help regarding the receiver topology here... Of course, Frsky does not respond to mails regarding those unsupported issues...

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