Posts: 365 Threads: 59 Likes Received: 41 in 36 posts Likes Given: 352 Joined: Nov 2021 Reputation: 1 hello all,
preferrably the Spektrum users who own DSM2/DSMX receivers. i am looking at the Geprc Phantom BNF in Banggood which is only avail in DSM2/DSMX R720X serial receiver version. i would have preferred the Frsky XM+ due to its dual antennas and RSSI via OSD, so does this specific Spektrum RX have the same feature set and more importantly fullrange capability?
cheers! ![[-]](https://intofpv.com/images/collapse.png) • Posts: 365 Threads: 59 Likes Received: 41 in 36 posts Likes Given: 352 Joined: Nov 2021 Reputation: 1 hmm, after almost 24hrs it seems most of the intofpv.com folks covered by this time zone are not spektrum users!?? • Posts: 21,414 Threads: 595 Likes Received: 9,037 in 6,688 posts Likes Given: 1,428 Joined: Jun 2018 Reputation: 796 Nope. Spektrum is used by very few multirotor users so you might struggle to get much help on here with Spektrum gear. I would probably advise that you just contact Horizon Hobby who actually own the Spektrum brand and ask them directly... https://www.horizonhobby.com/contact Posts: 1,529 Threads: 49 Likes Received: 720 in 531 posts Likes Given: 481 Joined: Oct 2020 Reputation: 93 16-Jan-2022, 03:53 AM (This post was last modified: 16-Jan-2022, 03:55 AM by V-22.) I haven't used Spektrum for any multirotor stuff, but this was the first Google result: https://www.spektrumrc.com/Products/Defa...D=SPM4649T If you already have a Frsky radio, just swap out the Spektrum RX for a different one. For the same money, you could almost get an ELRS setup. The following 1 user Likes V-22's post:1 user Likes V-22's post • hawk01 Posts: 3,288 Threads: 129 Likes Received: 2,740 in 1,644 posts Likes Given: 2,969 Joined: Apr 2017 Reputation: 65 What radio do you have? I ask because if you have a multi module, then you could just bind it to that. The R720X does not appear to have a wire to attach to a UART's TX pad so likely no telemetry. Another option is to purchase it and see if it meets your needs. If it does not, simply wire in an XM+ receiver yourself. SoCal Kaity :D
OMG, no one told me it would be this much fun! Addicted :) Posts: 365 Threads: 59 Likes Received: 41 in 36 posts Likes Given: 352 Joined: Nov 2021 Reputation: 1 much appreciated inputs from you all!
i have an incoming radiomaster TX16S so binding it would not be an issue. i was only contemplating DSM since the bnf quad i would like to buy is only avail with DSM external R720X receiver. with your kaitylynn comments on the said rx i might as well wait for the XM+ version and call it a day as telemetry and RSSI is essential to my needs.
cheers! • Posts: 3,288 Threads: 129 Likes Received: 2,740 in 1,644 posts Likes Given: 2,969 Joined: Apr 2017 Reputation: 65 If you are wanting telemetry, the XM+ will not suit your goals. You will want to look into the R-XSR receiver instead. The XM+ will only give RSSI. SoCal Kaity :D
OMG, no one told me it would be this much fun! Addicted :) Posts: 365 Threads: 59 Likes Received: 41 in 36 posts Likes Given: 352 Joined: Nov 2021 Reputation: 1 (17-Jan-2022, 02:17 AM)kaitylynn Wrote: If you are wanting telemetry, the XM+ will not suit your goals. You will want to look into the R-XSR receiver instead. The XM+ will only give RSSI. btw, just a follow up is the R-XSR better or as equally reliable as the XM+ as a fullrange receiver and all? while is see the XM+ on many bnfs, i do see quite a few with R-XSR onboard. while i do read it still has ACCST it can also be flashed ACCESS. • Posts: 21,414 Threads: 595 Likes Received: 9,037 in 6,688 posts Likes Given: 1,428 Joined: Jun 2018 Reputation: 796 An XM+ has a slightly longer range than an R-XSR, but if you are flying out past 500m from yourself then you really need to be looking to move away from FrSky receivers and onto something like ExpressLRS, TBS Crossfire, or ImmersionRC Ghost for your RC link.
The XM+ is put on many BNF quads because it is cheap and more people have native ACCST capable transmitters than anything else, so a BNF quad with an XM+ on it will appeal to a fairly wide audience. Posts: 365 Threads: 59 Likes Received: 41 in 36 posts Likes Given: 352 Joined: Nov 2021 Reputation: 1 (18-Jan-2022, 01:29 PM)SnowLeopardFPV Wrote: An XM+ has a slightly longer range than an R-XSR, but if you are flying out past 500m from yourself then you really need to be looking to move away from FrSky receivers and onto something like ExpressLRS, TBS Crossfire, or ImmersionRC Ghost for your RC link.
The XM+ is put on many BNF quads because it is cheap and more people have native ACCST capable transmitters than anything else, so a BNF quad with an XM+ on it will appeal to a fairly wide audience. much appreciated inputs sir! how much longer is slightly longer range for the XM+? and realistically how much range may i expect with the R-XSR? my utilization at the moment is generally restricted urban flying. imagine a golf driving range sprinting 300yards max! i typically prefer closer proximity within <200yards flying acro hoping i can concentrate more on the flying instead of the RSSI dipping below 20 or the OSD flashing RXLOSS thanks to the SPI receiver that came with my crux3. i would also like to have decent penetration outdoor flying against trees, some walls, etc. while CRSF does have merits, i still deem it overkill for my needs as i am not going into hardcore LR or heavy penetration around and into buildings anytime soon. • Posts: 3,288 Threads: 129 Likes Received: 2,740 in 1,644 posts Likes Given: 2,969 Joined: Apr 2017 Reputation: 65 The Bug, my 2.5" build, is equipped with an RXSR and I can get it out to about 750m before I begin to feel uncomfortable. I have had it out to 1.2km and it worked, but I feel I was really at the receiver's ragged edge. I have had to XM+'s out to 1.5km before I started to get that feeling that I am about to experience a failsafe.
Either RX will work for the ranges you intend to fly, the RXSR will provide you telemetry so that you know what the quad itself is doing. It will also allow you to pipe GPS data back to your OSD and radio's telemetry screen so you have a better idea where you "unintentionally landed" your aircraft.
If I still flew FrSky equipment, I would select the RXSR over the XM+ 99% of the time. The only instance where the XM+ would be my choice would be where there is no advanced FC like on a wing with just a stabilizer board. SoCal Kaity :D
OMG, no one told me it would be this much fun! Addicted :) Posts: 1,845 Threads: 203 Likes Received: 346 in 264 posts Likes Given: 306 Joined: May 2020 Reputation: 11 A pilot who uses the your channel ( Timmy RC ) is a Spektrum user.
If you send him a message on his channel he may have some good advice.
Horizon hobbies would have some answers.
If you are thinking of getting in the hobby consider your future needs. Posts: 21,414 Threads: 595 Likes Received: 9,037 in 6,688 posts Likes Given: 1,428 Joined: Jun 2018 Reputation: 796 (18-Jan-2022, 01:48 PM)hawk01 Wrote: how much longer is slightly longer range for the XM+? and realistically how much range may i expect with the R-XSR? my utilization at the moment is generally restricted urban flying. imagine a golf driving range sprinting 300yards max! i typically prefer closer proximity within <200yards flying acro hoping i can concentrate more on the flying instead of the RSSI dipping below 20 or the OSD flashing RXLOSS thanks to the SPI receiver that came with my crux3. i would also like to have decent penetration outdoor flying against trees, some walls, etc. Kaity has already answered your question regarding her own personal experiences with the range limits of both receivers, so there is nothing more that I can really add to that. There are also videos on YouTube that demonstrate the XM+ generally having a further range than the R-XSR. I started getting low RSSI values when flying out to ~600m with my R-XSR so I was never confident to push it any further than that. (18-Jan-2022, 01:48 PM)hawk01 Wrote: while CRSF does have merits, i still deem it overkill for my needs as i am not going into hardcore LR or heavy penetration around and into buildings anytime soon. The other available RC Links aren't just about range and penetration. They are also about reliability / resilience of the link itself and the ability of it to hold up against external RF interference and a high noise floor even at close range. It all depends on what type of environment you fly in, but in an urban area there can be a lot of external RF interference from domestic equipment like WiFi, Smart Home Devices, Alarm System etc. etc. all of which can cause havoc with other 2.4GHz equipment running a standard modulation. ExpressLRS, Crossfire, and Ghost all use a modulation called LoRa which is extremely resilient to external interference on the same frequency band. I experienced a number of failsafes when using FrSky 2.4GHz equipment but since I started using Crossfire a couple of years ago I have NEVER had another single failsafe (knock on wood). It means that I no longer have to worry or start getting nervous about my RC link failing. Another thing to be mindful about is the orientation of the antenna on your transmitter. The standard (non-LoRa) 2.4GHz systems aren't very forgiving of that. The video at the bottom of the following post demonstrates that scenario with the result being a failsafe at quite close range (less than 100m)... https://intofpv.com/t-reminder-the-impor...rientation Posts: 365 Threads: 59 Likes Received: 41 in 36 posts Likes Given: 352 Joined: Nov 2021 Reputation: 1 (18-Jan-2022, 04:33 PM)SnowLeopardFPV Wrote: Kaity has already answered your question regarding her own personal experiences with the range limits of both receivers, so there is nothing more that I can really add to that. There are also videos on YouTube that demonstrate the XM+ generally having a further range than the R-XSR. I started getting low RSSI values when flying out to ~600m with my R-XSR so I was never confident to push it any further than that.
The other available RC Links aren't just about range and penetration. They are also about reliability / resilience of the link itself and the ability of it to hold up against external RF interference and a high noise floor even at close range. It all depends on what type of environment you fly in, but in an urban area there can be a lot of external RF interference from domestic equipment like WiFi, Smart Home Devices, Alarm System etc. etc. all of which can cause havoc with other 2.4GHz equipment running a standard modulation. ExpressLRS, Crossfire, and Ghost all use a modulation called LoRa which is extremely resilient to external interference on the same frequency band. I experienced a number of failsafes when using FrSky 2.4GHz equipment but since I started using Crossfire a couple of years ago I have NEVER had another single failsafe (knock on wood). It means that I no longer have to worry or start getting nervous about my RC link failing.
Another thing to be mindful about is the orientation of the antenna on your transmitter. The standard (non-LoRa) 2.4GHz systems aren't very forgiving of that. The video at the bottom of the following post demonstrates that scenario with the result being a failsafe at quite close range (less than 100m)...
https://intofpv.com/t-reminder-the-impor...rientation your comment about the reliability and resilience of the RC link and its ability to hold up against external RF interference had me pondering over my present woes with the crux3 and its measly SPI receiver. i fly in an urban environment, the primary location within a residential area where RF is obviously a threat in the form of mostly home wi-fi with powerful mesh systems, etc among other sources of this invisible enemy. i am beginning to suspect having an entry level AIO with SPI rx is not doing me any favors at all. this location is where all my RXLOSS and death spin events occurred. while the onboard equipment may also be suspect, i never encountered those issues flying at the local golf driving range which is modestly isolated from RF pollution. so as an experiment with my present resources on hand, i am planning to install a serial receiver into the crux3 to see if it will perform better in the RF noisy location if only to verify the weakness of the AIO with SPI rx. cheers! • Posts: 21,414 Threads: 595 Likes Received: 9,037 in 6,688 posts Likes Given: 1,428 Joined: Jun 2018 Reputation: 796 (20-Jan-2022, 08:56 AM)hawk01 Wrote: so as an experiment with my present resources on hand, i am planning to install a serial receiver into the crux3 to see if it will perform better in the RF noisy location if only to verify the weakness of the AIO with SPI rx. You will definitely get better performance using an external receiver. The SPI receivers are flaky at best. Only useful for flying really close to yourself IMO. If you never want to look back then just invest in an ExpressLRS 2.4GHz module and get yourself an EP2 receiver (the one with the ceramic antenna), then you will wonder why you didn't just do that in the first place and you will have a big smile on your face  • |
