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Best interference free 2.4 tx under ?350?

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MattyB25/09/2020 08:50:47
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Posted by Doctor Chinnery on 24/09/2020 23:50:36:

I've had a Multiplex Cockpit set up since they first came onto the market - I have never knowingly suffered with interference or signal loss since - okay, the newer Cockpits are relatively expensive, but programming is pretty straightforward. AND an Mpx Cockpit feels absolutely "right" in your hands, something you can't say about some of the modern offerings from the USA/Far East

Have you held one of the newer versions though? The old one was a bit of an ugly duckling but I agree was very comfortable, particularly if you had small-med hands. The new one though went all boxy similar to the Profi (what a disaster for Mpx that was...) and is markedly less comfortable as a result.

As I said above, reliable kit but for me they are top of the list of manufacturers who may not survive the next 5 years in the radio market given the fierce competition they are experiencing.

 

 

 

Edited By MattyB on 25/09/2020 08:51:50

Peter Miller25/09/2020 08:51:34
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Never had a problem with my Spektrum and mine was one of the first in the country.

None of the other later Spektrums in the club have ever given any trouble.

Never had a problem with my Hitec Aurora 9.

I know that the early Spektrum 8s has a lot of trouble there was one in the club.

Steve J25/09/2020 09:00:10
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Posted by MattyB on 25/09/2020 08:50:47:

As I said above, reliable kit but for me they are top of the list of manufacturers who may not survive the next 5 years in the radio market given the fierce competition they are experiencing.

Jeti at one side, OpenTx at the other and Multiplex squeezed in the middle.

Jason-I25/09/2020 10:59:30
335 forum posts
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Posted by Peter Miller on 25/09/2020 08:51:34:

Never had a problem with my Spektrum and mine was one of the first in the country.

None of the other later Spektrums in the club have ever given any trouble.

Never had a problem with my Hitec Aurora 9.

I know that the early Spektrum 8s has a lot of trouble there was one in the club.

Total opposite to my experience. I have has 3 spektrum transmitter fail - all RF Board related & requiring manufacturer repair (DX9's & DX5). Reading online it seems I am not alone with this fault.

The cost of 9 channel spektrum telemetry receivers is also an issue, especially when you factor in having to add extra remote 'satellite' rx's due to the lousty range they have.

All in all, if I was starting out again, I would avoid Spektrum.

Andy Stephenson25/09/2020 11:14:24
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Four members of our club had unexplainable crashes with Spektrum so they all changed brand to Futaba and as far as I know have been trouble free ever since.

My advice it to go with the brand that has the longest history in professional and hobby R/C manufacture.

A.

Martin Harris25/09/2020 11:32:23
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Posted by Brian Cooper on 25/09/2020 01:57:54:

I was asked to test-fly a new Wot 4 XL for a club buddy recently. It was (is) equipped with Multiplex equipment. . A couple of minutes into the flight, the ailerons reversed themselves. crook . . It was certainly a challenge to get it down, but the main thought going through my mind was, "what else will reverse before it lands?"

It was landed with no damage, and we reversed the ailerons back. The only thing we could attribute the problem to was my buddy having a mobile phone in his pocket. . Much head scratching. .....!!

. . . .

Spektrum DSMX has proved to be bomb proof for me for several years.

.

Wasn’t it a Multiplex transmitter which was proved to be prone to programming corruption back in the early days of debate over whether mobile phones were a hazard near the flight line? As far as I know, it was the only repeatably demonstrated example of a problem.

David Hall 925/09/2020 11:34:31
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There are a lot of cheap (and sometimes quite nasty) "compatible" receivers available, particularly for Spektrum protocols. There may be a tendency to blame the Tx make as problematic when it may be the Rx copies.

Although in my club, many members use one or two popular, cheap Spektrum compatible receivers, my own experience on the bench caused me to bin the two that I had. It wasn't the Spektrum system that was a problem, for me, it was poor PSU noise immunity (brown-outs).

Frank Skilbeck25/09/2020 11:41:29
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Posted by Martin Harris on 25/09/2020 11:32:23:
Posted by Brian Cooper on 25/09/2020 01:57:54:

Wasn’t it a Multiplex transmitter which was proved to be prone to programming corruption back in the early days of debate over whether mobile phones were a hazard near the flight line? As far as I know, it was the only repeatably demonstrated example of a problem.

I maybe wrong but i thought it was one of the Futaba 9 channel sets. But some MPX programmable transmitters were around before the days of mobile phones, so may not have been designed accordingly.

I've got 4 MPX programmable transmitters (35mhz and 2.4 Ghz), Jeti DS12, Spektrum Dx6i, and also had a Futaba FF6 (35 Mhz), never had a mobile phone problem with any of them, nor a reception problem.

As far as I am aware at our club field we have never seen any 2.4 GHz interference (Multiplex, Spektrum, Frsky, Hitec, Jeti, Futaba, Detrum and Flysky), but have seen transmitter faults on a couple of Spektrums (early Dx8 and a Dx6) and a Futaba 6EX

But if you are worried about interference on 2.4 GHz, there's a couple of fliers at our club using Frsky Taranis radios with 900 MHz modules as they understand this has better range and is less prone to interference.

Edited By Frank Skilbeck on 25/09/2020 11:47:44

Brian Cooper25/09/2020 12:27:53
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Posted by Martin_K on 25/09/2020 06:35:50:
Posted by Brian Cooper on 25/09/2020 01:57:54:

It was landed with no damage, and we reversed the ailerons back......

What exactly was changed? A logic setting configured in a software interface? Something controlled via physical switches?

Multiplex: Two channels changed their direction. Presumably something got into the computer settings and gave it a kick.  As luck(?) would have it, it was the two aileron channels (one channel on each aileron) which changed. . On future flights, it might just as easily be any other channels...... who knows..!!? . . However, in the great lottery which has presented itself, it is kind-of good fun wondering how many channels will still be working in the correct sense when the model lands. smile o

.

I shall stick with my tried, proven and utterly reliable Spektrum DSMX equipment. yes 

.

Edited By Brian Cooper on 25/09/2020 12:30:16

Ron Gray25/09/2020 12:54:23
2383 forum posts
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Simple logic says that if you want less risk of interference then move away from the congested 2.4GHz band, and move to 868MHz.

Steve J25/09/2020 13:32:19
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Posted by Ron Gray on 25/09/2020 12:54:23:

Simple logic says that if you want less risk of interference then move away from the congested 2.4GHz band, and move to 868MHz.

An alternative viewpoint is that there is a lot of development work done by electronics companies on products for 2.4GHz because it's a huge market which leads to chips like the excellent Cypress one in the new Spektrum receivers.

Doc Marten25/09/2020 13:47:48
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Posted by martin collins 1 on 24/09/2020 17:34:38:

I don`t want a manufacturer bashing thread, i have heard of problems on at least 3 different makes and seen planes lost to some form outside signal on different gear. Only interested in hearing what people would spend their money on that works with the most reliable channel switching set up.

 

Are you glad you asked now Martin?

It's one of  the RC modelling eternal, unanswerable questions

 

Edited By Doc Marten on 25/09/2020 13:51:47

MattyB25/09/2020 15:24:22
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Posted by Brian Cooper on 25/09/2020 12:27:53:
Posted by Martin_K on 25/09/2020 06:35:50:
Posted by Brian Cooper on 25/09/2020 01:57:54:

It was landed with no damage, and we reversed the ailerons back......

What exactly was changed? A logic setting configured in a software interface? Something controlled via physical switches?

Multiplex: Two channels changed their direction. Presumably something got into the computer settings and gave it a kick. As luck(?) would have it, it was the two aileron channels (one channel on each aileron) which changed. . On future flights, it might just as easily be any other channels...... who knows..!!? . . However, in the great lottery which has presented itself, it is kind-of good fun wondering how many channels will still be working in the correct sense when the model lands. smile o

I shall stick with my tried, proven and utterly reliable Spektrum DSMX equipment. yes

A sample of one does not really prove anything though does it?! My Dad and I have >1000hrs of flying on Multiplex TXs, and I’m a member of one of the biggest soaring clubs in the UK where Mpx transmitters were the most popular brand in the 90s and noughties. I’ve never heard or seen such an issue occur on Mpx gear (or any other for that matter) so it hardly seems like a factor to choose your TX onon. I have however seen numerous (>5 across two clubs) burnt out Spektrum RF boards, though the rate of those occurring does seem to have slowed in recent years.

By far the biggest causes of issues remain power supply failures, poorly installed antennas and dumb thumbs that were blamed on radio failure. Avoid these pitfalls and any FHSS based system will work fine 99.999% of the time.

ken anderson.25/09/2020 15:29:47
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meanwhile getting back to martin's opening question....has any of this helped martin?...because this thread is heading as was predicted into this set V the other set's.....kulou

ken anderson...ne...1..... kulou dept.

martin collins 125/09/2020 15:38:26
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So i see, reason for asking is that our club seems to be having `interference issues` in two spots in the flight area, these are not always there and intermittent but have taken out half a dozen planes since the lock down was lifted, yes most of them were Spektrum BUT that is what the large majority at our site fly. The last one i saw was on Hitec TX/RX and it was in a bank that just continued into a roll and dove into field just outside our patch, there was no response from the tx. The remains worked fine once retrieved, it was not a stall, the plane was carrying a good turn of speed. I fly with a gen 1 DX9 and have done since they first came out and have (touch wood) never had any issues although i have found that it will not work with the latest generation of Lemon receivers, it binds but when switched on to use there is no connection to the tx, i tried re binding and have even bought a second one that behaved in the same manor. both were returned and money refunded as it was eventually put down to incompatibility with the gen 1, gen 2`s do work with them. I have taken up building my own models over the last 12 months and some of the scale ones have taken quite a bit of work and though i do say so myself look really nice, but with the recent problems i am reluctant to fly them in case i get `shot down`. I have been contemplating moving to a gen2 Spektrum and DSMX receivers over my DSM2 gear but someone who purports to know what he is talking about is telling me to buy either Futaba or Multiplex cockpit, he indoor flies in the winter and tells of multiple problems even on the new Spektrum gear. The price of the Multiplex and the cost of the rx`s is somewhat off putting as i have 20 flyable models which will mostly need new rx`s (i have about 5 on DSMX rx`s). So before i spend some money i thought i would hear what others had to say.

Denis Watkins25/09/2020 16:02:40
4650 forum posts
131 photos

Reading with interest

Round 2 of the Bashing thread

Don't get drawn in to " Interference Paranoia " Martin

As already stated, poor installation, chargers undercharging, and faulty "New " battery packs, all play their part.

Frank Skilbeck25/09/2020 16:21:00
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Martin, from your description it may not even be 2.4 ghz interference but some other high power electromagnetic "beam" which is swamping the receiver electronics and causing a lock out. Some receivers will be better at handling this than others, but then it's not down to the protocol used.

Did any of them have telemetry feedback telling them what the signal quality was like? My Jeti and MPX systems both have this and the only time I ever see drop to less than perfect is when I've landed a glider out of sight when I've gone back a bit to far on the hill when landing, so the ground is interrupting the line of sight blush But then again there are no cheap 3rd party receivers available for either of those systems.

FlyinBrian25/09/2020 17:56:23
677 forum posts
4 photos

I have one of the early JR DSX9 systems which used the Spektrum DSM2 protocol, it is now 11 years old, I have used JR Rxs, Spektrum Rxs and Orange Rxs all have been fine. No glitches or failures!

The only crash I suffered was due to the Rx battery going flat in the air which can not be blamed on the radio. I checked the voltage after the crash and the battery showed 4.2 volts with no load.

I have also been using a Futaba T14SG for almost 2 years with mainly Futaba rx but also a few FrSky rx. Again no issues at all.

Our club uses Futaba, FrSky, Hitec and Spektrum kit and all seem to perform well.

Ensure you install the equipment properly and use adequate capacity batteries and all modern kit works well.

Steve J25/09/2020 18:06:04
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Posted by martin collins 1 on 25/09/2020 15:38:26:

... I fly with a gen 1 DX9 ... I have been contemplating moving to a gen2 Spektrum and DSMX receivers over my DSM2 gear ...

As far as I am aware (and I have a DX9) there is no DX9G2. There are silver and black cases and the pre-2015 ones are dual protocol, but otherwise they are the same.

I haven't noticed any difference between DSM2 and DSMX.

Stephen Smith 1425/09/2020 18:46:45
237 forum posts
Posted by Ron Gray on 25/09/2020 12:54:23:

Simple logic says that if you want less risk of interference then move away from the congested 2.4GHz band, and move to 868MHz.

My jeti comes with 2x 2.4 transmissions plus a 868mhz back up if I add a rsat 900 to the receiver 

Edited By Stephen Smith 14 on 25/09/2020 18:47:30

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