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Spektrum AR620

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Simon Feather11/12/2018 09:47:23
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231 forum posts
167 photos

Hi there, has anyone tried one of these new internal-antenna Spektrum receivers yet?

I picked one up yesterday from Leeds Models. Clearly with the antenna purely inside the case there is a possibility of signal blockage if there are large lumps of metal or batteries up front. It claims to be full-range, and presumably Spektrum have tested stuff like that...

I've not tried mine yet, but will do lots of ground based range checks before I risk flying it, and will report back with my findings

Simon

Paul C.11/12/2018 09:57:28
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577 forum posts
139 photos

Interested to hear your thoughts on this one, looks like a genuine receiver at a good price. Hope it performs ok, might be tempted myself.

Paul.

Denis Watkins11/12/2018 10:08:09
3746 forum posts
179 photos

What Spekrum have done Simon, is to negate installation problems

Antenna work at the tip of the wire at that wavelength

What Spektrum have done is to fix this point within the case

It will have been tested " up hill and down dale "

Always give any 2.4 gig Rx the best chance, ventilated, not double wrapped, firmly fixed, not on one sticky pad on the side of the fuz, and with good power pack, and it will do its job

Nigel R11/12/2018 10:53:49
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2935 forum posts
470 photos

" Clearly with the antenna purely inside the case there is a possibility of signal blockage"

No more or less than with the wire poking out.

Only about one inch of the aerial, the tip, as Denis says, has any effect or use, for 2.4GHz.

Keep it a short distance away from the lipo as before, all will be well.

" ventilated, not double wrapped"

Not sure of the logic behind this statement Denis, foam wrap and airflow will make no odds to the RX?

Stuart Z11/12/2018 11:44:01
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370 forum posts

I think RCME are testing one of these and will report back in the mag according to the last mag I saw.

S

Denis Watkins11/12/2018 11:59:53
3746 forum posts
179 photos
Posted by Nigel R on 11/12/2018 10:53:49:

" Clearly with the antenna purely inside the case there is a possibility of signal blockage"

No more or less than with the wire poking out.

Only about one inch of the aerial, the tip, as Denis says, has any effect or use, for 2.4GHz.

Keep it a short distance away from the lipo as before, all will be well.

" ventilated, not double wrapped"

Not sure of the logic behind this statement Denis, foam wrap and airflow will make no odds to the RX?

Thanks Nigel

With Spektrum, and Futaba, from the onset, maybe not so much these days

Neither Company liked the Rx deeply embedded in foam due to heat

I think this is long forgotten, but find early installation instructions and you will see it

From then until now, I just mount an anti vibration pad to the area, then a thin acetate surface UHU glue to the pad

Then a double sided mount tape on the Rx, leaving it in fresh air

This is just habit that I carried on doing

Nigel R11/12/2018 12:06:08
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2935 forum posts
470 photos

Ok, understand now, thanks Denis.

 

There is a long and interesting discussion on the big US forum about these RXs.

Seems they represent something of a leap in the technology with the PCB aerial being very tightly matched to the onboard CPU/RX chip; giving more range than previous generation AR400/610 implementation. Presumably we can expect the internal antenna to filter into the satellite RXs, and the main RX bodies for rest of range, in the future.

Also, news to me, they have basic telemetry built in, let us know how that works out.

Edited By Nigel R on 11/12/2018 12:07:20

Cuban811/12/2018 12:26:33
2581 forum posts
12 photos

A link please, to the US forum's discussion. Thanks.

Steve J11/12/2018 13:18:59
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1241 forum posts
40 photos

There is a discussion thread on RCG's Radio forum.

I see the AR410 and 620 as being receivers for foamies. They don't have X-Bus or flight pack voltage connections, so the only telemetry that you are going to get is signal and receiver voltage. I suspect that a driver for these is the same one as for fixed antennas on transmitters - users break flexible antennas.

I have a number of ESP8266 boards that I use for environmental monitoring in my garage and shed. Some have a whisker antenna and some have an antenna track on the circuit board. There isn't much difference in the RSSI, but I would say that that the whiskers are slightly better.

Steve

Steve J11/12/2018 13:25:57
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1241 forum posts
40 photos
Posted by Nigel R on 11/12/2018 12:06:08:

Presumably we can expect the internal antenna to filter into the satellite RXs

The two new remotes (9745 & 9746, due February) have conventional antennas.

Steve

Nigel R11/12/2018 13:52:31
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2935 forum posts
470 photos

"I see the AR410 and 620 as being receivers for foamies."

Don't know why - they're "sport" receivers which seem perfectly well suited up to typical "club size" wood models. Personally I'd be quite happy to run the them in 40 or 60 size models, the telemetry - flight pack voltage and RX signal - would work just fine for an IC.

I admit it makes little sense to disallow the use of a main lipo voltage sensor though. Seems you need to spend out on a 6600T to get that, or get an add on telemetry unit.

edit - Bit surprised about the new satellites going with external aerials now, maybe the layout/design wasn't ready in time.

 

RCGroups link - https://www.rcgroups.com/forums/showthread.php?3123939-New-Antennaless-AR410-and-AR620

 

Edited By Nigel R on 11/12/2018 13:53:18

Edited By Nigel R on 11/12/2018 13:54:03

Steve J11/12/2018 14:33:40
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1241 forum posts
40 photos

I wouldn't use a Spektrum receiver without a remote in a model with an engine. I appreciate the fact that lots of people do.

Looking at the photos in the FCC submission, it looks like there are pads on the AR620's circuit board for a whisker antenna (marked A2) so somebody with the right tools and a steady hand might be able to convert one to a whisker if they were minded to do so.

Steve

edit: removed reference to u.fl connector as the pads don't look right for one.

Edited By Steve J on 11/12/2018 14:50:16

Don Fry11/12/2018 16:19:31
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3735 forum posts
42 photos
Posted by Steve J on 11/12/2018 14:33:40:

I wouldn't use a Spektrum receiver without a remote in a model with an engine. I appreciate the fact that lots of people do.

Looking at the photos in the FCC submission, it looks like there are pads on the AR620's circuit board for a whisker antenna (marked A2) so somebody with the right tools and a steady hand might be able to convert one to a whisker if they were minded to do so.

Steve

edit: removed reference to u.fl connector as the pads don't look right for one.

Edited By Steve J on 11/12/2018 14:50:16

Why not?

gangster11/12/2018 16:24:43
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929 forum posts
16 photos

Could be a step in the right direction

There seems to be all sorts of old wives tales as to the directions 2.4 rx aerials should point and I have seen some brutal treatment to achieve this I have also seen some scarilit damaged ones Integral TX aerials dont seem a bad idea either. Certainly work ok on Futaba

Steve J11/12/2018 16:57:54
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1241 forum posts
40 photos
Posted by Don Fry on 11/12/2018 16:19:31:
Posted by Steve J on 11/12/2018 14:33:40:

I wouldn't use a Spektrum receiver without a remote in a model with an engine.

Why not?

Assuming that your question relates to the first sentence of my 14:33 post, because Spektrum is direct sequence spread spectrum at a wavelength of 12cm.

Steve

Glenn Philbrick11/12/2018 17:05:56
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225 forum posts
59 photos

Been using one of these in an IC model for a couple of weeks now. Read the thread on RCgroups first as they have been available in US for some time. Range quoted as better than normal, I have checked mine to quite a distance and it remained working until I was not prepared to walk any further. So easy to set up and fits nicely without having to worry about aerial positioning or damage. Rumour has it that there might be a eight channel one on its way. So far in my experience I would not hesitate to buy another.

Don Fry11/12/2018 17:11:36
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3735 forum posts
42 photos
Posted by Steve J on 11/12/2018 16:57:54:
Posted by Don Fry on 11/12/2018 16:19:31:
Posted by Steve J on 11/12/2018 14:33:40:

I wouldn't use a Spektrum receiver without a remote in a model with an engine.

Why not?

Assuming that your question relates to the first sentence of my 14:33 post, because Spektrum is direct sequence spread spectrum at a wavelength of 12cm.

Steve

Sorry, my query is a bit abtuse. You have given me an answer, but it is no use to me as I don't understand the terminology. Why is it Ok in an electric model, and not in a model with an engine? Curious.

Steve J11/12/2018 17:42:35
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1241 forum posts
40 photos
Posted by Don Fry on 11/12/2018 17:11:36:
Posted by Steve J on 11/12/2018 16:57:54:
Posted by Don Fry on 11/12/2018 16:19:31:
Posted by Steve J on 11/12/2018 14:33:40:

I wouldn't use a Spektrum receiver without a remote in a model with an engine.

Why not?

Assuming that your question relates to the first sentence of my 14:33 post, because Spektrum is direct sequence spread spectrum at a wavelength of 12cm.

You have given me an answer, but it is no use to me as I don't understand the terminology. Why is it Ok in an electric model, and not in a model with an engine?

Sorry. I wouldn't use a Spektrum receiver that didn't have a remote (or at the very least antenna diversity) in a model with metallic bits larger than 12cm. I bend this rule a bit with low energy electrics, but I wouldn't with an I/C. I appreciate that other people do so without appearing to have any problems.

I know that I am a bit OTT with my receiver installations, but I have had no problems in eleven years of using Spektrum that I would put down to either protocol or power issues (I have had a couple caused by faulty receivers).

Steve

Don Fry11/12/2018 18:28:14
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3735 forum posts
42 photos

Thanks, I think I understand that. I am, mostly, a engine user, and always assumed the lump was fairly benign.

Nigel R11/12/2018 20:20:14
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2935 forum posts
470 photos
Are these not dual antenna?

Are the previous gen 400 and 610 not dual antenna?

I'm missing something.

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