DSMX or DMSS Preference
01-07-2016, 08:55 PM
#27
Roger
My A10 is currently going to DMSS with JR 28X. I flew the radio at Nall last year with my dle 111 Sbach342 all xbus servos and Infinity rx. Also my Ziroli P51 and several other planes. Sold all my Spectrum equipment a year ago. The DMSS and xbus system allows everything from the simplest to most elaborate power and data set up. A 4 foot extension to 500 oz torque servos needs the voltage. I'm using the B2 hub with heavy duty deans lead
My A10 is currently going to DMSS with JR 28X. I flew the radio at Nall last year with my dle 111 Sbach342 all xbus servos and Infinity rx. Also my Ziroli P51 and several other planes. Sold all my Spectrum equipment a year ago. The DMSS and xbus system allows everything from the simplest to most elaborate power and data set up. A 4 foot extension to 500 oz torque servos needs the voltage. I'm using the B2 hub with heavy duty deans lead
01-08-2016, 01:35 AM
#28
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There is a function on the chip that would allow the chip to boost its input voltage to ride out brownouts much better.
The vendor explicitly states that if this function is not used the relevant output pin MUST be grounded and not left "floating" ie unconnected.
Well floating it is on spek's where it acts as a source of poor power regulation and a random input of RF and EMI to the RF subsystem.
Ironically some of the clones do have this properly grounded.
Its not my opinion but that of the chips vendor technical department application engineers as confirmed to me when I raised a query about this.
You should check with Spek if they have since corrected this when I pointed it out some 5 years ago.
Its a ridiculously easy fix to do.
As the mfr will tell you the fail mechanism is unpredictable but will certainly cause the RF chip to brown out randomly, depending on the environment it finds itself.
But I suspect it also degrades the RF link in some way regardless of power conditions.
Its perfectly OK for a foamy I would think...
01-08-2016, 06:26 AM
#29
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To the OP, take a look at Futaba or Jeti. Both have very solid links but I think the Jeti systems are ahead of all others in terms of programming flexibility and telemetry.
01-08-2016, 10:47 AM
#31
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The RF chip used was originally intended for low power devices like keyboards and mice. It was marketed as "wireless usb".
There is a function on the chip that would allow the chip to boost its input voltage to ride out brownouts much better.
The vendor explicitly states that if this function is not used the relevant output pin MUST be grounded and not left "floating" ie unconnected.
Well floating it is on spek's where it acts as a source of poor power regulation and a random input of RF and EMI to the RF subsystem.
Ironically some of the clones do have this properly grounded.
Its not my opinion but that of the chips vendor technical department application engineers as confirmed to me when I raised a query about this.
You should check with Spek if they have since corrected this when I pointed it out some 5 years ago.
Its a ridiculously easy fix to do.
As the mfr will tell you the fail mechanism is unpredictable but will certainly cause the RF chip to brown out randomly, depending on the environment it finds itself.
But I suspect it also degrades the RF link in some way regardless of power conditions.
Its perfectly OK for a foamy I would think...
There is a function on the chip that would allow the chip to boost its input voltage to ride out brownouts much better.
The vendor explicitly states that if this function is not used the relevant output pin MUST be grounded and not left "floating" ie unconnected.
Well floating it is on spek's where it acts as a source of poor power regulation and a random input of RF and EMI to the RF subsystem.
Ironically some of the clones do have this properly grounded.
Its not my opinion but that of the chips vendor technical department application engineers as confirmed to me when I raised a query about this.
You should check with Spek if they have since corrected this when I pointed it out some 5 years ago.
Its a ridiculously easy fix to do.
As the mfr will tell you the fail mechanism is unpredictable but will certainly cause the RF chip to brown out randomly, depending on the environment it finds itself.
But I suspect it also degrades the RF link in some way regardless of power conditions.
Its perfectly OK for a foamy I would think...
01-08-2016, 01:54 PM
#32
Roger,
You know I went through the same journey a couple years ago.. I ended up studying DMSS, and ultimately selected Jeti. But there were other things that attracted me like being able to update the receivers and telemetry options, along with the turbine telemetry, and the cool programming options..
FWIW, Im now biased, but if I were looking for a new radio today, I would look at the DC-24 tray with the 900 MHz backup channel, or hold out for the Debut of the DS-24 radio in the fall of 2016. By the way, current Jeti Owners of DC/DS16 radios got a free upgrade to 24 channels with version 4 just released.
I purchased TWO Transmitters, and radio equipment on my own at retail, before joining with Jeti USA, ..
now back to the dungeon..
You know I went through the same journey a couple years ago.. I ended up studying DMSS, and ultimately selected Jeti. But there were other things that attracted me like being able to update the receivers and telemetry options, along with the turbine telemetry, and the cool programming options..
FWIW, Im now biased, but if I were looking for a new radio today, I would look at the DC-24 tray with the 900 MHz backup channel, or hold out for the Debut of the DS-24 radio in the fall of 2016. By the way, current Jeti Owners of DC/DS16 radios got a free upgrade to 24 channels with version 4 just released.
I purchased TWO Transmitters, and radio equipment on my own at retail, before joining with Jeti USA, ..
now back to the dungeon..
Last edited by gooseF22; 01-08-2016 at 01:56 PM.
01-08-2016, 11:26 PM
#33
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The ground is the traces connected to the neg battery side or brown/black lead of the servos.
The chip has a feature called PMU. Look in below doc and look at description of pin 37.
On my units the pin 36 was connected to GND as dictated by the datasheet.
So it could just be a matter of soldering the 2 pins together....
http://www.cypress.com/documentation...ical_documents
In addition, the CYRF6936 IC has a Power Management Unit
(PMU), which enables direct connection of the device to any
battery voltage in the range 1.8 V to 3.6 V. The PMU conditions
the battery voltage to provide the supply voltages required by the
device, and may supply external devices.
01-11-2016, 06:18 PM
#36
Roger, I am sorry for your loss.
Unexplainable crashes leave such an unpleasant taste.
I am approaching a similar situation. The difference is that I am still running dsm2 with my 12x-mv. I do not like to mess with radio changes. My radio's (JR baby!) have been good to me and pretty much most of my crashes have been due to pilot error/brain ejection.
There is just no way I would send in my 12xmv for the "upgrade" to dsmx in 2011 and there certainly would be no way I would use the spektrum 12 channel rx. It is my innate belief in the sage axiom "the enemy of good is better". And I would venture to bet, most would agree that spektrum would usually not be seen as an upgrade to JR.
What has been done is done. We can no longer buy JR1221 rx's so I will no longer be using my trusty and beloved 12xmv after my next jet. I have one last, brand new JR 1221 in a box.
As for more of my unsolicited editorial on radio choices, after my own research, limited as it is, if I had to buy a new radio this instant, it would be the Jeti-16. It uses a frequency hoping model. If you can wait until later this year, Jeti "says" it will have the DS-24.
Unexplainable crashes leave such an unpleasant taste.
I am approaching a similar situation. The difference is that I am still running dsm2 with my 12x-mv. I do not like to mess with radio changes. My radio's (JR baby!) have been good to me and pretty much most of my crashes have been due to pilot error/brain ejection.
There is just no way I would send in my 12xmv for the "upgrade" to dsmx in 2011 and there certainly would be no way I would use the spektrum 12 channel rx. It is my innate belief in the sage axiom "the enemy of good is better". And I would venture to bet, most would agree that spektrum would usually not be seen as an upgrade to JR.
What has been done is done. We can no longer buy JR1221 rx's so I will no longer be using my trusty and beloved 12xmv after my next jet. I have one last, brand new JR 1221 in a box.
As for more of my unsolicited editorial on radio choices, after my own research, limited as it is, if I had to buy a new radio this instant, it would be the Jeti-16. It uses a frequency hoping model. If you can wait until later this year, Jeti "says" it will have the DS-24.
01-21-2016, 12:14 PM
#37
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At last, I am beyond the initial trauma of losing my MIBO A-10. Thanks you for your comments and
concerns regarding the particulars surrounding the unfortunate event.
Although there are those pilots with a number of consistently good flights (i.e. glitch free) with the DSM protocol
I believe it is merely the proverbial accident waiting to happen-not if, but when.
Therefore, my attention must focus on the future since I harbor significant doubts relative to the reliability of DSM products
I cannot knowingly contribute what in my opinion would be unwarranted additional risk in our already exceedingly high risk hobby.
Cheers & Good Sorties to Everyone, Roger
concerns regarding the particulars surrounding the unfortunate event.
Although there are those pilots with a number of consistently good flights (i.e. glitch free) with the DSM protocol
I believe it is merely the proverbial accident waiting to happen-not if, but when.
Therefore, my attention must focus on the future since I harbor significant doubts relative to the reliability of DSM products
I cannot knowingly contribute what in my opinion would be unwarranted additional risk in our already exceedingly high risk hobby.
Cheers & Good Sorties to Everyone, Roger
Last edited by Roger Shipley; 01-21-2016 at 12:17 PM.
