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Old 06-01-2021, 01:41 PM   #1 (permalink)
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Default Futaba R7008SB and R7108SB receivers

Hello all
I was looking at the R7108SB and R7008SB receivers on Futaba USA website.
To be honest, the website and lack of detail on their website is discouraging and I would think the manufactures website would give details on the receivers functions and intent, especially in visually looking at the receivers they look the same with different part numbers?
Does any of you Helifreak users know the differences in this two receivers?
Thanks
Boyd
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Old 06-01-2021, 02:52 PM   #2 (permalink)
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They've changed antennas. The new antennas offer a significantly higher gain over the old antennas. This is a quote from Flying Giants hope it helps:

It has been stated that nobody knows what the gain difference is between the old and new antennas. Well it is right in the FCC document for AZP-R7014SB-24G permissive change from the old to new antennas page 7, section 3.3:

The old antennas have a gain of -5.35 dBi
New antennas have a gain of +2.10 dBi

A change of 7.45 dBi is not a slight improvement. It is a huge improvement in a link budget.
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Old 06-01-2021, 10:16 PM   #3 (permalink)
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The 7108 also is able to do FASST if you want to use it
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Old 06-13-2021, 11:02 PM   #4 (permalink)
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Is the 7018SB a new version of the one discontinued a couple a years ago or just old stock ?
If it's anew version how to we recognize the new 7018SB from the old one causing issues?
I recall the 7018SB being sensitive to HV setup and browning out in flight !
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Old 06-13-2021, 11:52 PM   #5 (permalink)
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Quote:
Originally Posted by Flydynamics View Post
Is the 7018SB a new version of the one discontinued a couple a years ago or just old stock ?
If it's anew version how to we recognize the new 7018SB from the old one causing issues?
I recall the 7018SB being sensitive to HV setup and browning out in flight !

As far as I know there is not a "new" version of the 7018 out there. I've been using one since they came out, but I feed power to the servo bus like I've done for decades.

The 7014 is a new RX that has higher gain antennas and the ability to do both FASSTest and FASST. I'm using one in my Mamba70 biplane. Working great.
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Old 06-14-2021, 07:16 PM   #6 (permalink)
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Quote:
Originally Posted by Phaedrus View Post
As far as I know there is not a "new" version of the 7018 out there. I've been using one since they came out, but I feed power to the servo bus like I've done for decades.

The 7014 is a new RX that has higher gain antennas and the ability to do both FASSTest and FASST. I'm using one in my Mamba70 biplane. Working great.
Thank-you unless you use crazy power hungry servos I know the 7018SB is fine, I was just wondering about what have had been done to the 7018SB.
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Old 06-14-2021, 11:40 PM   #7 (permalink)
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Just curious, where are you seeing a 7018??
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Old 06-15-2021, 08:47 AM   #8 (permalink)
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Quote:
Originally Posted by Phaedrus View Post
Just curious, where are you seeing a 7018??
7018SB comes with the new 16IZ transmitter and is still sold by many retailers included Futaba USA.
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Old 06-15-2021, 10:20 PM   #9 (permalink)
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Quote:
Originally Posted by Flydynamics View Post
7018SB comes with the new 16IZ transmitter and is still sold by many retailers included Futaba USA.
That is incorrect. The R7108SB comes with the 16IZ.
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Old 06-16-2021, 10:15 AM   #10 (permalink)
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Quote:
Originally Posted by Phaedrus View Post
That is incorrect. The R7108SB comes with the 16IZ.
I see, sorry 7108SB with a R in front of it yes.
A friend of mine lost a pattern plane with this receiver so I was wondering if the R7108SB had seen an update, answer is no so I'm happy I got my 16IZ without it and I'll just stay away from this Rx!
Thanks for enlightening me on this, subject close for me!
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Old 06-16-2021, 10:01 PM   #11 (permalink)
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Quote:
Originally Posted by Flydynamics View Post
I see, sorry 7108SB with a R in front of it yes.
A friend of mine lost a pattern plane with this receiver so I was wondering if the R7108SB had seen an update, answer is no so I'm happy I got my 16IZ without it and I'll just stay away from this Rx!
Thanks for enlightening me on this, subject close for me!
You kept referring to a 7018. The=at is different from the 7108, with or without the "R".
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Old 06-17-2021, 10:36 AM   #12 (permalink)
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Quote:
Originally Posted by Phaedrus View Post
You kept referring to a 7018. The=at is different from the 7108, with or without the "R".
You're right, I didn't identify the Rx properly in my earlier posts
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Old 01-06-2022, 08:14 AM   #13 (permalink)
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Does anyone know why the new receivers with higher gain antennas have been introduced by Futaba. Anything to do with EU regulations which I seem to recall required a reduction in ERP from 100mW to 25mW?
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Old 01-06-2022, 12:26 PM   #14 (permalink)
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Post #2 is a quote from me.

The dirty little secret is that our TX's have seldom had 100 mW output. The FCC test documents tell the tale. Futaba transmitters have tested from 20 to 50 mW for years. My TM14 module in my 12Z was 7 dB below my XG14 in output. 3.01 dB is half power. SO assuming that the XG14 is legal and 100 mW, the TM14 was only 19.95 mW.

I tested every transmitter at my field for several days with a cheap hand held spectrum analyzer. It gives an accurate relative measurement of power output. Transmitters varied by about 30 dB. Some were defective ! A bunch of DX9's and all of the Futaba were about 20 mW. One DX8 and my XG14 were the most powerful.

Should you be concerned that your transmitter is 20 mW. Well no you should not. When I was working a WiFi adapter was 1 mW and a LONG RANGE WiFi was 5 mW.

The range test power down of transmitters varies a lot. The Futaba TM14 was 23 dB down but the XG14 is 35 dB down from full power. That's a bunch. So comparing range between brands in range test mode means nothing.

I range tested my 12Z/TM14 20 mW transmitter in power down mode. I got 600 feet. That gives a range in full power (assuming inverse square effect) of 14x600 = 8400 feet. I can't see that far! And that was with the old antennas.

Antenna gain does not translate into range improvement. It is more complicated than that. But it probably helps. The new antennas are difficult to mount in a helicopter canopy !
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Old 01-06-2022, 10:50 PM   #15 (permalink)
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Quote:
Originally Posted by Four Stroker View Post
The new antennas are difficult to mount in a helicopter canopy !
I had to get some larger diameter plastic tubes when I swapped out the 7008 for the 7108
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