1 watt 433mhz - 2.4ghz rf amp... from SCRATCH! - Page 6 - RC Groups
Thread Tools
Nov 22, 2013, 01:29 PM
RC beginner
yes, as mentioned in post #69. im going to put up more details on my 2.4ghz version so we can see exactly whats involved.
Sign up now
to remove ads between posts
Apr 02, 2014, 10:56 PM
Did you ever get around to taking some photos of the 2.4ghz version? Looks like this could be good to get a bit more range out of the diyFlysky rx.
Apr 04, 2014, 09:47 AM
RC beginner
i will try to get some pics and more info on the 2.4ghz version but remember rx need LNA to increase range not power amp. preamp and antenna upgrade are not only more effective but cheaper and actually legal. ive made considerable progress in that area recently so really need to get a thread going for it. problem is my other project threads here just refuse to die off like they are supposed to. BAD project threads... no tv for you tonight!
Apr 04, 2014, 11:29 AM
Stuart
srnet's Avatar
Quote:
Originally Posted by dave1993
i will try to get some pics and more info on the 2.4ghz version but remember rx need LNA to increase range not power amp. preamp and antenna upgrade are not only more effective but cheaper and actually legal. ive made considerable progress in that area recently so really need to get a thread going for it. problem is my other project threads here just refuse to die off like they are supposed to. BAD project threads... no tv for you tonight!
A good LNA can make a big difference to reception of telemetry from RFM22B type transmitters.

Using a standard RFM22B as the receiver with an LNA and just an Omni directional antenna (QF Helix - minimal gain), I have been able to receive telemetry packets from $50SAT (100mW only TX) at between 600-900km, which ain't half bad.
Apr 04, 2014, 12:24 PM
Very cool. I understand that antennas and LNA's are a better route, but I just like building and playing with stuff. Not for anything serious.

Please do make another thread on those subjects and also post a bit of info here! It would be greatly appreciated!
Jun 27, 2017, 08:03 PM
Registered User
Can this rf2126 be use in a 2.4ghz vtx?
Also if use in rfm22b will it be comparable to rfm23bp?
How much should be the input power,any limit?can not find any details for the input power.

Thanks
Jul 17, 2017, 12:48 AM
Registered User
vollrathd's Avatar
Question
Is this legal in the USA for our RC transmitters? For me, I'd prefer that no one in my club uses one of these while I'm flying any of my models.
Jul 18, 2017, 01:46 AM
Stuart
srnet's Avatar
Quote:
Originally Posted by vollrathd
Question
Is this legal in the USA for our RC transmitters? For me, I'd prefer that no one in my club uses one of these while I'm flying any of my models.
Even ignoring legalities, the is the obvious issue that the amplifiier is quite capable of producing significant harmonic interferance, in particular when overdriven.

Of course this type of device is normally built and tested by people who understand such things and have the equipment to check that the amplifier is not causing interfernce to other users of the RF spectrum such as aircraft navigation systems the emergency services etc.
Jul 18, 2017, 01:20 PM
Registered User
vollrathd's Avatar
Quote:
Originally Posted by srnet
Even ignoring legalities, the is the obvious issue that the amplifiier is quite capable of producing significant harmonic interferance, in particular when overdriven.

Of course this type of device is normally built and tested by people who understand such things and have the equipment to check that the amplifier is not causing interfernce to other users of the RF spectrum such as aircraft navigation systems the emergency services etc.
This sort of illegal amplifier thing also hit the CB radios of some years back.


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
For Sale 2.4gHz 1 watt Video Transmitter and Receiver W4HFV FPV Equipment (FS/W) 1 Jul 04, 2013 03:07 PM
Sold Lawmate 2.4Ghz 1 Watt Tx Mat Holliday FPV Equipment (FS/W) 2 Jul 03, 2013 04:47 PM
Discussion Help! Need Encoder & Decoder for 433Mhz RF djsong121 DIY Electronics 3 Apr 22, 2013 09:10 PM
NIB turnigy 9XR with FRsky telem and RX plus LONG RANGE 2 watt AMP 2.4ghz joegermano1 Non R/C Items (FS/W) 0 Mar 17, 2013 03:52 AM
For Sale 1 Watt 2.4Ghz Booster (3s lipo) w/ Attn pad, High gain Ant -- MUST SEE SELLING CHEAP mmalik4 FPV Equipment (FS/W) 3 Jan 04, 2013 11:23 PM