FM transmitter kits

One of the first steps when building your own FM transmitter from modules will be the choice of exciter module. Below are a few typical scenarios that will help you decide.

Small community stations in remote areas, far from urban centers
STMAX3015+ works best for these since it comes with built-in stereo encoder and RDS. This reduces both cost and complexity. It can also be easily programmed via LCD without the need for PC to set the RDS parameters. You can mount one of these on the top of these amplifier modules, this will form a complete Stereo RDS FM transmitter. Audio quality is pretty good. Spurious level is not suitable for professional setups as DDS digital modulator creates some in-band artefacts about -50dBc down. If you’re looking for a simple solution where those issues are not a factor (remote rural area) do get one of these, you will not be disappointed.

Small community stations that require spurious levels to be >65dBc
If your signal needs to be clean but 15W is all you need, MAXPRO2015+ works best. You will also need a separate stereo encoder or audio processor with MPX output. The added benefit is that you can now also use MPX STL wireless link. MAXPRO2015+ can be used as a simple pallet amplifier driver.

Large stations that require spurious levels to be >65dBc
MAXPRO8015+ works best. You will also need a separate stereo encoder or audio processor with MPX output. You can also use MPX STL wireless link. It is equipped with DIGIAMP I interface and also supports MAXLINK II so when interfacing with SE8000 you don’t need to solder at all. Any of these can drive any amplifier up to 10KW and more.

Here is a quick comparison chart between different types of our FM exciters:

Name STR-1000 STMAX3000+ series MAXPRO2015+ MAXPRO7015+ series MAXPRO8015+ SB MAXPRO8015+ STR
Available today Available in June 2020 Yes Yes Yes Yes Yes
Frequency range 87,5-108 MHz (76-90MHz on request) 87,5-108 MHz (76-90MHz on request) 87,5-108 MHz (54-68 and 76-90MHz on request) 87,5-108 MHz (54-68 and 76-90MHz on request) 87,5-108 MHz (54-68 and 76-90MHz on request) 87,5-108 MHz (54-68 and 76-90MHz on request)
Output power 100mW 15W/25W/35W/50W/100W 15W 15W 15W, 25W 15W, 25W, 50W, 100W
Supply voltage 12-15V 12-15V (48V for 100W) 12-15V 12-15V 12-15V 12-15V
PLL step size 100 kHz (down to 1KHz on request) 100 kHz (down to 1KHz on request) 100 kHz (down to 50KHz on request) 100 kHz (down to 50KHz on request) 100 kHz (50KHz possible) 100 kHz (50KHz possible)
Antenna connector BNC BNC BNC BNC BNC MXC or SMA
Modulation type On-board 2xRCA, 2x XLR, USB and AES/EBU L/R input (2xRCA), with new ucoming input board also XLR, USB and AES/EBU Standard MPX input Standard MPX input Standard MPX Standard MPX, RCA, XLR inputs
VCO type DDS digital DDS digital Standard VCO + PLL Standard VCO + PLL Low noise VCO + PLL Low noise VCO + PLL
Spurious output ~-50dBc ~-50dBc <-65dBc <-75dBc <-83dBc <-85dBc
Built-in stereo encoder Yes Yes No, requires SE2000, SE5000 or SE8000 (SE7000 not supported) No, requires SE2000, SE5000, SE7000 or SE8000. SE8000 DSP+ recommended! No, requires SE2000, SE5000, SE8000 DSP+ recommended! Yes, high quality DSP
MAXLINK support Yes Yes Yes, MAXLINKI Yes, MAXLINKI Yes, MAXLINKII Not needed
Built-in RDS Yes Yes No, requires external No, requires external Same as 8015+ Plug-in available
What kind of STL link can be used Split audio channels only Split audio channels only MPX or regular split audio channels (with stereo encoder) MPX or regular split audio channels (with stereo encoder) MPX or regular split audio channels (with stereo encoder) MPX or regular split audio channels
Digiamp support No Yes No, but it has input for external power and swr Yes Yes Yes
RDS control Directly from LCD display or via PC application Directly from LCD display or via PC application Via PC aplication, requires RDS encoder Via PC aplication, requires RDS encoder Via PC aplication, requires RDS encoder Via PC aplication, requires RDS encoder
PC remote control CyberNanoFM+ program CyberNanoFM+ program CyberMaxFM+ program CyberMaxFM+ program CyberMaxFM+ program CyberMaxFM+ V60 program (more advanced than 8015SB)
Support for new large 4×16 LCD Yes Yes No Yes Yes Yes, new type with 16-lead cable
Super Bass: Yes Yes No No Yes Yes
Suitable for: Low cost Stereo + RDS solution, all functions including RDS adjustable from LCD display. For remote areas. Low cost Stereo + RDS solution, all functions including RDS adjustable from LCD display. For remote areas. Low cost solution with a clean signal Very clean signal for pro solutions, requires Stereo/RDS encoder Very clean signal for pro solutions, requires Stereo/RDS encoder Very clean signal for pro solutions, very practical all on single board

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