C-QUAM Stereo AM Transmitter ASMAX2 FREE SHIPPING

Description

*** NON-BUSINESS EU BUYERS ARE REQUIRED TO PAY 24% EXTRA FOR VAT ***
*** HUGE DELAYS (ONE MONTH+) HAVE BEEN NOTED FOR USA AND OTHER DESTINATIONS DUE TO CV19 ***
ASMAX2 is a CQUAM Stereo, or Mono capable AM Medium Wave DDS-based (better than PLL stability) radio broadcast transmitter board for educational or similar use that offers great audio quality, 1 KHz frequency step selection (for both 10 KHz US and 9 KHz EU steps) using only four keys. You connect left-and-right audio and send it wirelessly using a whip antenna, distance varies with surrounding conditions, RF PEP output 100 mW [according to US FCC Part 15.219] or 600 mW PEP [EU] (at 50 Ohm) maximum over the entire band. FULL BROADBAND DESIGN, no variable caps to adjust! RF power adjustment is done via the keypad (no trimmer). Reception is either on a regular AM radio (mono) or a stereo C-QUAM radio set anywhere from 530 KHz to 1700 KHz (special model available for 510-2000 KHz covering 160 m band).
It has two independently adjustable audio inputs, for Left and Right channels with modified 50 usec or 75 usec pre-emphasis and low-pass filtering (depending on country).
You can change the broadcast frequency, stereo/mono mode, and other functions using the settings menu. After ENTER is pressed the DDS is re-programmed with the new transmission frequency. The power-on frequency and all other settings are saved to the built-in non-volatile memory when exiting the settings menu.
ASMAX2 is an upgraded version of the older ASMAX1 with several enhancements and improvements, some of them being: better stereo separation up to 40 db, clearer audio and RF signal, left-and-right mono audio component output to drive a high-level modulator circuit (if needed), RS232 TTL level port (TX, GND, RX) for complete configuration of all parameters from a PC terminal. To do so, you need either an RS232 level translator adapter, or even a USB-to-RS232 converter. You can also use an optional external Ethernet module to connect it to the Internet for remote management from anywhere in the world.
One important enhancement is that on the LCD you can see the real-time modulation percentage and bar-graph, giving you the possibility to correctly adjust the final modulation of the transmitter to keep it within specs, and avoid over-modulation peaks that may lead to distortion.
The unit meets all FCC Part-15 requirements for AM transmitters. It has an excellent spectral purity with harmonics rejection better than -50 dBc (upper half band) as can be seen in a Spectrum Analyzer, out-of-band spurious output better than -60 dBc, and accuracy of the lock-on frequency better than +/- 0.5 Hz. You can manually turn the RF output on/off, or use the built-in real-time clock to set a daily or weekend schedule for automatic on/off at a specific time. With this option, one can leave the unit at a remote site and have it operate only for the specified hours.
A C-QUAM Stereo encoding system is built-in and provides crystal clear audio up to 15 KHz and with a channel separation of up to 40 dB. Optionally, stereo encoding can be de-activated via a menu selection in case you need to use the device as a Mono AM transmitter.
The board is also capable (as an option) of DRM transmission by selecting the appropriate mode and using appropriate (PC) software for the independent I and Q base band encoded signal.  For more info, please contact us.
The device requires 13.8 V DC (USA model for FCC compliance), 24 V (EU/International model) @350 mA maximum.
WARNING: Do not use the wrong supply for the model you choose.  It will either not work correctly, or damage the unit.
Power supply, keypad, or interconnection cables are NOT included.  You get only what you see in the photo.
Disclaimer: Although this unit meets FCC Part 15 requirements for AM transmitters, this does not imply it has been FCC certified.
Available as board with 4x20 LCD.
IMPORTANT: EU residents without a business Tax ID must pay an additional 24% VAT to their total.
NO RETURNS ACCEPTED