Description
AM transmitter with DSP processing, PWM modulator and DDS frequency generator
Based on the AMMAX8000 AM exciter this version has fixed power output. Unlike 2000W, 4000W and 8000W models this one has PWM modulation in exciter stage only which is followed by linear amplifier. For best efficiency and adjustable output power look at our new 2KW, 4KW and 8KW models.
While for many mentioning AM transmitters brings back childhood memories, these are actually still used widely in some countries. Besides, AM can be lots of fun to play with. Long wire antennas, different signal propagation (even worldwide), the nostalgia that comes packed with it… well, it is something very different in this modern age.
Our old AM MAX units sold out many years ago and for a long time we wanted to make a new AM transmitter, this time with different, more modern approach, with new better parts and better specs. And we finally did. It is equipped with DSP which makes it possible to control parameters of the audio chain, such as the compression, low pass audio filter cut frequency and pre-emphasis via convenient LCD with menu system. Other features, such as the fully solid state PWM modulator which ensures crisp audio, 125% positive peak modulation, compact form factor, plenty of audio input options and LCD display unit make AMMAX8000+ really something special in this modern age.
Manuals and drivers for most products are available under the Additional Information tab above, just under the prices. Some old manuals are here.
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Technical specifications:
– Peak RF Output Power 500W model: >500W
– Peak RF Output Power 1000W model: ~1000W
– Output connector: N female or 7/16 female
– Output Impedance: 50 Ohms
– Frequency Range (MW version): 530-2000KHz (specify frequency for best results)
– Frequency Range (SW version): 1-50MHz (Specify 3MHz segment), power may vary depending on frequency
– Frequency Range (shortwave version): 160m, 80m, 40m (other SW bands also available, please ask)
– PLL Steps: 1KHz
– Frequency stability: +/- 50Hz
– RF output: Harmonics: -50dB, Spurious: -70dB
– Power Supply 500W model: Mains 110V-240V/50-60Hz
– Power Supply 1000W model: Mains 110V-240V/50-60Hz
– Filter is adapted to your band for best performance
– Audio performance: compressor, low pass filter, limiter, treble, bass adjustment
– RF output ruggedness: > 2:1 VSWR
– Modulation: AM (CW input on-board. TTL 5V for disable)
– Size: 500W 2H rack
– Size: 1000W 2H rack
– Audio input: accepts either mono or stereo signal (transmission is mono)
– Audio connectors: XLR, RCA and USB audio input
– Modulation: AM, ~125% positive mod, PWM modulator
What parameters can I change via PC remote control?
Its best that you look at the screen capture below. Program runs on Windows computer. Requires USB cable or Ethernet (if option was purchased). The program may change over time as we make enhancements. Output power can only be set to full or zero. It is possible to program units to turn output on or off at certain hours. Requires connection with computer for this functionality.
If you require remote control via web interface have a look at our BE series AM transmitters, they have web interface and can turn on and off at desired time by themselves without connection to a computer.
Ethernet control + Barix IP audio + MP3 playout option?
– Barix instreamer with STL (Studio To Transmitter link) upgrade lets you play audio from remote IP audio streams via Ethernet or Internet. There is also automatic MP3 playback from USB that starts whenever there is no active IP stream. It can re-broadcast some online radio stations. It can be used to playback MP3 audio from USB key with included playlist. The Ethernet remote control part is not used here as the BE series has its own Ethernet interface in the front panel already. And regular series of AM transmitters does not have remote control.
Bazooka wire dipole antenna:
This is a very good solution with one major drawback, it is quite long. Some 95m long at 1500KHz. To erect such an antenna you will need several support points (poles) to hold it in place. Otherwise it can’t carry its own weight. Also, in the middle is antenna connector and this will need to be supported as well. So expect to need at least 5 support points/poles. This antenna can perform quite well. For best results consider planting a ground wire or several wires exactly below where the antenna is erected. Connect this ground to the antenna ground (coax shield).
Dimensions: wire dipole, more than 90m (1/2 wave) long depending on frequency, with connector in the middle
Bandwidth: >60 KHz (SWR below 2:1)
Radiation resistance: 50 OHMS
Connector: SO-239
Frequency: Specify at time of ordering
Maximum output power: 2000W CW
Weight: ~6Kg for 1800KHz
AA-35 ZOOM graphical antenna analyzer
This antenna analyzer can be used to tune your antenna for perfection. If there is one thing that makes a really huge difference with AM its the antenna system. This helps to ensure your antenna system is tuned.
AES/EBU digital input board
If your mixer features AES/EBU digital audio input and if you have ground loop issues it makes sense to install optional AES/EBU digital audio inputs. Another way to avoid ground loop problems is to use USB audio input; this can be done if your audio source is a PC computer.
AES/EBU digital audio input needs to be ordered at the time of ordering the transmitter (not later) as it needs to be installed in the factory.
What is MicroMPX IP stream receiver
MicroMPX is IP STL (studio-to-transmitter audio link) codec, specifically designed for FM radio but works fine also for AM. It doesn’t cause typical lossy codec artifacts (pre/post ringing, watery sound), and perfectly maintains peak control, even when using composite clipping. This eliminates the need to have an expensive high end audio processor at the transmitter site.
It transports audio to your transmitter via internet. As it is standard used by many FM radio stations you can now also use it for your AM translators. Stereo Tool software is needed in your studio to transmit the stream to your FM or AM transmitters.
Warning regarding using power meters:
– Most HAM SWR/Power meters will not work well for MW band. Even types that perform reasonably well at 160m will fail miserably at 530KHz or even 1500KHz for example. Sensitivity of directional couplers is very much frequency dependent and usually this means the needle is not even moving with power output actually at 100W peak. CB power meter won’t even deflect at 100W peak power at MW!
– With AM modulation peaks and using positive modulation in excess of 100% (this is done to make it sound louder and increase power efficiency) the carrier power with no audio applied will be less than ¼ of the peak power. So with no audio your power might be just 15W rising to 100W in peaks of modulation.
– The only way to accurately measure peak power (or any power at MW) is to use dedicated power meter or oscilloscope (you can calculate power from voltage and known load which is 50 ohms). Dedicated power meter needs to have peak power measuring capability and must cover the MW band.
CALL FOR FEEDBACK
Please e-mail us back and let us know what kind of antenna you’re using and how many Kilometers you were able to squeeze out of your transmitter. We had one report with ~20km with previous weaker version (about 50W peak).
What is included:
– CyberMaxAM+ transmitter in 2H rack
– Audio input board + AMMAX8000+ are installed inside
– Mains power supply is included inside as well
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