Apache Labs ANDROMEDA ANAN-7000DLE MKII, User Manual

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Minimized Latency:
In Software Defined Radio’s, filtering usually contributes the most latency. There are two reasons; (1) large
sets of samples, “buffers”, are normally collected before executing the filters so that efficient FFT algorithms can
be used, and (2) sharp “brick-wall” linear-phase filters inherently have long latency, no matter how cleverly they
are implemented. Both these issues have been addressed and conquered in the ANAN-7000DLE MKII
Transceiver. Small “buffers”, requiring little collection time, can now be used even while retaining the very
sharp “brick-wall” filters. In addition, the option of using very low-latency “minimum-phase” filters is provided.
In almost all situations, laboratory and on-air testing have demonstrated no discernible difference in
performance between linear-phase and minimum-phase filters. With filters as sharp as you desire, sub-20ms
receive latencies are now possible, compared to the best of conventional DSP radio’s and must better than
competing Software Defined Radio’s.
Two Phase Synchronous ADCs
ANAN-7000DLE MKII includes two phase synchronous front ADC’s to enable Diversity reception and other
advanced applications. The Transmit chain is designed keeping in mind the unique “PureSignal” Linearization
and pre-distortion.
PureSignal Pre-Distortion:
There is no truly Linear RF amplifier. The Non-linearity in an amplifier shows up as Intermodulation Distortion
(IMD) Wikipedia reference: https://en.wikipedia.org/wiki/Intermodulation within and outside the transmitted
bandwidth. There are many challenges to reduce IMD, hence, most manufacturers of Amateur Radio Equipment
do not specify their IMD, or use inefficient Class-A options that lower IMD at the expense of power. The ANAN-
7000DLE MKII was designed with the unique PureSignal Linearization (Pre-Distortion) to achieve an astounding -
68dBm IMD on 20M at full 100W output. This achievement in design is an improvement of at least 25 to 30dB
or approximately 1000 times lower distortion than conventional “Class-C” capable flagship transceivers.
Copyright Apache Labs © page 9 26 February 2019