TCR-1002 HF RECEIVER
Rev. A
– 6/4/2012
6
SECTION 2: INTRODUCTION
2.0 INTRODUCTION
The TCR1002 HF Receiver operates in the AM, FM, CW, LSB, and USB modes across the
500 kHz – 30 MHz frequency range. Demodulated audio is available at a front panel speaker.
An audio phone jack is also available for monitoring by a dedicated operator.
2.1 GENERAL DESCRIPTION
The TCR-1002 HF Receiver has state of the art DSP type architecture. This allows both high
performance and flexibility due to most of the parameters being defined in the program, not by
hardware. The RF chain contains minimal analog circuitry compared to traditional super
heterodyne configurations, and the entire range of the receiver is digitized early in the signal
path. There are no mixers or intermediate frequency (IF) conversion. A/D conversion
encompasses the entire 500 kHz to 30 MHz range simultaneously. This eliminates "birdies"
and images that are often found in super heterodyne receivers. The tuning, bandwidth,
detection, noise reduction and audio processing are all done digitally. See
Figure 1
.
2.2 USE WITH SPECTRUM ENTERPRISE*
This version of the TCR-10XX family is programmed to emulate the Ten-Tec RX-340**, in
regards to use of the serial communication port. The TCR-1002 does not use the full RX-340
command set. This configuration allows the TCR-1002 to be used with Spectrum Enterprise,
as configured for the RX-340.
* Spectrum Enterprise is a Trade Mark of Signal Intelligence Inc., San Jose, CA
**The RX-340 is manufactured by Ten-Tec, Sevierville, TN
2.3 SIGNAL PATH
The signal is brought in via a SO-239 (UHF) connector. The connector has a built-in lightning
arrestor with a replaceable gas cartridge. In the event of a strike, the cartridge will discharge
most of the energy to ground. The failure mode is short-to-ground, and the element can be
easily replaced without any special tools if this occurs.
The signal is then routed to the band-pass filter circuit. One of 8 filters is selected, depending
on the frequency. The filters are ½-octave (except the lowest, entirely in the AM BCB) to
ensure that harmonics are not introduced to the A/D converter. The filter ranges are:
500 kHz to 1.44 MHz 7.50 MHz to 10.40 MHz 1.44 MHz to 2.44 MHz
10.40 MHz to 14.30 MHz 2.44 MHz to 3.60 MHz 14.30 MHz to 20.24 MHz
3.6 MHz to 7.5 MHz 20.24 MHz to 30.00 MHz
The filters are followed by a pre-amplifier and attenuator that can be manually turned on or off
or left on AUTO for management by the AGC circuit. AUTO is the recommended setting for
most situations.
