Technical data

The TRC-394A is the CSF reference for an HF solid-state receveir used by the french army but also aboard french vessels. This model has been designed around 1978.

Here are its technical specifications (detailed specifications here):
- Receiving mode:
AM,USB,LSB,CW,TTY (ISB optional) - Sensivity: [for (S+B)/B = 10dB]
<0.4uV BLU, <2.5uV AM. - Frequency coverage:
Continuous 10Hz tunable from 400Khz to 30Mhz - Double conversion design:
1st FI: 67.5MHz, 2nd FI: 1.5Mhz. - Filters:
3Khz AM,USB,LSB, 1Khz F1, 3Khz, 250Hz A1 (800Hz optional). - BFO:
1Khz Fixed, Tunable from 500 to 2000Hz.
This receiver uses CD4xxx CMOS technology ICs for the logical part, BF247B and 3N187 FET transistors for the HF stage and U6A775-7312, SL621, MC1350, TBA790 for the IF stage and TBA810S for the audio.

Most units are fitted with green fluorescent tubes for the frequency display. Some last units where retro-fitted with red LED display cards.

Two models were produced: the last one differs from the very first model by offering two A1 dedicated filters.
That's one more filter than the first model which was using the SSB filter for the wide band A1 filter.

The TRC-394B is the same design but uses a switch frequency selection and offers 12 hardwired (first models) or static memories (later models).
The TRC-394C is the latest design that offers far better performances and functionnalities.


Front view Mod.1Front view Mod.2
Upper view Mod.1Upper View Mod.2
Under view
Rear view

Last revision: 02/05/2005