SWISS-PTC II HF-Radio Modem
Description :
The SWISS-PTC II is a state-of-the-art DSP based HF-modem designed for professional applications. The SWISS-PTC II connects to PC-compatible laptop or desktop computers. The modem uses advanced modulation and coding methods resulting in extremely reliable data transfer even during poor HF-propagation conditions. Experience of our customers has shown, that the SWISS-PTC II outperforms most other HF-modems under typical HF-propagation conditions. The SWISS-PTC II modem is still transferring error-free data when other modems give up.
Due to the advanced frequency tracking capabilities, the SWISS-PTC II can be connected to a large variety of HF-radios.
The SWISS-PTC II is the choice
for efficient and reliable transmission of e-mail and data over HF-Radio
links.
The SWISS-PTC II modem uses extremely robust modulation methods,
convolutional coding and interleaving. This allows data communications
even over HF-channels with very poor propagation conditions.
The SWISS-PTC II modem can be connected to a large variety of HF
radios.
| Data throughput | 589 Bit/sec uncompressed data, equivalent
to 1000 Bit/sec plain text using the automatic data compression. Under typical HF propagation conditions, experience has shown, that the SWISS- PTC II is very often faster than so called '6000 bits/sec modems' |
|---|---|
| Required S/N ratio | Maintains reliable commiunication down to a S/N ratio of minus 18dB (@ B = 4KHz). |
| Required bandwidth | 450 Hz (at -50dB) |
| Modulation | Staggered 2-tone Differential Phase Shift Keying using 2-16 phase differences - Raised cosine shaped pulses resulting in a crest factor of 1,45 |
| Channel coding | Convolutional code (k-9) combined with full frame interleaving, Viterbi decoding with soft decision. Code rate adapted to applicable mode, between 1/2 and 7/8. |
| Compression | Huffman or Pseudo-Markow plus run- length encoding, selfadaptive (optimizing) |
| Protocol and adaptivity | Advanced half-duplex hybrid ARQ with memory. The modem parameters (code rate, number of DPSK levels etc.) continuously adapt to the varying link conditions |
| Frequency tracking | Initial offset: up to +/- 80Hz Drift: up to 10Hz/min |
| Compatibility | Fully compatible to CCIR-476/625 SITOR and PTC-I systems with automatic switching - Public/Non- Public same as PTC-I |
| Selective call | 3 to 8-digits alphanumeric addressing |
| Front panel displays | Tuning LED-bar, Connect, Sending, Error, Request LEDs |
| Rear panel connectors | Radio port, Data port, PR port, Control port & Power switch |
| RX audio input | RX audio input |
| TX audio level | Software adjustable between +5dBm and -35dBm |
| Radio port | Sub-D-15M providing balanced and unbalanced TX and RX audio, PTT (open collector), FSK (TTL), Scan- Stop, GND, +DC supply input and 3 spare pins |
| Serial interface (data port) | Sub-D-9F connector, 300 - 115 kBaud |
| Supply power | +9VDC to 20VDC (current at 13,5VDC = 250 mA) |
| Dimensions | Aluminium extrusion cabinet 210 * 170 * 55mm / 1,2Kg |
Euro Radio System
