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Amateur-satellites with 38400 Baud FSK-modulation (G3RUH) are in the orbit since 1999. First packet-radio digipeaters with 76 kBaud are operative in Germany. With the IFD, you can expand the capabilities of most amateur radio receivers to high speed data reception as 38400, 76800 and up to 153600 Baud.
Principle of function: The IF signal of your amateur radio receiver is tapped directly behind the rf frontend (1st mixer) and connected to the input of the IFD module. There, the signal is converted to a second IF frequency of 10,7 MHz by a mixer circuit and a fixed frequency crystal oscillator. The IFD assembly is available for most common IF frequencies e.g. 71 MHz, 45 MHz, 21,4 MHz, 13,45 MHz or 47,43 MHz (FT736) or 10,7 MHz. The bandwidth of the IFD amplifier is standard 110 kHz for 76 kBit/s maximum data rate. Wider filters (300 kHz / 156 kBaud) or narrower types (80 kHz / 38 kBaud) are available upon request.
If a external oscillator (VFO) is connected, the IFD module may be used as a simple wideband receiver with FM demodulator, e.g. as receiver for UHF/SHF/EHF converters.
Description, installation instruction and special parts (coax cable, transformers if required) come with the IFD. The assembly is tested and adjusted. Until now, you can order the IFD for the transceiver types FT736, FT748, IC820/821, IC471, IC475, TS790, TM-V7E and similar.
Data: Supply 8 to 18 Volt DC, filter bandwidth: 110 kHz (standard), audio/data bandwidth: over 25 kHz, input frequency: 1 to 150 MHz, sensitivity: ca. 1 mV / -110 dBm @ 50 Ohm, buffered logarithmic RSSI-output 0...5 Volt for -110 to -40 dBm signal strength measuring, low impedance data/AF-output 0.12 Volt at 38 kBaud data rate (low-pass-filtered).
When ordering, please mention the radio type for which you intend to use the IFD with.
Compunent layout plan (select for magnified view)
Output signal of IFD (RX=TM455, baud rate 76800 Baud FSK)
| Transceiver Type | 1. IF frequency | IF-impedace | Extras |
| Yaesu FT736 | 47,430 MHz | 50 Ohm | simple to install, supply via koax cable |
| Yaesu FT847 | 45,705 MHz | 50 Ohm | external installation necessary |
| ICOM IC471 | 70,4515 MHz | 50 Ohm | same as IC475 |
| ICOM IC475 | 70,4515 MHz | 50 Ohm | same as IC471 |
| ICOM IC910 | 71,350 MHz | 50 Ohm | good to install in the case, similar to IC970,
available for VHF (IF 10.7 MHz) and UHF (IF 71.35 MHz) band |
| ICOM IC820 | 71,350 MHz | 50 Ohm | |
| ICOM IC821 | 71,350 MHz | 50 Ohm | |
| ICOM IC970 | 71,350 MHz | 50 Ohm | without problems |
| Kenwood TS790 | 75,975 MHz | 450 Ohm | |
| Kenwood TS2000 | 41.895 MHz | 450 Ohm | not a big problem. SMD parts to solder. |
| Kenwood TR851 | 41,415 MHz | 450 Ohm | same as TM455 |
| Kenwood TM 455 |
41,415 MHz | 50 Ohm | very easy to install |
| Kenwood TM-V7E | 10,700 MHz | 450 Ohm | external installation necessary |
| general RX | 10,700 MHz | 50 Ohm | for homebuilt RX with 10,7 MHz IF |
| general RX | 71,000 MHz | 50 Ohm | for homebuilt RX with 71,0 MHz IF |
Ordering instructions: F-IFD for transceiver-type xxxx, desired baudrate (bandwidth) xxxx Baud.
Here some examples for installation instructions (most pictures omitted to save bytes)
for other installation manuals please send us an e-mail
| X Installation instructions IFD for Yaesu FT736 transceiver |
| X Installation instructions IFD for ICOM IC471 / 475 transceiver |
| X Installation instructions IFD for ICOM IC820/821 transceiver |
| X Installation instructions IFD for ICOM IC910 transceiver (.pdf) |
| X Installation instructions IFD for ICOM IC970 transceiver |
| X Installation instructions IFD for Kenwood TS 790 transceiver (.pdf) |
| X Installation instructions IFD for Kenwood TS 2000 (PDF) |
| X Installation instructions IFD for Kenwood TN 455 transceiver |
| X Installation instructions IFD for Yaesu FT847 transceiver |
| X More pages on amateur-radio satellites |