| PLL TRANSMITTER FOR FM 87.5-108MHz |
| OR 76 - 90 MHz� (JAPAN - EAST) BAND |
| I have purchased an ASPiSYS FM05TX FM PLL Transmitter last year . |
| �Here is some info for that wonderful FM PLL TRANSMITTER. |
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| ASPiSYS FM05TX is an FM PLL radio broadcast transmitter. You can connect audio and broadcast it at a distance up to 1800m using an external 5/8 antenna (the actual distance will depend with surrounding conditions, but the manufacturer guarantees an RF output of� 1W minimum, over the entire band, and I've measured >1W on a Bird 43 power meter). After a modification I've done the board delivers now 1.1W at 50 Ohm. FULL BROADBAND DESIGN, no variable caps to adjust! Reception is on a regular FM radio set anywhere from 87.5MHz to 108MHz (I've used the special model for 76-90MHz Japanese - Eastern Europe band which is also available for link from my studio to the transmitter site) and minimum step of 10KHz. |
| It has two audio inputs: one adjustable-level balanced input pre-amped with 50usec or 75usec pre-emphasis (depending on country) for mono modulation, and one without pre-emphasis for stereo multiplexed signals. Thru it, it can be modulated with any stereo generator signal for excellent quality stereo broadcasts. The sound that I'm getting on my receiver is EXCELLENT!!! You can't feel the difference between the direct CD audio and the incoming audio from the FM05TX! |
| You can change the transmitter frequency immediatelly. Each frequency digit can be changed independently. Just press the corresponding digit button to go to the next value in a circular fashion. After ENTER is pressed the FM PLL is re-programmed and the new transmission frequency is displayed for about 15 seconds before the 5-digit LED display goes out to minimize power consumption. Out-of-bounds frequencies are not allowed. The power-on frequency can be saved to on-board EEPROM at the press of a key. You can order a special edition for your frequency limits (between 76 - 110 MHz zone). |
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| The unit meets all FCC and CCIR requirements for FM transmitters. It has an excellent spectral purity with harmonics rejection better than -64dBc as can be seen in the Spectrum Analyser, spurious output better than -80dBc, and accuracy of the VCO lock-on frequency of +/- 300Hz. The specs confirm that this unit can be used to safely drive RF amplifiers that can accept ~600 mW of signal at 50 Ohm. Maximum PLL lock time less than 5 seconds from lower edge to upper edge frequency change. The RF output power is disabled while PLL is unlocked to reduce possible interference while changing frequencies. |
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| Can't argue with those plots as I didn't have a Spectrum analyzer to check them out. But the plots look good to me. Recenctly I purchase a small spectrum analyzer (10-500MHz) and a modulation meter!!! I'm going to check the performance of the FM05TX!!! However will be a bit difficult to upload some photos, as I don't have a good digital camera :( |
| On-board double-directional coupler provides FORWARD POWER and VSWR signals that can be connected to measurement instruments or to drive logic for automatic protection or control of the PLL and/or possible next-in-line circuits. |
| TECHNICAL SPECIFICATIONS OF THE� ASPiSYS� FM PLL� TRANSMITTER |
| As published on the manufacturer site) |
| Frequency Range |
| 87.5 - 108 MHz (or 76-90 MHz for Japanese / East Europe version� on demand) |
| Min. Step |
| 10 KHz |
| Frequency Drift |
| +/- 300Hz maximum when Fc Locked. |
| Max RF Power |
| 1W at 50 Ohm. No tuning required! |
| Harmonics |
| Better than -65dBc |
| Spurious |
| Better than -80dBc |
| S/N |
| Better than 70dB |
| RF out |
| -20dBc when PLL is unlocked. |
| Audio Inputs |
| One mono balanced with pre-emphasis. One without pre-emphasis for multiplexed stereo signal. |
| Audio Level |
| Adjustable via on-board multi-turn trimmer. |
| Audio Distortion |
| Less than 0.2% @ 1 KHz |
| Pre-emphasis |
| 50 usec (or 75 usec, on demand for USA). |
| Supply Voltage |
| 18 Volt DC |
| Supply Current |
| 390 mA max (mine draws 350mA @ 18.5V DC) |
| Board dimensions: 12.5cm (L) x 9.5cm (W) x 5.5cm (H). |
| The price of the unit is 138 Euros ( ~162 $ US plus P&S 30 $ for DHL for central Europe registered mailing) and it came boxed in a hard carton box. |
| FOR MORE INFO YOU CAN CONTACT WITH THE PEOPLE ON� ASPiSYS AT:� [email protected] |
| I'll upload photos of my stereo unit when I can!!! |
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| GO BACK??? |
| CONTACT ME AT: [email protected] |