Monitoring two frequencies

Scanning Four ACAR frequencies successfully.

My set ups are.

Win 108 & Lowe Airmaster 2000 with an external Airband antenna
Signal R-535 & SkySpy with an external Airband antenna.

Both giving good size log files.

Criteria
A scanner with a sensitive squelch, a bit of patience, and a willingness to experiment.

Locking onto one frequency is the main problem, after extending the Airmaster lead, by slotting in a couple of audio extension leads (mono or stereo) to get the set away from the source the problem disappeared.

Enter the acars frequencies into your scanner alternately, using 10 memory slots ie 131.525 & 131.725 . We now have two other freq.'s to contend with 136.900 & 136.925 these can be randomly slotted in between the previous freq.'s. After various experimenting with the squelch settings the optimum was little or none at all, i.e. a quiet radio.

All experiments were carried out using these Scanners

Win 108 - Excellent results no loss of quantity or quality

Yupiteru MVT-7100 - Excellent results no loss of quantity or quality

Realistic Pro-43 - High loss of quality and quantity

Uniden Bearcat 100XL - High loss of quality and quantity

Signal R-535 Excellent results no loss of quantity or quality

ICOM IC-R2 Excellent results no loss of quantity or quality (the only downside is you cant connect it to a transformer)

All these scanners were used with an externally mounted airband antenna. Best results will always be achieved with an external aerial as internal ones can pick up more interference.

UK ACAR Frequencies

131.725 Still the most used.

131.525 Started off as the secondary freq but now runs on parr with 136.925.

136.900 The least used

136.925 If you have wondered were all the Virgin Atlantic Aircraft have gone this is where you will find them.

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