Here are some examples of bird transmitters with rucksack fixing
C - 1 / ER3 or C - 2 / ER3 [A, RUCK]
On the left or above you see an example of a one or two ER3 batt. extern / intern antenna combination, rucksack fixing 20 / 34g model.
8/XOB 17-12 [A,B]
On the left or above you see a capacitor powered solar cell model, no battery inside, depending on the amount of daylight the trans. has got, it may stop transmitting at night.
Small transmittters in single 1,55 V silver oxyde battery systems for glue on, backpack or tailfeather fixing methods. Collar designs are possible too. These 1,55 V transmitters have lower power consumption and certainly lower output power than the 3,7 V designs.
The lifetime stated here is based on 15 mS pulse length and 3000 mS pause. Weight is taken with minimal potting and a non shrinked, 0.2 mm steel whip antenna with 15 cm length, antenna shrinking for better protection adds some weight and using 2 wires to be soldered reduces some weight.
1. is a 1/V357 type / 190 mA / 2.8 g / with reed switch / rucksack fixing / 5 month lifetime
2. is a 1/V393 type / 80 mA / 1.6 g / with reed switch / glue on type / 2 month lifetime
3. is a 1/V392 type / 45 mA / 1.2 g / with reed switch / rucksack fixing / 1 month lifetime
4 is a 1/V361 type / 23 mA / 0.7 g / solder 2 wires / glue on type / 2 weeks lifetime
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