RSP-1 as a bat receiver?

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RSP-1 as a bat receiver?

Postby radiogareth » Wed Sep 06, 2017 7:21 am

My wife and I went on a bat walk last night and were lent a simple bat RX that tuned from 20KHz to over 100KHz. Inevitable I thought I'd try this, realising that my RSP will receive down to 10KHz. Has anyone any advice on what to use as an aerial? I'm thinking ultrasonic transducer, piezo tweeter from a loudspeaker etc. Will I need some matching or pre-amp? Could be a whole new market for RSP's. watching the WHOLE bat spectrum would be easy.....
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Re: RSP-1 as a bat receiver?

Postby WA2AKV » Mon Sep 25, 2017 4:49 pm

Excellent idea old man. When I was 12 years old in 1962 I built an "ultrasonic sniffer" from a circuit in Popular Electronics. The input to this device were audio frequencies in the range of 20-60Khz, the output was in the human audio range. Today there are various "transducers" that can be used for the "aerial" as you say - just Google 'ultrasonic sensors' that should get you started. BTW I had the same idea as you just a couple of days ago after a visit to Austin Texas after visiting the Congress Ave bridge and the nightly bat swarm.
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SOTA QRP and other radio interests

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Re: RSP-1 as a bat receiver?

Postby g1hbe » Mon Sep 25, 2017 11:14 pm

I've built a few bat detectors and the difficulty is always the transducer. Some electret mics will reach up to about 20+KHz but most bats operate above this. Then there are the cheap 40KHz transducers that work well but their response is quite narrowband and they only pick up in the range of maybe 37 to 43 KHz. I'm using one of these at the moment and although I do hear the odd bat in the evenings, I am aware that I'm probably missing most of the action.
Some people say that piezo tweeters work, but I've never found one that does!

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