I have a few different callers but the most effective is a DIY one
They are nothing new & not my idea but here’s how I make mine.
Get 2 Strips of thin wood, about 10 – 15mm wide, you can use lollipop sticks, off cuts of trimmed thin ply, whatever you wish, some even use old clothes pegs but I find they are too thick for altering the pitch with your teeth.
Tape a collar round both the top and bottom sections and at both ends, this will keep the reed material (video tape or cassette tape) from touching the wood and muffling the call.
I use self amalgamating tape for the collars as the reed material sticks well to them when setting I up.
Stretch the reed material tape tightly onto the lower section of the wood, hold in place and squeeze on the top section ensuring the tape material is as tight as possible. (Leaving long tag ends of the reed material and this will help you pull it tight once the two pieces of wood are held together)
The self amalg usually does the business and stops the tape from sliding.
Pinch it at both ends and give it a blow to see how it sounds.
Trial and error with reed material tension will give you an idea of what you need to do.
If the wood you have used is flexible enough then try squeezing at different parts to vary the pitch when you blow, you should now have a tiptop squeak for next to nothing.
Leave an end free if you wish to stick it on a lanyard, helps with hands free calling
I put a final taping of vinyl tape round the self amalg just to finish it off and stop rubbish sticking to the self amalg in the pockets etc
The hardest part if finding a VHS or Cassette tape for your reed material!
Varying the thickness of the reed material can also adjust the pitch too, just trim it with a Stanley blade or similar.
I use it for both day and night calling, here’s the result I had last week during the day.
This one had been very elusive recently but had been killing ducks and chickens frequently so had to go before lambing starts.
Give it a try, it really does work!!
Rb