I got the 407s for £59 as my second receiver (408s came with radio) as the 409s was too expensive. It's the same size as the 408s but the antenna wire is a different kind (cheaper) hence the price difference. all the remaining 407s specs are identical to the 408/409 (supported response types, # of channels, etc).
works perfectly in my b44.
BTW - not sure if the "B" port will power a PT, if you have one, as I think that is for a receiver pack only...
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