Test jig for radio mic capsules

[Shez]

I'm sure I've seen a topic about this previously but my search skills are failing.

 

I'm looking to build / procure a test jig that will allow the testing of Shure type lav / headset mics directly with a desk without needing to be connected to a wireless system. It looks like Shure make a preamp that might work - RPM 626 - but they suggest that's only suitable for their Beta mics. I'm sure one could construct something suitable with a 9v battery and a couple of other components. Anyone done anything similar?

[Hilary Watts]

I made one for Sennheiser mics some time ago. So far as I can remember it's just a box witha minjack input with 2 AA batteries providing the power to the mic. There's then a capacitor to block the DC on the output which is a male XLR socket. I don't know if it's the 'correct' way to do it but it works. I'll have a look when I get home.

Alternatively something like this might do the trick although at present I haven't been able to find a version with a Shure connector and I don't know if the voltage required by the mic is the same. However, the cheap cpc type headsets seem to be available with a variety of connectors to fit the major brands, which suggests that the voltage supplied by the beltpacks is the same.or alternatively that a range of voltages is acceptable.

[p.k.roberts]

The pin-outs listed here look like it should be a fairly simple job;

 

https://www.shure.com/en-US/support/find-an-answer/pin-out-for-shure-bodypack-transmitters-and-preamps-ta4m-ta4f

 

but if I read your question correctly, you only really need a phantom power adapter, and at this price, it's hardly worth the effort of making one ...

 

https://www.ebay.co.uk/itm/Phantom-Power-Adaptor-For-Shure-Microphone-TA4F-4pin-Mini-XLR-To-XLR-Male/331173447950?_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D1%26asc%3D20131003132420%26meid%3D240992d205334b29bbac7bd62ab9fbc3%26pid%3D100005%26rk%3D1%26rkt%3D12%26mehot%3Dco%26sd%3D273948979219%26itm%3D331173447950%26pmt%3D1%26noa%3D0%26pg%3D2047675%26algv%3DSimplAMLv5PairwiseWeb&_trksid=p2047675.c100005.m1851

[Chappie]

It looks like Shure make a preamp that might work - RPM 626 - but they suggest that's only suitable for their Beta mics.

The RPM626 is used for Beta mics because it's a lower sensitivity and can therefore take the higher SPL required for drum mics. The higher sensitivity model for lavs and headworns etc is the RK100PK.

 

Canford also do a range of pre-amps with different connectors link