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I'm tempted by that ,
but if anyone else wants to grab it do ,
Rogs , it could be the missing piece of the puzzle ,
The problem with that type of capsule -- and I suspect almost all SDC capsiules? -- is that the capactiance is likely to be only around 40pF.
With the inductors I have used for my experimental RF mic, that kind of value is just too low to get good results.
It would seem that most - if not all? - commercial RF mics from Sennheiser and Rode use SDC capsules.... And the inductors used in their circuits are obviously designed to work with those capsules....
The trouble with RF bias hobby mics is finding someone with the expertise - and inclination? - to design inductors suitable for use with lower capacitance capsules.
I found the inductors I use by chance... They are not perfect for the task, but are quite close when used with caspules with a capacitance of 65pF or more.
I've never come across any alternative 'off the shelf' inductors that are close to being useful for this task - especially for use with lower value capsules.
It seems that 'old style' IF can format RF transformers are now only made in India, and are becomng rarer all the time.
So I'm stuck with LDCs and larger diameter bodies for my experiments....
In fact, it could be that these are the only LDC RF bias mics avaialable anywhere?...
That's probably because they have limited applications, compared to the Sennheiser and Rode shotgun mic uses.
At the moment I'm looking at trying out one of the Arienne Audio 'flat K.47' capsules in a figure of 8 configuration.
The fact that those capsules are matched to within 1dB could present some interesting results....
Used with a second, separately housed, cardioid capsule it might make an interesting Mid/Side mic, for full range, low noise outdoor recordings.
A bit cumbersome though. -- The capsules need to be housed separately, to avoid RF 'birdies' between 2 independently modulated RF oscillators.
Like Doug, I've never come across the Stephens mic before -- that BBC paper you linked to has some interesting notes about it.
I thought the idea of connecting the mic head to the electronics with specific lengths of cable was quite an interesting concept....
So, Stephens and AKG (and maybe others?) 'dipped their toes' into the world of RF mics back in the day, but is seems that only Sennheiser -- and more recently Rode - have ever run with the concept commercially....