diy shotgun microphone interference tube.

[Qmavam]

https://videomicntg.rode.com/!

I'm disappointed in the non labeling of the attenuation on beamwidth charts, Oh, they label degrees on them, which I don't need, but no label on the db lines or whether they are even in reference to db. One could assume they are 3 db, but the only chart I gave seen lately that had a label, was 5db per line. Arrgh!

 

[Qmavam]

I notice all the directional mics stop the perferations some distance from the mic capsule, is this an important dimension?

 

[flashlamp]

on the ck8 it's a snowflake star shape

 

[flashlamp]

i think the interference tube turns cardiod to omni untill the holes or slots are added the holes make shotgun mic super or hyper cardiod .

 

[abbey road d enfer]

I'm disappointed in the non labeling of the attenuation on beamwidth charts, Oh, they label degrees on them, which I don't need, but no label on the db lines or whether they are even in reference to db. One could assume they are 3 db, but the only chart I gave seen lately that had a label, was 5db per line. Arrgh!

Traditionally, the ticks are 5dB. However, there are exceptions, typically from dishonest sources.

 

[abbey road d enfer]

i think the interference tube turns cardiod to omni untill the holes or slots are added the holes make shotgun mic super or hyper cardiod .

If you wanted the interference tube to work down to 50 Hz, it would need to be 1.7m long (almost 6 ft).
In order to keep dimensions acceptable, the pattern shifts from interference-controlled to delay-controlled cardioid.
At high frequencies; where the capsule size becomes comparable to the wavelength, the interference tube ceases to operate, leaving place for diffraction controlled directivity and masking of the rear-axis waves by the closed back of the mic.

 

[flashlamp]

If you wanted the interference tube to work down to 50 Hz, it would need to be 1.7m long (almost 6 ft).
In order to keep dimensions acceptable, the pattern shifts from interference-controlled to delay-controlled cardioid.
At high frequencies; where the capsule size becomes comparable to the wavelength, the interference tube ceases to operate, leaving place for diffraction controlled directivity and masking of the rear-axis waves by the closed back of the mic.

so about 5.5 feet , 5.57743 , though would it work. if used for outdoors.

 

[flashlamp]

so about 5.5 feet , 5.57743 , though would it work. if used for outdoors.

say for field recording.

 

[flashlamp]

would hypercardiod be easier like my c451s use that outside.
just eq, anyway i will probably and record diologue voiceover with a ribbon. as everyone is wearing covid masks fix in post is much easier and the the one of the pm2 mics indoors. , is it easy to match a 451 to a ribbon with eq. i would think the 451 sounds kind of ribbony through bit bright.

 

[Qmavam]

so about 5.5 feet , 5.57743 , though would it work. if used for outdoors.

Am I correct that equates to 11.04" for 300Hz?

 

[flashlamp]

Am I correct that equates to 11.04" for 300Hz?

if i were to try the rode style drilled holes would , i need a 3 axis vise like a compound vise , or would my drill press vise work.

 

[flashlamp]

are these good references.

 

[swpaskett]

I'm no machinist, but there are machinist forums just like there are electronics forums. I think you would find better answers there for this kind of problem. I think you will be dissatisfied with the results you can get from a drill press.