Best products from r/broadcastengineering

As a long time broadcast engineer and amateur radio operator, working this kind of project is fun for me, so I enjoy helping any way I can.

Let's start with some assumptions:

• You want to hear what you would if you were swimming at the location of the microphone (no ultrasonics or infrasonics).
  
• The volume of the sound would be somewhere between a human whisper (or dolphin mumble) and a shout.
  
• Only the microphone (hydrophone) would need to be submerged; there would be dry, above-water space for equipment that could be kept dry and relatively temperate (Above 32º below 100º F).
  
• There would be a way to gain stable, above-water height for an antenna that needs to maintain its orientation in inclement weather.
  
• The climate is such that at least some direct sunlight would be expected on most days (for solar power).
  
• Initially use a direct radio link with a service distance is no farther than the radio horizon, a little farther than the optical horizon, depending on antenna heights at both ends of the signal path (maximum practical range about 15 miles).
  
• A mast- or tower-mounted receiving antenna with line-of-sight to the transmitter is possible.
  
• You would use readily available commercial hardware.
  
  With these as a starting point, the hydrophone from this system could be connected to a commercial VHF wireless microphone transmitter like this. With some small modifications, these low-power units could be solar powered. Transmitting and power supply equipment (including batteries) could be mounted in a sealed enclosure like one of these.
  
  To extend the range, the wireless transmitter could connect to commercial TV antennas to provide a link of 500 ft. or more. The receiver could be connected to almost any audio system for listening or to the audio input of a laptop computer for recording. This setup would be inexpensive and "real-time" with microseconds of delay between an actual sound and when it was heard.
  
  A second level might be a digital setup based on a computer and streaming transmission between the remote audio source and a receive point using IP. This would be more expensive but would have a number of advantages, including the ability to record the audio at the hydrophone site for later recovery. There are a wide variety of commercial IP radio links available for short-range (up to the radio horizon) transmission to connect to a LAN and/or the public internet. It's also possible to use satellite connectivity such as Hughesnet, for nearly unlimited coverage.
  
  A power system like this could power almost any setup you might want to use. A much smaller system could power a low-power direct link.
  
  Hope this gives you some ideas on how to start.
  
  I'm insanely curious about this, so please if you have questions, please ask.
  
  Larry
  
  
  
  
  

I use wera stainless steel with the laser etched heads. They work wonders and stay in the freakin hole...even flat blades. here is the link

https://www.amazon.com/Greenlee-1916-Extraction-Tool-12-Inches/dp/B0012YQ8W2

Simple c-stand mount:

https://www.amazon.com/gp/product/B001GCUO8O/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1


Clamp that I've used:

https://www.amazon.com/gp/product/B00EHSS23I/ref=ppx_yo_dt_b_asin_title_o02_s01?ie=UTF8&psc=1


Adjustable clamp, you'll need a 1/4-20 screw:

https://www.amazon.com/gp/product/B01EWNHL3Y/ref=ppx_od_dt_b_asin_title_s00?ie=UTF8&psc=1

Some combination of those should work for you. I've used them for Brc900s and 1000s