Jim Rillie Posted March 20, 2018 Report Share Posted March 20, 2018 (edited) Greetings , I want to use a couple of my unused SNA antennas to transmit from Comtek BST 75-216 transmitters. If I extend the length of the arms from maximum length to a 1/4 wave or 1/2 wave of 216MHZ wavelength, this should work? I don't have formula, but can extrapolate from existing antennas I have. Is there a work around for this, or is there a shop out there who could do this? AND... The answer is: REMOTE AUDIO MIRACLE WHIP MW216 KIT Best regards, Jim Rillie PSM Edited March 20, 2018 by Jim Rillie found the answer Quote Link to comment Share on other sites More sharing options...
LarryF Posted March 20, 2018 Report Share Posted March 20, 2018 Hi Jim, The problem will be that the microstrip balun built in the "handle" of the SNA is also a 1/4 wavelength device. You can look at the copper bulges under the black coating and see that there are some odd pieces of copper doing electromagnetic things. It is broad band enough to handle 450 MHz to 800 MHz but won't stretch down to 216 MHz. Basically, extending the arms would be the same as hooking co-ax up to two 1/4 wave, 216 MHz wire antennas. You'll get signal, (as will the trusty rusty coat hanger) but it is not the correct device you are looking for. You seem to have found the answer in your edit, so great. Best Regards, Larry Fisher Quote Link to comment Share on other sites More sharing options...
Jim Rillie Posted March 20, 2018 Author Report Share Posted March 20, 2018 Thank you, Larry, You're some quick ; - ) JR Quote Link to comment Share on other sites More sharing options...
Andrew From Deity Posted March 26, 2018 Report Share Posted March 26, 2018 What your looking for is this kit right here. It will convert your SNA600 into a Comtek 216 antenna. Here is a link to the kit: https://www.trewaudio.com/product/remote-audio-miracle-whip-mw216-kit/ Quote Link to comment Share on other sites More sharing options...
Matthias Richter Posted March 26, 2018 Report Share Posted March 26, 2018 Larry, in general: does this black metal block with the 3/8“ threads do anything in electronic terms? Or is it just for mounting? Have not installed it for less weight in my bag ... Quote Link to comment Share on other sites More sharing options...
LarryF Posted March 26, 2018 Report Share Posted March 26, 2018 3 hours ago, Matthias Richter said: Larry, in general: does this black metal block with the 3/8“ threads do anything in electronic terms? Or is it just for mounting? Have not installed it for less weight in my bag ... The block is accounted for with the first 1/4" of the microstrip but it really is an undetectable difference. You are perfectly OK to remove it. Best Regards, Larry Fisher Quote Link to comment Share on other sites More sharing options...
Matthias Richter Posted March 26, 2018 Report Share Posted March 26, 2018 Thank you for the „go“ Quote Link to comment Share on other sites More sharing options...
nevo Posted April 7, 2018 Report Share Posted April 7, 2018 Greetings , I want to use a couple of my unused SNA antennas to transmit from Comtek BST 75-216 transmitters. If I extend the length of the arms from maximum length to a 1/4 wave or 1/2 wave of 216MHZ wavelength, this should work? I don't have formula, but can extrapolate from existing antennas I have. Is there a work around for this, or is there a shop out there who could do this? AND... The answer is: REMOTE AUDIO MIRACLE WHIP MW216 KIT Best regards, Jim Rillie PSM Real world I’ve done exactly this and get a solid 200-300 metres Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
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