Eric Toline Posted April 7, 2019 Report Share Posted April 7, 2019 Lectro uses a different measurement starting point than Sennheiser does. Antennas are cut for the center frequency of the block they are in. Center frequency for your case would be 643. Nothing to worry about. Quote Link to comment Share on other sites More sharing options...
Mattias Larsen Posted August 25, 2020 Report Share Posted August 25, 2020 Maybe someone here can help me to understand. I have just got a G3 pair modded.The antenna might not be 100% the right length. But how to measure the right way? From which point of the connector do I start to measure? Seems to be around 8,45 cm according to some calculators. I got range E-Band Pair. I guess the center freq would be 844mhz which would be somewhere between block 32-33 on the lectro guide ~7,35cm above the connector. Orginal whip for the same block is slightly shorter than that even (guess it has to do with how it is connected). Around 7 cm above the body it seems. Quote Link to comment Share on other sites More sharing options...
mark kirchner Posted August 25, 2020 Report Share Posted August 25, 2020 Measure just the part of the antenna that is above the connector. Quote Link to comment Share on other sites More sharing options...
Vincent R. Posted August 25, 2020 Report Share Posted August 25, 2020 46 minutes ago, Mattias Larsen said: Maybe someone here can help me to understand. I have just got a G3 pair modded.The antenna might not be 100% the right length. But how to measure the right way? From which point of the connector do I start to measure? Seems to be around 8,45 cm according to some calculators. I got range E-Band Pair. I guess the center freq would be 844mhz which would be somewhere between block 32-33 on the lectro guide ~7,35cm above the connector. Orginal whip for the same block is slightly shorter than that even (guess it has to do with how it is connected). Around 7 cm above the body it seems. What mark says. Start measuring from "right above the connector". Does it matter if you off by a bit? Nah... You won't notice the difference. Quote Link to comment Share on other sites More sharing options...
LarryF Posted August 25, 2020 Report Share Posted August 25, 2020 57 minutes ago, Vincent R. said: What mark says. Start measuring from "right above the connector". Does it matter if you off by a bit? Nah... You won't notice the difference. +1 The calculated values will be off anyway since they assume an infinite flat ground plane. The only way to be dead on is to use a network analyzer. The Lectro values were found that way. The lengths will work on a G3 just as well. Also, when the antenna is near a big bag of water (talent) you can throw the precise lengths all out the window anyway. Best Regards, Larry Fisher Quote Link to comment Share on other sites More sharing options...
Mattias Larsen Posted August 26, 2020 Report Share Posted August 26, 2020 Wonderful, thank you a lot! I guess closer to 7,35cm above the connector than 8,45cm? Quote Link to comment Share on other sites More sharing options...
Vincent R. Posted August 26, 2020 Report Share Posted August 26, 2020 2 hours ago, Mattias Larsen said: Wonderful, thank you a lot! I guess closer to 7,35cm above the connector than 8,45cm? Mattias, this is an important part of Larry's reply 😉 9 hours ago, LarryF said: Also, when the antenna is near a big bag of water (talent) you can throw the precise lengths all out the window anyway. In other words; It will matter sh*t if the RX or TX is close to you or an actor. Quote Link to comment Share on other sites More sharing options...
Mattias Larsen Posted August 26, 2020 Report Share Posted August 26, 2020 Sure, but cant hurt to try to optimise it Quote Link to comment Share on other sites More sharing options...
Vincent R. Posted August 26, 2020 Report Share Posted August 26, 2020 1 minute ago, Mattias Larsen said: Sure, but cant hurt to try to optimise it The point I (and Larry) are trying to make, is there is no optimal/optimisation in this, since there is a huge variable in the way (literally). changing from day to day (talent to talent, location to location). Maybe one place one 8 cm would have been better, maybe on place two and actor two 7.8 cm would have been better.. Don't worry about it. Quote Link to comment Share on other sites More sharing options...
LarryF Posted August 27, 2020 Report Share Posted August 27, 2020 On 8/26/2020 at 5:25 AM, Mattias Larsen said: Sure, but cant hurt to try to optimise it True. The Lectro antenna lengths are optimum for a transmitter in free space, away from any objects or persons. You will rarely, if ever, use a transmitter in this way. My advice is to use the Lectro antenna length guide and continue onward. Click on the PDF file in this link, print it out and use the template. Note there is a 6 inch line (15.24 cm) that you should measure to make sure your printer is 1:1 in reproduction. Most aren't so you will have to adjust a bit. Best Regards, Larry Fisher Quote Link to comment Share on other sites More sharing options...
Mattias Larsen Posted August 28, 2020 Report Share Posted August 28, 2020 Thank you! Will use this chart as a guideline then to get the antennas in the ballpark. Quote Link to comment Share on other sites More sharing options...
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