thenannymoh Posted February 10, 2020 Report Share Posted February 10, 2020 Looking for any experience people have with using their SNA600a dipole antenna to feed wideband receivers or receivers of different (but adjacent) blocks. For example, if I were to have both block 21 and 22 in the bag, what (if any) antenna performance degradation could I expect by adjusting the dipole arm lengths to be roughly center for the combined blocks. cheers! Quote Link to comment Share on other sites More sharing options...
DanStewart Posted February 10, 2020 Report Share Posted February 10, 2020 If you split the RX antenna length between the 21 and 22 marks and tune the 21 TXs to the higher end of their tuning range and tune the 22 TXs to the lower end of their tuning range your performance will be optimal. In theory, I believe this setup would be no different than using the full tuning range of a specific block. Quote Link to comment Share on other sites More sharing options...
sciproductions Posted February 11, 2020 Report Share Posted February 11, 2020 My block setup is 24 / 25 / 26, each containing 2 channels, fed by 2 SNA600a's Depending on how many channels I'm running I center the SNA freq. Generally I run 4 channels, so I keep the freq at the very top of block 24, have never had any problems at all. Even when I center it at 25, I don't get problems (that said I try to keep frequencies at the upper end of 24, or lower end of 26), range seems to barely be impacted if it at all. You'll have no problems with 2 blocks. Quote Link to comment Share on other sites More sharing options...
berniebeaudry Posted February 11, 2020 Report Share Posted February 11, 2020 I'm using two SNA600a with four Lectro LRs. Two in A1 and two in B1. Reception is really good. Better than whips and on harness dipoles. Quote Link to comment Share on other sites More sharing options...
LarryF Posted February 11, 2020 Report Share Posted February 11, 2020 (edited) The bandwidth for a 2:1 SWR (Standing Wave Ratio) is generally considered a good operating bandwidth for an antenna. The 2:1 SWR of the SNA600 is +- 50 MHz or 100 MHz bandwidth or 4 full Lectro blocks. The 3 db down points are +- 75 MHz or 150 MHz bandwidth or 6 blocks. The frequency markings for the arms of the dipole are for centering the frequency range but don't exclude frequencies that are within a block or two of the center. The design was deliberately made wideband with the fat dipole arms. You can see that the real world operating frequencies described by the posters above (thanks) fall within these criteria. Best Regards, Larry Fisher Edited February 11, 2020 by LarryF 100 MHz is 4 blocks not 2 blocks Quote Link to comment Share on other sites More sharing options...
thenannymoh Posted February 11, 2020 Author Report Share Posted February 11, 2020 Thanks for sharing your experiences on this guys, and thank you Larry for your clear explanations (as usual). Helps me make informed purchase decisions Quote Link to comment Share on other sites More sharing options...
LarryF Posted February 11, 2020 Report Share Posted February 11, 2020 100 MHz is 4 full blocks not 2. Have edited. LEF Quote Link to comment Share on other sites More sharing options...
Matthew Steel Posted February 11, 2020 Report Share Posted February 11, 2020 Others have answered but here is one more personal experience to add to the pot. I once ran a musical theater show where I used a single pair of SNA600 antennas to feed 38 UHF receivers spanning blocks 470-26. In that case I believe the SNA600s were fully extended so the block 24-26 stuff was outside the frequency range Larry mentioned. It still performed flawlessly. Quote Link to comment Share on other sites More sharing options...
Jesse Flaitz Posted February 14, 2020 Report Share Posted February 14, 2020 All my wireless are block 19-22, I set the dipoles at near max length and dont need to adjust. They are quite fantastic in that way, as Larry said above, since they cover ~100Mhz. "Exact" quarter wave or half wave antennas would never work out given how often we need to adjust frequencies, it's always an average across a bandwidth. The SNA600 more than cover the averages of multiple blocks. I have 4 of them and use them for various wireless applications with great success. I do want to test out the new Betso bow ties to test them against the SNAs, but from other reviews it seems they are more or less comparable. Quote Link to comment Share on other sites More sharing options...
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