Apologies if this is not relevant to PSW folks, lock it if so. Iím trying to maintain some Sennheiser ENG wireless systems in the A range. The kits use SK3063 belt-pack transmitters [A=450-626, although the sixteen pre-programmed frequencies are between 500-530]; and more agile EK3241 belt-pack receivers [A=450-626]. There are currently a number of different length antennas in each kit, which canít be right.
I have an Ďantenna length chartí for the EK3241 that says to use a 135mm length. I have an SK3063 Service Manual with a formula that gives a result in centimeters after dividing 7500 by the frequency. It doesnít make clear how to accommodate a range of frequencies, however. Using 450 gives 167mm; 550mm gives 136mm. These results lead me to believe 135mm may be correct.
Sennheiser support says to use the 200mm 542181 antenna [which is actually 220mm], but doesnít mention trimming it to a shorter length. The formula then suggests a [200mm or] 20cm antenna is optimal for 375MHz. Retailers of the 542181 all state to include the frequency range to receive the proper length. Support also states that the SK3063 and EK3241 use the same length.
So Iíd love to know what length is optimal for these systems, and Iím curious how much difference the various lengths we currently have even matter. And [or?] finally is there somewhere I can learn more about this for myself without having to wade through in-depth RF theory thatís way over my head?
Thanks for any input as well as all the activity on this forum,