Bit of a random question and despite my callsign I don't know the answer, hence asking!
We are using a turnstile antenna designed for weather satellites for the FUNcube satellite. Here it is http://www.moonraker.eu/turnstile-137-weather-satellite-antenna-1
Can we simply shorten the top dipoles to make it resonant for the 2m band? Obviously there is a relationship between the upper and lower elements both in length and distance apart but I wasn't sure how critical it is. Would it make enough of a difference for receiving FUNcube satellite signals to justify taking it down to modify it?
Also, once tuned, if it can be would it then be any use for transmitting? This would then allow us to use the 2m band for local contacts without the need for a separate antenna. That said would it perform too poorly compared to say a dual band colinear?
Hope that all makes some sense.