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380mhz-430mhz


#1

i have just acquired 2 antennas for 380-430 MHz, not realising, these are not our bands, so if anyone can make use of them please e-mail me at m0sgb@yahoo.co.uk


#2

In reply to M0SGB:

Can you not shorten them for 430-440?
What sort of antennas?

73 Steve GW7AAV


#3

In reply to GW7AAV:
Sorry was a bit late when i posted.
The antennas are sigma,
type cr420h/tsv7d,
length approx 7-8 inches with more coax than you can imagine, on the packet it says dolphin telecommunications from basingstoke,
Steve m0sgb


#4

In reply to M0SGB:

steve m0sgb


#5

In reply to M0SGB:

Chop the whip down to about 6 1/2 inches and they should be good for 433 mHz.
Best if you can find someone with an antenna analyser and trim them accurately but an SWR bridge that covers 70cms would get you near enough to use. They should make a nice low impact alternative to a dual band antenna.

Steve GW7AAV


#6

In reply to GW7AAV:

Trim them in situ as the environment can have a big affect on antennas like these. Also do the trimming in stages. It’s always easier to take another mm off the length than add it back on!

Andy
M0FMF