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Re: LF: RE: Fwd: Help needed, mechanical filters

from [DK1IS] [Permanent Link][Original]
To: [email protected]
Subject: Re: LF: RE: Fwd: Help needed, mechanical filters
From: DK1IS <[email protected]>
Date: Sat, 30 Jun 2012 11:23:13 +0200
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Am 29.06.2012 23:54, schrieb Stefan Schäfer:
MF,

It becomes better!

I just realised that this filter is perfect to protect a receiver like the IC706 when using a BIG antenna as the MF receive antenna. It will be easy to build a passive circuit out of a transformer 50 Ohm -> 18 kOhm -->Filter--> 18 kOhm -> 50 Ohm. This can be put in a small box and then there will be no problems! I remember how the 706 and others behave on long wires, i.e. multi-band antennas...

73, Stefan

Hi Stefan,

using those filters in the antenna circuit of a rx keep in mind that the maximum input voltage is rather limited due to the high internal Q of the mechanical resonators. Here I have some 200-kHz-units from RFT with maximum input voltage of 2V resp. -10 dB relative to what ever. So be careful when using them with a seperat rx antenna!

73,
Tom, DK1IS
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