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LF: FZ-02

To: [email protected]
Subject: LF: FZ-02
From: DK7FC <[email protected]>
Date: Mon, 16 Feb 2015 23:48:36 +0100
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I also use this FZ-02 Filter in my receivers with good results.
You can even use it to make some "gain" when using the 500 Ohm input and the 18k output...
73, Stefan

Am 16.02.2015 23:28, schrieb Tobias DG3LV:
Hi Mauro !

The FZ_02 mechanical filter can be easily inserted into a 50 Ohm receiving(!) system by the use of two 1:9 transformers (at Input and Output of the FZ-02) to match the 500 Ohm Input/Output impedances of the filter at the yellow wires! Use capacitors of the exact capacity [in pF] as printed at both ends of the filter for compensation. (I soldered the capacitors to the unused 18k-Ohm wires = red).
You will get a flat top of the attenuation curve and steep edges.

measured Attenuations at :
461.2 kHz -64.91dB
467.1 kHz  -3.10dB
473.0 kHz  -2.70dB
479.1 kHz  -3.48dB
485.3 kHz -63.62dB

used 1:9 Transformer : FT50-43 toroid, 10 turns of (flat) trifilar enamelled wire (AWG #26).
This filter is a good cure to all sorts of intermodulation and noise
caused by out-of-band signals.
73 de dg3lv Tobias

Am 16.02.2015 um 22:08 schrieb IK1WVQ Mauro:
hi Luigi,
this is the schematic of my stupid receiver..
today I bought from Ebay a mechanical filter FZ_02 to clean a bit the

coming soon: a 20W TX (mosfet IRF510) for tests with "earth_electrode
antenna" (impossible for me to build a Marconi)

73 de Mauro IK1WVQ

Very interesting... Do you have  mord info Mauro?

Inviato da iPhone

> Il giorno 15/feb/2015, alle ore 22:28, IK1WVQ Mauro <[email protected]>
ha scritto:
> Hi Luigi,
> your signal is ok here in JN44CB.
> my antenna is PA0RDT
> RX is a simple NE602 mixer with a MF 455kHz(yallow core) front end ..
> no RF preamplifier, no audio postamplifier . directly to the MIC
input of PC !!
> 73 de Mauro IK1WVQ
> At 13:40 15/02/2015, IZ7PDX Luigi D. wrote:
>> Gm Mf ...
>> I have the pleasure to introduce my new  QRSS3 test beacon at
476.150 Khz in JN80PS.
>> 25 mt new Marconi antenna , 50 W.
>> Daily and night reports are welcome !
>> Thanks in advance.
>> Vy 73 de Luigi IZ7PDX
>> Inviato da iPhone
> <argo_ik7pdx_0020.jpg>

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