From: DK7FC <73dk7fc@googlemail.com>
Message-ID: <54E273C4.2030905@gmail.com>
Date: Mon, 16 Feb 2015 23:48:36 +0100
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References: <97CF0B1C-93C3-4667-8AFB-EF3B559FF9AE@iz7pdx.it> <E1YN6k9-0002p1-99@post.thorcom.com> <799A8358-390F-4A95-8B4F-ACF90396344E@iz7pdx.it> <E1YNSuF-0005i9-Cy@post.thorcom.com> <54E26EF4.20100@gmx.net>
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Subject: LF: FZ-02
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Status: O

Hi,

I also use this FZ-02 Filter in my receivers with good results.
https://dl.dropboxusercontent.com/u/19882028/MF/473%20kHz%20ZF%20Filter%2040%20dB.png
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
>> spectrum.
>>
>> 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 <ik1wvq@stmb.it>
>>> 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>
>