Hi Stefan,
Opperman is great, they will sell to VK and I can pay via Paypal.
Thanks for making me aware of this shop and the filter.
So, are you using this filter in a DC receiver front end? I want to
make a simple DC receiver because I want to set up a RX station at the
top of the heavy ion accelerator building, at work. That will put the
RX antenna at the top of a 50 metre tower, which may produce
interesting results. I can also use a simple low power DC receiver at
my block. It's amazing how low the QRM is over there, but of course, I
don't have mains power.
73, Dimitris
2013/3/10 Stefan Schäfer <[email protected]>:
> Hi Dimitris,
>
> Here i'm also using a AMradiuo IF filter, a mechanical one. There are
> available in a German surplus store,
> http://www.oppermann-electronic.de/html/body_hf-spezialbauteile.html FZ-02.
> Now they cost 6 Euro, i remember they started with 5 EUR ;-) Anyway cheap i
> find because they work really excellent and the effort isn't high to get
> good results.
> I've got this filter curve in a recent measurement:
> https://dl.dropbox.com/u/19882028/MF/473%20kHz%20ZF%20Filter%2040%20dB.png
> and
> https://dl.dropbox.com/u/19882028/MF/473%20kHz%20ZF%20Filter%201%20dB.png
> Datasheet: https://dl.dropbox.com/u/19882028/MF/FZ_01_FZ_02.pdf
>
> 73, Stefan/DK7FC
>
> Am 09.03.2013 04:52, schrieb Dimitrios Tsifakis:
>
>> Hello group,
>>
>> I apologise if I am stating the obvious, but perhaps this will be of
>> interest to someone. Old AM radio IF transformers connected back to
>> back via a tiny capacitor make a simple but effective 475 kHz BPF:
>>
>> http://people.physics.anu.edu.au/~dxt103/472/rx_bpf/
>>
>> 73, Dimitris VK1SV
>>
>
>
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