Thanks all for good suggestions.
I Will try all to find a good results. I start searching for solutions because I saw so many good received from SSTV pictures from ISS this days.
APRS frequency here is on 144.800MHz

BR Andy

On Mon, Dec 28, 2020 at 7:15 PM Pedro Converso <pconver@gmail.com> wrote:
Try attenuate RF entry level on SDR Dongle

73, lu7abf, Pedro

On 12/28/20, Jean Marc Momple <jean.marc.momple@gmail.com> wrote:
> Andy,
>
> To filter at RF level between 145.800 and 145.825 MHz will require a lot of
> cavities and even if possible most probably the attenuation would make the
> whole exercise useless.
>
> May be at baseband level but I am not really competent to advise, your
> question is of interest and anyone who may help there is most welcome.
>
>
> 73
>
>
> Jean Marc (3B8DU)
>
>
>> On Dec 28, 2020, at 9:34 PM, Andy Brian <briaandy@gmail.com> wrote:
>>
>> Hi,
>>
>> I received many pictures from ISS. I'm using RTL dongle 2832 with SDR#
>> program and
>> MMSSTV with virtual cable and Orbitron.I found many rainbow lines on
>> pictures and I analysed that this is the case of transmission  with APRS
>> local stations around 5km away and 1mhz below my receiving.
>> Anyone have experirence of good filtering or set the SDR# program to
>> reduce the infulence from
>> of transmitter which is far away from 145.8MHz but still in the 2MHz
>> bandwidth of RTL2832?
>>
>> BR Andy
>>
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