lna amplifier, sdr & icom pcr2500

[sierratango76]

Hello,
I've an Icom pcr2500 for analogic transmissions and a nooelec smart 4 sdr that I use for dmr decoding. I've buy the nooelec lana lna amplifier, my problem is that I cannot use the lana with the Icom and sdr together because on Icom the background noise increase a lot and "eat" the stations with low signal that without the lna I can hear clearly also if the signal is weak. With the sdr I can manage the background noise via rf gain settings, but with Icom I not understand how to manage it. Anyone can give me an advice for resolve the problem for to use both receivers with lna? Thank you

 

[dlwtrunked]

You are providing too much gain for the PCR2500 which is also related to the the strong stations near you. I would try to determine what strong stations are near you and notch them. Another option is to insert an attenuator (after the pre-amp). I would first try an attenuator of about 10 dB.

 

[sierratango76]

You are providing too much gain for the PCR2500 which is also related to the the strong stations near you. I would try to determine what strong stations are near you and notch them. Another option is to insert an attenuator (after the pre-amp). I would first try an attenuator of about 10 dB.

dlwtrunked thank you for your reply. if possible, could you indicate me please a link where I can buy it? I did a search on web but I don't understand which is the correct attenuator for me. Thank you very much

 

[Ubbe]

You can hardly ever use a LNA amplifier without attenuating the signal so it is just some 6-10dB gain left, if the reciever are good, which a PCR2500 are.

Get a variable attenuator and adjust it for the best signal/noise ratio. Different scanners/receivers need a different amount of gain to not go into overload and loose sensitivity.

20dB variable attenuator.

You will need pigtails, recommended, or adaptors to suit your equipment and you might need one attenuator for each scanner or adjust a single one to adjust to the "worst" receiver that needs the lowest gain.

/Ubbe

 

[sierratango76]

You can hardly ever use a LNA amplifier without attenuating the signal so it is just some 6-10dB gain left, if the reciever are good, which a PCR2500 are.

Get a variable attenuator and adjust it for the best signal/noise ratio. Different scanners/receivers need a different amount of gain to not go into overload and loose sensitivity.

20dB variable attenuator.

You will need pigtails, recommended, or adaptors to suit your equipment and you might need one attenuator for each scanner or adjust a single one to adjust to the "worst" receiver that needs the lowest gain.

/Ubbe

Thank you Ubbe, I've order the variable attenuator. When will receive it I'll try with my setup, I hope to use the amplifier with Icom & sdr together

 

[dlwtrunked]

Thank you Ubbe, I've order the variable attenuator. When will receive it I'll try with my setup, I hope to use the amplifier with Icom & sdr together

I am glad you were able to order one--I was away for a while and did not see your request back to me. When needed I use some step attenuators that I got off eBay. I do use more gain that Ubbe suggests but I have invested heavily in notch filters to take care of the problems in doing that.