SDrtrunk missed transmissions

[Bonkk083]

I am monitoring two sites with one SDRplay RSP1B it gets the 10MHz but one site the aliases I miss transmissions are pick up are don't show slow but when I adjust the LNA or RF gain or move the ppm it picks up then after a few times then I have to do the same and I tried it just with just one site and does the same thing, What might be the problem?

 

[Whiskey3JMC]

Post a screenshot of your spectrum window and tuner settings

 

[Bonkk083]

Post a screenshot of your spectrum window and tuner settings

 

[Whiskey3JMC]

PPM is way too high. You'll want to adjust that down to get the measured error as close to zero as possible

 

[Bonkk083]

PPM is way too high. You'll want to adjust that down to get the measured error as close to zero as possible
View attachment 183442

Change where it has 1.9 should it be 0 I just changed it but I got it to -0.2ppm

 

[Whiskey3JMC]

Change where it has 1.9 should it be 0 I just changed it but I got it to -0.2ppm

This number (Measured Error) needs to be as close to zero Hz as possible (it will jump up and down in small increments once set) so adjust the PPM number up or down accordingly until you find a sweet spot close to zero

 

[Bonkk083]

View attachment 183446
This number (Measured Error) needs to be as close to zero Hz as possible (it will jump up and down in small increments once set) so adjust the PPM number up or down accordingly

I got it to 9 but it jumps to -51, -30 to -28

 

[Whiskey3JMC]

I got it to 9 but it jumps to -51, -30 to -28

Great. Any difference with the decode?

 

[Bonkk083]

Great. Any difference with the decode?

Still missing transmissions adjusting the rf gain

 

[C_615]

Make sure the enable decoder to auto adjust ppm box is unchecked. Type in 0 in the PPM box.

 

[Whiskey3JMC]

Make sure the enable decoder to auto adjust ppm box is unchecked.

It's unchecked in the OP's screenshot

 

[Whiskey3JMC]

Still missing transmissions adjusting the rf gain

What are you using as an antenna? Is it indoors or outdoors & does it adequately cover 800+mhz? How far are you from the target station(s)?

 

[Bonkk083]

What are you using as an antenna? Is it indoors or outdoors & does it adequately cover 800+mhz? How far are you from the target station(s)?

The antenna is a PCTEL BMYD8060 14dbd yagi the station is 19 miles, when it picks up it sounds really good

 

[dave3825]

I am monitoring two sites with one SDRplay RSP1B it gets the 10MHz but one site the aliases I miss transmissions are pick up are don't show slow but when

Just because its 2 sites, that really does not mean anything. What matters is the freq range of each site and how close those ranges are.

I tried it just with just one site and does the same thing, What might be the problem?

What is the highest freq between both sites?
What is the lowest freq between both sites?




Gain is way too high.


Also, never see my SDRT displaying anything in the Alias or To column on the control channel row.

 

[Bonkk083]

Just because its 2 sites, that really does not mean anything. What matters is the freq range of each site and how close those ranges are.



What is the highest freq between both sites?
What is the lowest freq between both sites?




Gain is way too high.


Also, never see my SDRT displaying anything in the Alias or To column on the control channel row.


View attachment 183588

851.0375 to 860.4625

 

[dave3825]

Not sure how much true usable bandwidth the RSP offers but cutting it kinda close




I would set the minimum and maximum in the tuners tab. I would try 851.000 to 860.500. Should keep the dongle in that range.

Is anything available higher in sample rate than 10.00mhz? If so, do as said above and try 12.00 MHz.

 

[Whiskey3JMC]

Not sure how much true usable bandwidth the RSP offers but cutting it kinda close

10MHz usable

 

[mtindor]

10MHz usable

Doesn't sound right. Every SDR I've known has falloff 10% on either side.

Typically at 2.4 msps you get 1.92 mhz, 6 msps you get 4.8 mhz, 10 msps you get 8 mhz. At least this is true for dongles and Airspys. I would not imagine the RSPs to be any different, but they could be.

 

[dave3825]

So Sdrplay says 10 but it seems it’s most likely like Airspy, HackRf and rtl sdr etc which have some rolloff.

 

[Bonkk083]

So Sdrplay says 10 but it seems it’s most likely like Airspy, HackRf and rtl sdr etc which have some rolloff.

View attachment 183668

My Airspy R2 gets all of the frequencies