SDS200 This is what cell phone tower interference looks like.

[Anderegg]

Parked at my station under our parking lot mounted 100 foot cell tower...the local city 700MHz LSM Phase 1 trunking system coming in at an amazing -30dBm, with digital errors as high as 50. Thank you 4G. :-|

 

[Ubbe]

You will probably not see that using other scanners than the SDS series. To get more or less perfect reception of simulcast systems you have to sacrifice other performancies in SDS scanners. The perfect scanner have not yet been produced.

/Ubbe

 

[n1chu]

I thought RSSI readings were inaccurate, at best unreliable? -30DBm is a nice reading but is it a true reflection of the actual signal you want, or other splurious entities in a high rf environment? And the error rate... how did that affect the ability to hear? Was it unreadable? (I’m running under the idea these two readings are “ballpark” values, possibly not all that much accurate?)

 

[Anderegg]

This cell tower will fade an APX at our main gate, which is in the radiation beam path of a few of the arrays! The SDS was below and out of the beam, but still...4G is a *****.

Paul

 

[kb5udf]

I wonder if you have the same issue I do in a few locations, First net down around 768 (give or take) and below). Giant wall-o-noise I can see on an SDR

 

[prcguy]

Here is what I pick up from a cell tower about 250yds away. This is at the end of a 75ft run of coax so the signal is well above 0dBm out of the tower mounted preamp.

 

[R0am3r]

You will probably not see that using other scanners than the SDS series. To get more or less perfect reception of simulcast systems you have to sacrifice other performancies in SDS scanners. The perfect scanner have not yet been produced.

/Ubbe

So only the SDS series radios are affected by cell tower transmissions while standing under the tower? Nice generalization.

 

[900mhz]

Here is what I pick up from a cell tower about 250yds away. This is at the end of a 75ft run of coax so the signal is well above 0dBm out of the tower mounted preamp.

View attachment 93141

Is that in peak hold, or free run?

 

[R8000]

So only the SDS series radios are affected by cell tower transmissions while standing under the tower? Nice generalization.

My Whistler 668 just gives up on 700-800 MHz when I am within a mile or so of a cell tower. I never connected the dots until I was trying to monitor a analog 800 MHz smartnet system and heard it with my own ears. The noise floor just rose until the point the thing just stopped receiving.

 

[prcguy]

Peak hold.

Is that in peak hold, or free run?