How long can I record internally?

[Anderegg]

Want to manually record an entire 9 hour shift on a LE dispatch talkgroup. How big of an SD card is necessary to allow this...with typical amount of busy radio traffic?

Paul

 

[hiegtx]

I recorded several days of very active radio traffic on my HP-1, during & after the ambush that cost the lives of 5 police officers in Downtown Dallas back in 2016. Didn't make much more than a 'dent' in the 8gb card in that scanner. If I recall, it was a bit less than 500mb worth of audio.

 

[KK4JUG]

Why don't you record an hour's worth then see how much space is used on the card and figure it from that? Remember, the usable capacity of the cards is a little less than the listed capacity.

 

[Anderegg]

Thanks guys

Paul

 

[Ubbe]

SD card is necessary to allow this...

The audio files are saved with a 128kilo bit per second rate. SD cards are specified at a giga byte size. One byte equals 8 bits.

9 hours are 32.400 seconds and needs to be multiplied with 128.000 and the sum to be divided by 8 to get the SD card memory size in bytes.

518MB memory are needed

/Ubbe

 

[KK4JUG]

Well, there you go. Ubbe has done the math.

 

[JoeBearcat]

The audio files are saved with a 128kilo bit per second rate. SD cards are specified at a giga byte size. One byte equals 8 bits.

9 hours are 32.400 seconds and needs to be multiplied with 128.000 and the sum to be divided by 8 to get the SD card memory size in bytes.

518MB memory are needed

/Ubbe

And that assumes 100% on-air time. Odds are it will be much less than that, as when there is no transmission the record uses 0 bytes.

As others have said, try it.

 

[Anderegg]

A 9 hour shift ended up with roughly 1 hour of recorded active voice audio files.

Paul

 

[Anderegg]

A 9 hour shift ended up with roughly 1 hour of recorded active voice audio files.

Paul

 

[Ubbe]

And that assumes 100% on-air time.

There are also a header to each file with information that adds almost 1KB of data space to each audio file. But the point is that there's no such small SD card available that could not hold a 9 hour recording. Uniden have fixed the slow down of scanner operations when the SD card fill up with recordings, but it is still a delay in button push detection when the memory fills up that force you to empty the SD card long before even a small 4GB size card fills up.

I recommend to use the Universal Scanner Audio Player by deim to evaluate scanner recordings.

/Ubbe