Radio scanner??

[Pete_kaye]

I was given this without an aerial but not sure how to test it now I have made an aerial. Some kind of security radio checker. Would it be of use to us venarable people?

[Andrew2]

Possibly a bug-sweeper intended to find listening devices in hotel rooms etc. If you don't have a sig gen, I wonder if it'll pick up the local osc in an FM portable?

[Pete_kaye]

It is made by Cooper security , I have just noticed on the back.

[Pete_kaye]

All Cooper security could tell me was that it operates at 868MHz.Part no 790reur-00. Any use to anyone?
I recently walked around a large university and the top light came on and a hiss when switched to Audio.

[Tom_I]

This is a hand-held signal strength meter for carrying out a site survey prior to installing a wireless intruder alarm system. You place a matching transmitter where you plan to install the main receiver/control panel, then tour the site measuring the signal strength at each point where you plan to fit a wireless detector unit.

Here's an excerpt from the instruction manual:

Radio Site Survey

It is very difficult to predict exactly, just by looking at a site, how well the transmitters and receivers of a wireless alarm installation will perform. Cooper Security strongly recommend that you measure the radio environment at a site before you start the installation.

Site Survey With The 790r

The 790r signal strength meter is specifically designed to help you carry out a radio site survey at 868MHz. The 790r works with a test transmitter, the 734REUR-01, that you place at the position you think will work for the receiver. When you switch the transmitter on you can tour the site with the 790r and measure how strong the signal is at each of your proposed transmitter locations.

This procedure works because radio waves do not care in which direction they travel along a particular path. They will experience the same conditions going from A to B as they do going from B to A.

The front of the 790r shows graphically the strength of the signal it picks up from the test transmitter. The 790r and 734 are calibrated so that they show signal strength in “units”. Cooper Security recommend that for the best operation of any 868MHz device the 790r should show between four and nine units of signal strength.

[G6Tanuki]

868MHz is pretty much a "free-for-all" spectrum-slice - used for a whole range of wireless-devices (intruder-alarms, some voice-comms, and - my favourite - frozen-food-cabinets in supermarkets so they can 'call home' and signal a panic if the Häagen-Dazs or Ben&Jerry's is about to go into meltdown.

https://en.wikipedia.org/wiki/Short_...Devices#SRD860

Your thing is a "sniffer" to tell if there are other occupiers of the channels in the locality.

[mole42uk]

Originally Posted by G6Tanuki

frozen-food-cabinets in supermarkets so they can 'call home' and signal a panic if the Häagen-Dazs or Ben&Jerry's is about to go into meltdown.

Surely that scenario rates an emergency call to the breakdown service?

[Radio Wrangler]

That IS the emergency call to the breakdown service.

David

[Phil G4SPZ]

I think there are a number of specific channels in the 868MHz band. Devices hunt for a free channel, a bit like cordless phones do.