The Panasonic door box, with a separate condenser mic and speaker, generally performs better than the Viking units I'v used, which use a 32 ohm speaker for both transmit and receive.
In some cases where we needed more volume, we used an alarm horn speaker (Elk SP-40) (www.elkproducts.com) to replace the Panasonic speaker. These are much more efficient, and more directional, and can provide more volume without any additional electronics- just clip out the speaker and connect the wires to the horn speaker instead, and point the horn at the user (if there is a doorway, mount the horn overhead and aim it down). Another option if you need even more volume is the Viking M2W Paging Amplifier, which also ties to the speaker leads. Orrin Charm InfiniSys > Hi all, > >I posed this question of "noise cancellation" last week and ran all tests > including a temporary wire. On this same wire, when held indoors, volume > excellent, As soon as we go outdoors, Intercom box cannot hear conversation > from inside phone.Inside phone hears Door box OK. > > > >My question is .... has anyone found another system, possibly the Viking, > using a spare CO line which is available, that might have less noise > canceling or louder or adjustable door box volume or a way to boost the > door box volume. > >The environment is a busy 4 lane local road and 100' from I95 passing > overhead with the bridge over the main road within the 100'. Yes ... a lot > of background noise. Customer is afraid of handset type as vandalism might > be a problem. > > > >Another thought, some sort of baffle box around the door intercom box??? > > > >Thanks guys. Have a great day. > > > >Bob Bruskin > >Halstead Electronics Ltd. > multipart/alternative text/plain (text body -- kept) text/html _________________________________________________________________ KX-T Mailing list --- http://kxthelp.com/ Subscription changes: http://kxthelp.com/mailman/listinfo/kxt
