Ahh... someone mentioned the much loved Cetec Vega Equipment... Steve... I found a Cetec Vega Manual Binder at a local ham swap and it has all the diagrams for this type of equipment. It is my intention to pdf scan it for the RB page some day. Choked full of the much coveted cetec vega circuits, which can be cloned simple enough.
I seem to remember some motorola tone remotes having some pretty nice/deep notch filters on board. They were often made in the metioned lumped toriod inductor format and they worked much better in problem locations vs the eventual op-amp types, which later replaced a lot (but not all) of them. The mentioned of lumped toroid inductors brings back early tone and teletype "rtty" filter memories with surplus 88mH coils, which were probably the same standard L-values used in many commercial designs. Those of you going back far enough will remember buying them from Poly-Paks (rip)? Enough surplus commercial radio tone remotes are around that you could easily and cheaply find these parts surplus for almost no real money. In size restricted applications... I replace the large filter units with Selectone (rip) clones I build... or Bill also offers up the good idea of the Norcom units of which I also have & use. Just depends on how bad you need the tone removed... cheers, skipp > "Steven Samuel Bosshard \(NU5D\)" <[EMAIL PROTECTED]> wrote: > Dave, in days gone by I purchased some filters to remove 2175 hz > used in tone remote keying in wireline remote control of base > radios. The filter removed the hold tone from the voice path. > They were manufactured by Cetac Vega company - seems like in > Washington State and consisted of a toroid coil and associated > capacitors. You might also find a similar audio notch filter in > surplus station cards used in Motorola Micor / Motrac, etc > stations that had tone remote control. I hope this helps. > Best 73, Steve > NU5D >
