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Old 05-11-2015, 01:56 PM
DavGoodlin's Avatar
DavGoodlin DavGoodlin is offline
Motorola Minion
Join Date: Aug 2011
Location: near Strasburg PA
Posts: 2,837
Wanted: Switch Agile Modulator Channels

I got two Blonder-Tongue model MAVM-751 units, knowing I could move the MAVM's dip switches to different channels.
BUT - There is an Output Filter Module that is fixed by channel when the unit is ordered. It is a detachable tandem unit.
I would like to trade my channel 8 OFM (my strongest and local DT channel) for 3, 5 or 7, which are not used in this region.
I also have a channel 22, which is cable "I" just below channel 7 but nobody wants that, I may try to hack it to operate on channel 7 though.
"When resistors increase in value, they're worthless"
-Dave G
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Old 05-11-2015, 02:19 PM
Electronic M's Avatar
Electronic M Electronic M is offline
M is for Memory
Join Date: Jan 2011
Location: Pewaukee/Delafield Wi
Posts: 9,898
You might be able to get away with two generic parts as replacements. First would be a band pass filter that blocks all but the channel you wish to send, and a filter to block transmission line reflections. Reflections come from the antenna not exactly matching the 75ohm cable impedance, and if they are bad enough and not filtered out before they reach the output stages can damage or destroy the transmitter outputs.
Tom C.

What I want. -->

Reading between the scan lines since the mid 2000's.
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