At 3/16/2005 10:04 PM, you wrote:
>Helicals are great, small little filters. But they are lossy because
>of their small size so you need to follow with a Amplifier, This is
>already done in the front end assembly, MASTR-II VHF uses 5 helicals
>and then an amplifier and another 2 helicals, if I remember correctly.
Not quite. The 5 helical resonators feed a JFET mixer, filtering the
signals from the RF input. The other two also feed that mixer but are LO
filters (the UHF version has 3 - easiest way to tell what band a G.E. radio
is on if it's missing the model # plate). There is no amplification at RF
in a stock Mastr II RX.
Bob NO6B
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/Repeater-Builder/
<*> To unsubscribe from this group, send an email to:
[EMAIL PROTECTED]
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
