[Repeater-Builder] Sinclair Q202G duplexer Conversion

2007-12-25 Thread wpp3
Read the posts here already and wish to clarify a few things. First I
am in the process of converting a Q202G from the 160mhz range down
into the 2m band, specifically 144.7500/145.3500Mhz.  I have found
that I will need to replace the harness to do this as it will not tune
down that far.  

1.  I Understand I must make the harnesses at 1/4 wavelength each
between the cavities and from the cavities to the antenna T
connector.   What is the formula for the exact cable length?  i.e. 1/4
wavelength of freq * velocity factor of cable = cable segment length?

2. Are the lengths exactly the same for the low and the high sides or
are they dependent on individual frequency for each side.

3. Where is the measurement taken? From tip-to-tip of cable or from
center-of-T to center-of-T, etc?

4. In relation to #3 I will be using a N-Male/UHF-Female adapter on
each can. Then connecting the T to that adapter.  Will this affect
the cable harness length calculations and if so how?

Thanks in advance!

Best Regards,
 Bill - W4RVN



[Repeater-Builder] Motorola CDR500 link radio

2007-09-26 Thread wpp3
Does anyone know if it is possible to connect a link radio directly to
a CDR500 or will an external controller be needed.

Thanks,
   Bill - W4RVN