Steve,
I gotta admire a guy who is willing to do all of the engineering calculations
for duplexer jumper cables! The optimum jumper length must consider the
length of the loops that are within the cavities. However, in this particular
case, Sinclair has already done the hard part.
Sinclair fabricates the Q-202G harness as a complete assembly using crimp
connectors and tees, with RG-214/U double-shielded cable. You can use RG-400/U
cable if you account for the slight difference in velocity factor. Keep in
mind that Sinclair can meet their Q-202G specs over the entire 138-174 MHz
band, using only
two harnesses, so the lengths are not supercritical.
The standard harness for the 150-174 MHz band measures about 12" between the
centers of the cavity tee connectors. The harness for the 138-150 MHz band
measures about 14" between centers. You can purchase the harness directly from
Sinclair for about $120. Visit www.sinctech.com for more information.
73, Eric Lemmon WB6FLY
> ---- Steve Rodgers <[EMAIL PROTECTED]> wrote:
> The way I plan to estimate the cable lengths is to do a lambda/4 calculation
> for 146MHz, and multuiply it by the velocity factor for RG400 to yield the
> true length. This is what I was able to glean from the Sinclair
> documentation. Is there anything else I need to consider?
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/
