Mathew, I have a DB4072, the 6 cavity in the chassis/box, that was tuned by DB Products to 503 MHz. We retuned to 443/448 MHz with no problem or changes.
As with most all duplexers the cabling is cut to length to get best performance so would be best if had correct cabling, but this might be little hard to replace with all the BNCs. We typically see about a 5 db improvement with proper cables, but will work especially at 30 watts. We do cut the internect cable from tx and rx to multiple 1/2 wave lengths. 73, ron, n9ee/r --- In Repeater-Builder@yahoogroups.com, "n9lv" <[EMAIL PROTECTED]> wrote: > > I have a fellow ham who has a set of DB 4072 duplexers, wants to use > them on a 440 repeater at about 30 watts output. Has anyone any > expierience tuning these duplexers, and how well if they will, work. > They are currently set on 463 Mhz, and are designed for 450-470 Mhz. > > Thanks. > > Mathew >
