Bob, The specified torques on Andrew Bulletin 237458 REV A are the same for first and final tightening: 18-22 ft-lb.
73, Eric Lemmon WB6FLY KE5CTY Bob wrote: > Do the instructions mention anything about torque settings for > tightening versus re-tightening? > > TNX, > BOB > KE5CTY (old calls WB5ZQU - WY5L) > http://www.qsl.net/ke5cty > > > > -----Original Message----- > From: [email protected] > [mailto:[EMAIL PROTECTED] On Behalf Of Eric Lemmon > Sent: Wednesday, May 25, 2005 8:03 PM > To: [email protected] > Subject: Re: [Repeater-Builder] hardline connector generated IMD > > Skipp, > > Verrry interesting! By curious coincidence, the installation > instructions for the new Andrew Heliax connectors states that the > connector must first be tightened and then removed to inspect the flare > before re-tightening. I understand that the advice against re-using > connectors is probably directed toward re-use of connectors that have > been in service for some time, but the distinction should be made that > merely tightening the connector once does not necessarily preclude > tightening it a second time. (I, too, reuse expensive Heliax > connectors!) > > 73, Eric Lemmon WB6FLY > > skipp025 wrote: > > > I saw a Sinclair demo at IWCE Las Vegas last > > month about intermod from new & re-used > > hardline connectors. > > > > Wrong re-use & assembly of a typical hardline > > connector can be a serious IMD Generator, both > > new and used. Who would have thought..? > > > > The major idea that I can pass along to most of > > you is: Once you tighten a hardline connector > > down, you should not reuse the same hardline end > > position again. Cut off even the once used end > > section & start with a new un-used end. > > > > "Cut off the portion of the hardline which had the > > connector removed and place any new/used connectors > > on virgin hardline end-sections." It might be > > expensive or not practical, but it could save your > > bacon on a busy mountain top. PIM is a real > > Bxxxh (ryhmes with itch) to find and fix. > > > > The fly in the soup is the first-use grooves & > > scratches created in the hardline metal, which > > become serious PIM (Intermod) generators within > > the actual connector (both new and used). > > > > Some of you re-using old hardline might be shooting > > yourself in the foot right from the starting gate. > > Again, if you assemble a new or used hardline run, > > try to use new virgin cable ends only once. > > > > The real trouble is mostly sourced around the > > center pin connection in relation to the hardline > > in 7/8, 1-1/4, 1-5/8 and similar runs. But examples > > of 3/8, 1/2 and smaller PIM generators were given. > > > > One thing about the Sinclair RF Engineers, they > > really know their stuff well. Expensive but well > > worth their prices. If you visit the Sinclair web > > pages, notice they do specialize in antenna versions > > for problematic PIM sites. > > > > **** > > > > Not related to Sinclairs information, I will say that > > I do reuse some expensive connectors and hardline > > ends after inspection and cleaning. > > Said cleaning is with a brass or stainless brush. Stay > > away from steel cleaning brushes. > > > > That's about it... still trying to get that great > > Dayton hotdog tent smell out of my head. > > > > chow for now > > skipp > > > > skipp025 @yahoo.com > > www.radiowrench.com > > > > > > Yahoo! Groups Links > > > > > > > > > > > Yahoo! Groups Links > > > > > Yahoo! Groups Links > > > > 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/
