I was taught to avoid N connectors above 6 GHz...SMA up to 18GHz .. On Feb 3, 2016 11:38 AM, "Ken Hohhof" <[email protected]> wrote:
> How tight is “fully tight”? > > I was taught hand tightened or equivalent, rather than put a wrench on it > and crank it until it bottoms out. Is that wrong? SMA connectors seem to > have a more pronounced stop when they’re tight. > > > *From:* Chuck McCown <[email protected]> > *Sent:* Wednesday, February 03, 2016 12:35 PM > *To:* [email protected] > *Subject:* Re: [AFMUG] weird problem > > Yeah, it is interesting to watch a N connector on a network analyzer set > for return loss/VSWR/reflection coefficient. > It gets better with every turn and keeps on improving right up to the last > bit of movement. Anything less than fully tight is causing a problem. > > *From:* Sean Heskett <[email protected]> > *Sent:* Wednesday, February 03, 2016 11:30 AM > *To:* [email protected] > *Subject:* Re: [AFMUG] weird problem > > 3/4 of a turn on an N connector is a lot. You were probably loosing a lot > of RF out that port. > > > On Wednesday, February 3, 2016, Dan Petermann <[email protected]> wrote: > >> We have two 11GHz links on the same freqs. One V and one H pol. These are >> dual links, 2 - 40Mhz channels. The radios are Dragonwave, one Quantum and >> the other a Horizion Duo. >> >> We had to replace the IDU of the Quantum with a DUO and put the link into >> DUO compatibility mode. >> >> After replacing the IDU, we started having issues on the other link. The >> RX levels of one freq dropped by 9dBm, the equalizer stress jumped to 150 >> (should be under 100), and the link would only run at 32QAM. >> >> This morning I moved the IDU up 1 RU (it was sitting directly onto of the >> other IDU) and tightened the coax by 3/4 of a turn. Gained 9dB, lowered >> equalizer stress by 50, and now running at 256QAM. >> >> I check the IF freqs and they were separated by 200MHz. >> >> I’m curious, does anyone have an idea why this happened? > >
