At 2/23/2007 12:48, you wrote: >On 2/22/07, Ken Harrison <[EMAIL PROTECTED]> wrote: > > Our group is in need of replacing the receiver on our 220 box and I > > wanted to solicit some opinions from the group. > > > What are you using and are you happy with it? Would you buy any > > particular one again? Why or why not. > >Currently running a Kendecomm. Hate it.
Welcome to the club! >Pots are squirrelly (low quality) for any possible adjustment, the Yup. Replaced all of them in ours. >thing is impossible to work on in the rack - have to pull it out, >remove a billion screws, and put it back in -- it won't stay on >frequency... and it's installed in a temperature-controlled climate, >and the meters on the front have had something weirdly wrong with them >for years... trying to decipher them into useful information -- ain't >happenin'. One thing you can do with the RX is to ditch their bilevel squelch & retrofit a Micor squelch. The Kendecom squelch uses signal strength, not noise, to control their bilevel squelch. Problem with that is that the sig. strength is detected at the FIRST IF, NOT after the 455 kHz filter, so if you have any significant adjacent-channel signals, they can mess up the bilevel squelch & cause chopping. Even after installing the Micor squelch, there appears to be a problem with strong adjacent-channel signals (2 meters @ 15 kHz spacing) causing the squelch to close. I think it's due to excessive 1st IF gain, causing AMing in the IF. >I will be happy to pitch it off the side of something very very tall >as soon as... > >We're replacing it with a Mastr II conversion -- that supposedly I'm >doing -- well, I got the first one done and it's receiver is very >deaf... (starts to hear signal at 2uV -- no, not .2uV... 2!! >grrrr)... > >So I'm struggling through trying to figure out what went wrong... One of our local coordinating committee members had a similar problem converting a VHF HB MVP to 220. I think he said he ended up with a passband response in the front-end helicals that had excessive ripple, as if the phasing between helical sections got messed up. I'm going to undertake that task soon & will see if I have similar problems. Bob NO6B
