The 820C does have dual radios in it. But, it has two separate waveguide interfaces on the radio. You can either mount the radio to a "Splitter" that combines the two carriers using the same polarization, or an OMT which combines the two carriers on alternate polarizations. Then you have a circular adapter on the antenna so you can use both polarities. You can see examples in the PTP820c installation guide at: http://www.doubleradius.com/c.283276/site/stores/cambium/Cambium-PTP-820C-Installation%20Guide.pdf
In particular, page 2-7 shows all the parts. On Tue, Oct 25, 2016 at 9:44 AM, Ken Hohhof <af...@kwisp.com> wrote: > If it’s an 820C, isn’t that dual core, meaning 2 radios in one unit, no > separate combiner needed? > > > > *From:* Af [mailto:af-boun...@afmug.com] *On Behalf Of *Bill Prince > *Sent:* Tuesday, October 25, 2016 10:27 AM > > *To:* af@afmug.com > *Subject:* Re: [AFMUG] UT Local Ceragon Installer > > > > Are the two radios mounted through an OMT or such? Did they happen to > switch which one is V and which one is H? > > > > bp > > <part15sbs{at}gmail{dot}com> > > > > On 10/24/2016 8:06 PM, Sterling Jacobson wrote: > > Well, worst case scenario someone along the way f’ed up the hardware and I > would need the same installer(s) to know enough to tell me I need a new > part or whatever. > > > > They did take apart the mount and maybe even the antenna from the radio in > order to shift it to left or right hand mount. > > So there is a possibility something happened when they did that. > > > > This link WAS working from the same mountain tower to a slightly different > location about the same distance just on one polarity for over a year. > > Because of licensing, I had to have the radio pair removed, and moved to > opposite locations, with some storage in between time etc. > > > > I’m going to be super pissed if something happened physically to the > radios or dishes. > > But at the moment everyone working on it so far is too stupid (including > myself) to know the difference between config/aim and hardware issue. > > > > I’ll still pay to have someone competent tell me that everything is all > good except that I need a part fixed, IF they can discern that with > confidence. > > > > > > *From:* Af [mailto:af-boun...@afmug.com <af-boun...@afmug.com>] *On > Behalf Of *Ken Hohhof > *Sent:* Monday, October 24, 2016 9:00 PM > *To:* af@afmug.com > *Subject:* Re: [AFMUG] UT Local Ceragon Installer > > > > Misalignment will almost always affect both directions. Yes, on a > licensed link the 2 directions are different frequencies, but not that > different. > > > > What you describe sounds kind of like a bad radio, or a configuration > problem. Like xmt power set wrong on one end, or a xmt frequency out of > range of the diplexer. I’m not familiar with Ceragon ordering, but I > assume they have different diplexers for different sub bands. > > > > > > *From:* Af [mailto:af-boun...@afmug.com <af-boun...@afmug.com>] *On > Behalf Of *Sterling Jacobson > *Sent:* Monday, October 24, 2016 9:45 PM > *To:* af@afmug.com > *Subject:* Re: [AFMUG] UT Local Ceragon Installer > > > > That’s probably exactly what happened. > > > > They spent hours on it and were still way off on dB on one side only. > > That’s why I assume the other side is angled or rotated too far (dual > polarity X-Pic). > > > > One guy didn’t even use the volt meter, just had someone read dB from the > web page. > > > > They didn’t even ask for angles, degrees, nothing. > > Just all by supposed line of sight, no scopes, and not even binoculars I > think. > > > > I wasn’t too happy about the whole situation, so I don’t want a repeat of > that. > > > > It’s less than 10 miles across Utah Lake, one end on a leg on a tower on > top of a mountain, the other on a smaller tower attached to concrete wall > near the freeway. > > > > > > *From:* Af [mailto:af-boun...@afmug.com <af-boun...@afmug.com>] *On > Behalf Of *Ken Hohhof > *Sent:* Monday, October 24, 2016 8:38 PM > *To:* af@afmug.com > *Subject:* Re: [AFMUG] UT Local Ceragon Installer > > > > Are these big dishes? Did you not get a well defined peak during > alignment? Is the signal more than a couple dB less than predicted, like > 20-30 dB low? You’re on a sidelobe. I’ve had experienced tower guys run > into this. They tend to be stubborn and believe they can align a dish with > a 1 degree beamwidth by eye, and then they spend half an hour trying to > tweak the alignment to get an extra 1 dB when they’re 20 dB off. Once the > signal starts getting worse, they go back the other way instead of > continuing. Convince them to do a wide sweep, and they find the main > lobe. You have to go through the valley to find the mountain. > > > > > > *From:* Af [mailto:af-boun...@afmug.com <af-boun...@afmug.com>] *On > Behalf Of *Sean Heskett > *Sent:* Monday, October 24, 2016 9:14 PM > *To:* af@afmug.com > *Subject:* Re: [AFMUG] UT Local Ceragon Installer > > > > The angle of the leg shouldn't matter...at most you'd loose ~3db but it'd > have to be almost at a 45* angle for that. (Chuck did a demo at one of the > animal farm events) > > > > If you can get me remote access I can look at the config for ya. They are > very un-intuitive to say the least lol. > > > > -Sean > > > > On Monday, October 24, 2016, Sterling Jacobson <sterl...@avative.net> > wrote: > > I need to get my Ceragon link running, it's been forever. > > I think someone on this list had offered me their service local to Utah > for this. > I am paying for this, either by Job or by hour. > > If you remember offering, and it's you, or you think you would like to > help, then let me know. > > I've got the link installed on both sides and configured, just something > not lined up or configured correctly. > > The local guys I used originally earlier this year couldn't figure it out. > And I think the mountain side link is not mounted true and needs a proper > mounting on the leg, or hardware to mount it true, not on the leg at an > angle. > > >
