That is correct. See pic: [image: Inline image 1]
Now if I could figure out how to get that case open without destroying it in the process.... (note the broken edge on the left of the radio) -forrest On Thu, Jan 21, 2016 at 7:34 AM, Bill Prince <[email protected]> wrote: > I think he puts the banjo on the AP (on the bench). > > bp > <part15sbs{at}gmail{dot}com> > > > On 1/21/2016 6:28 AM, Josh Luthman wrote: > > So other end of the wire, not the AP... > > Josh Luthman > Office: 937-552-2340 > Direct: 937-552-2343 > 1100 Wayne St > Suite 1337 > Troy, OH 45373 > On Jan 21, 2016 8:54 AM, "Forrest Christian (List Account)" < > [email protected]> wrote: > >> With a 8P8C modular banjo and a 5 1/2 digit bench DMM.... just part of >> the standard test equipment in the lab. >> >> -forrest >> >> >> >> On Thu, Jan 21, 2016 at 5:58 AM, Josh Baird <[email protected]> wrote: >> >>> Thanks for the info! I'm going to see if I can crank my 24V DC-DC >>> converter up to ~29V at this site temporarily. It's too snowy at the >>> moment to rewire for 48V. How were you determining voltage at the AP? >>> >>> On Thu, Jan 21, 2016 at 2:43 AM, Forrest Christian (List Account) < >>> [email protected]> wrote: >>> >>>> A bit of an update from the PacketFlux side. >>>> >>>> Late this afternoon I received a ticket from Tyson in relation to these >>>> issues. In particular, sync from a PacketFlux SyncInjector dropping off on >>>> an ePMP when it's cold. I have spent a bit of time this evening >>>> investigating this issue. The following is a summary of what I found. >>>> It's a bit long-winded so that those experiencing the problems can >>>> understand my current working theory and help me figure out if this is the >>>> case. >>>> >>>> WARNING: The following is based on a limited amount of testing with a >>>> single ePMP with no traffic and no clients and on a bench. This is likely >>>> the best case scenario. The field is only going to be worse. >>>> >>>> The setup is as follows: >>>> >>>> ePMP 1000 GPS AP, with no GPS hockey puck attached, connected to a >>>> Gigabit Syncinjector (Rev H and Rev I - I have a special one with a port of >>>> each 'type' ;-) ). I am powering the injector with a variable power >>>> supply so I can vary the voltages in. The AP is connected to the Injector >>>> with ~100m of CAT5 cable. The Antenna connectors have terminators on >>>> them, the AP is in transmit mode, but isn't passing any traffic since there >>>> are no clients. >>>> >>>> When feeding the injector with 24V, I get about 23V at the AP. This >>>> is pretty consistent with what I would expect in this situation. The AP >>>> seems to work fine, at least on the bench and without doing any real >>>> work. However, as the voltage drops, things start to get weird: >>>> >>>> At around 22V in, (21V at the AP), Sync becomes flaky. This is >>>> consistent on both H and I version ports on the injector. Sometimes it >>>> works, sometimes it doesn't. Note that 22V is the bottom of the rated >>>> voltage inputs for the ePMP. >>>> >>>> At around 20.5V in (19.5V at the AP), the radio just turns off. It >>>> won't turn back on until around 22V. >>>> >>>> Now here's where some total speculation comes to play. On the bench, >>>> this unit is drawing around 3W. Let's assume that under load, and when >>>> temperatures are cold, this unit draws closer to 6W. This would double the >>>> current, and quadruple the voltage drop. Now, assume 24V in, this puts you >>>> at around 20V in at the AP, which is about the turnoff point. Remember >>>> this is on 100m of wire, and a total speculation about a the power draw of >>>> a cold, under load AP. But the point is valid, regardless of the cause - >>>> if the circuit resistance when combined with the power load causes a low >>>> enough voltage at the AP, weird things will happen. And since weird things >>>> seem to start to happen around 22V, there just isn't much headroom at >>>> 24V. >>>> >>>> This explains why things work well at 30V. >>>> >>>> For those who are having this problem I'd recommend trying increasing >>>> the voltage into the SyncInjector. The Revision H injectors can safely >>>> handle up to around 56V or so. Assuming all of the radios on an injector >>>> are either ePMP or the newer 450i's, using 56V into a SyncInjector is >>>> perfectly acceptable and the ePMP's are rated up to 56V as well. >>>> >>>> So the summary: Try a 48VDC voltage source instead of 24V and see >>>> what happens. >>>> >>>> -forrest >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> On Wed, Jan 20, 2016 at 11:00 AM, Tyson Burris @ Internet >>>> Communications Inc <[email protected]> wrote: >>>> >>>>> Hello Cambium, >>>>> >>>>> >>>>> >>>>> At the MidWest-IX launch party last night, several of us Indiana WISPs >>>>> compared notes on the ‘cold weather’ problems we are seeing with ePMPs. >>>>> It >>>>> was very interesting to learn we are experience identical problems across >>>>> the spectrum. >>>>> >>>>> We all understand this is a DRAM issue with certain units you have >>>>> identified. We also understand the firmware RC that has been made >>>>> available to fix this short term. >>>>> >>>>> The bottom line is we are very frustrated and grow tired of dealing >>>>> with it. >>>>> >>>>> >>>>> >>>>> Our concern is simple. If your software fix ‘degrades’ the >>>>> performance of the product or triggers other issues, as it has been >>>>> suggested, we would prefer a full recall and replacement program >>>>> immediately. >>>>> >>>>> >>>>> >>>>> If the suggestion that the fix will degrade the product performance is >>>>> inaccurate and not cause other issues, I would like for this to be made >>>>> public. >>>>> >>>>> >>>>> >>>>> Thank you, >>>>> >>>>> >>>>> >>>>> *Tyson Burris, President* >>>>> *Internet Communications Inc.* >>>>> *739 Commerce Dr.* >>>>> *Franklin, IN 46131* >>>>> >>>>> *317-738-0320 <317-738-0320> Daytime #* >>>>> *317-412-1540 <317-412-1540> Cell/Direct #* >>>>> *Online: * <http://www.surfici.net>*www.surfici.net >>>>> <http://www.surfici.net>* >>>>> >>>>> >>>>> >>>>> [image: ICI] >>>>> >>>>> *What can ICI do for you?* >>>>> >>>>> >>>>> *Broadband Wireless - PtP/PtMP Solutions - WiMax - Mesh Wifi/Hotzones >>>>> - IP Security - Fiber - Tower - Infrastructure.* >>>>> >>>>> *CONFIDENTIALITY NOTICE: This e-mail is intended for the* >>>>> *addressee shown. It contains information that is* >>>>> *confidential and protected from disclosure. Any review,* >>>>> *dissemination or use of this transmission or its contents by* >>>>> *unauthorized organizations or individuals is strictly* >>>>> *prohibited.* >>>>> >>>>> >>>>> >>>> >>>> >>>> >>>> -- >>>> *Forrest Christian* *CEO**, PacketFlux Technologies, Inc.* >>>> Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602 >>>> <[email protected]>[email protected] | <http://www.packetflux.com/> >>>> http://www.packetflux.com >>>> <http://www.linkedin.com/in/fwchristian> >>>> <http://facebook.com/packetflux> <http://twitter.com/@packetflux> >>>> >>>> >>> >> >> >> -- >> *Forrest Christian* *CEO**, PacketFlux Technologies, Inc.* >> Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602 >> <[email protected]>[email protected] | <http://www.packetflux.com/> >> http://www.packetflux.com >> <http://www.linkedin.com/in/fwchristian> >> <http://facebook.com/packetflux> <http://twitter.com/@packetflux> >> >> > -- *Forrest Christian* *CEO**, PacketFlux Technologies, Inc.* Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602 [email protected] | http://www.packetflux.com <http://www.linkedin.com/in/fwchristian> <http://facebook.com/packetflux> <http://twitter.com/@packetflux>
