http://cdn.macom.com/datasheets/DS-MAMX-007238-CM25MH_V6.pdf AR9283 2.4GHz TRX feeds this mixer https://www.anaren.com/sites/default/files/X3C09P1-03S_Datasheet_RevB.pdf used for splitter/combiner into 2 parallel amps http://www.vectron.com/products/saw/pdf_saw/TFS915A.pdf <-- main RF port filter http://www.cel.com/pdf/datasheets/upg2009tb.pdf <-- final RF switch, with cheap prices: http://www.aliexpress.com/item/UPG2009TB-E3-UPG2009TB-SOT363-G2U-RF-Switches/954776235.html http://www.cel.com/pdf/datasheets/upg2163t5n.pdf <- RX-side mixer switch near the AR9283 http://www.cel.com/pdf/datasheets/upc8172tb.pdf <-- RX side up-converter Si4113-D-GM PLL https://www.silabs.com/Support%20Documents/TechnicalDocs/si4133.pdf LO freq = 1.545GHz RX-side switch, right next to the AR9283 http://www.cel.com/pdf/datasheets/upg2163t5n.pdf SKY65111-348LF RF amplifiers: http://www.skyworksinc.com/uploads/documents/200428E.pdf If the interface is disabled, it doesn't do RX mixing, you gotta put it at least into scan mode. LO freq stays fixed. RX of 929.7MHz gets up-converted via 1.545GHz LO to 2.4747GHz. http://cdn.macom.com/datasheets/DS-MAMX-007238-CM25MH_V6.pdf AR9283 2.4GHz TRX feeds this mixer * EO_ wants to know why that specan feature in it sucks so bad ... ok you can do spectral-scan with an interface that's disabled! it wakes it up in read-only mode to scan Interesting so now I know it's safe to send signals into this modem and see wuddup wow, looks like ~3MHz RBW on spectral-scan! http://i.imgur.com/XWlgi3W.png <-- this is a screen shot of a pure sine wave LOL @ 910MHz http://www.bartk.us/dump/9HPn/910MHz-60dBm.png <-- same 910MHz pure sine wave @ -60dBm So now I wonder if that -40dBm or whatever 931MHz signal is causing the crazy floor -41dBm @ 929.7MHz <-- real world power QRM let's SEE how she reacts! bwahahaha YUP FLOOR DESTROYED http://www.bartk.us/dump/9HPn/929.7MHz-41dBm.png YUP worse than a porn star on efukt LAWL so now I know where my -60dBm noise floor came from question is, does it actually affect comms? or are these just false specan readings * EO_ is not sure how to simulate that in the lab I know I did it before though. @ 5.8GHz need me a splitter for 900MHz, with good port isolation yikes $90 [eo@Base900] /interface wireless> set 0 tx-power=0 note to self: this is minimum 9HPn power setting, and is actually +5.3dBm Alright, it's been about 45 mins: https://digitalnigel.com/wordpress/wp-content/uploads/2015/10/70CM_MaxHold_45mins.gif Granted, it's later in the evening. hmm yeah that's not very satisfying what's the huge peak @ 450? commercial? also the only isolators I have are for 5.3GHz :( That'd be my guess. It's there all the time. even with +5dBm through a 30dB attenuator, I'd still be shooting -25dBm back into the signal generator...which it may or may not like would feel a lot better with another 20dB isolation there so it's only -45dBm going back into the generator http://www.ebay.com/itm/RF-Isolator-800-MHZ-900-MHZ-Dual-section-SMA-high-isolation-SWEPT-Tested-/351321240799?hash=item51cc60b4df:g:-s0AAOSwZjJU3mct we have a winner now need a spleeetor someone is WINNING? a winrar is you http://www.ebay.com/itm/Mini-Circuits-ZAPD-21-Power-Splitter-0-5-2-0-GHz-SMA-Connectors-10W-50-Ohm-/271875040552?hash=item3f4d03e528:g:vU4AAOSwBahVW1-a we have another winner! looks like about 25dB of isolation should be all set now to do a simular QRM test with 9HPn simulated Si4113-D-GM PLL https://www.silabs.com/Support%20Documents/TechnicalDocs/si4133.pdf LO freq = 1.545GHz fascinating. if the interface is disabled, it doesn't even do RX mixing you gotta put it at least into scan mode LO freq stays fixed 929.7MHz gets up-converted via 1.545GHz LO to 2.4747GHz looks like only 6dB conversion loss in the whole chain, including my coax! -70dBm sig gen becomes .. uhhh -64dBm after the mixer? whoa this up-converter chip has positive conversion gain! 8dB @ 2.4GHz damn. the IF compression point of that mixer isn't until it is fed with -10dBm * EO_ verifies yeah, it's all linear So it's just the Atheros TRX chip freaking out? :( hmmm harmonic @ 2.1603 odd http://hamwan.org/t/RouterBoard+Metal+9HPn?structure=HamWAN new lab page! * EO_ goes to take some medium-rez pix * EO_ fails @ taking medium-rez pix EO_: responded to your email nigelvh: responded to your email I am encouraged by the fact you can see the individual solder paste balls in your footage Really? Features on the edge of resolution from what you saw in my video? Although the camera seems to be defocused yup That's suprising. They used some extremely tiny parts here And yes, the focus is adjustable. ok cool I should really own a usb microscope the tiniest labels are laser-etched into metal I can't make them out by eye, or with my magnifying glass also wanna stitch a high rez front+back pair of photos for documentation 4.7GHz fT measured! thayward: basically there are 2 strong carriers around 930MHz thayward: when you feed a -40dBm carrier @ 930MHz into the 9HPn, it gets seen as a broadband noise floor rise when running scan-spectrum thayward: I checked the analog front-end, and it's NOT clipping. The RX mixer is good up to like 0dBm so, it turns out the 9HPn doesn’t make as good of a spec-an as your spec-an? It's looking like the signal spread is taking place inside the AR9832 chip So then the question is, is the spreading REAL, and actually affecting comms below 930MHz? Or is it just an artifact of the way scan-spectrum works and it doesn't affect normal comms at all? I have hardware on the way to answer this question. and if yes, can we filter it? Lots of high power stuff on both sides of 900 MHz yeah, it'd be tough and it'd raise cost even more 900MHz is already gonna be way more expensive :( (station cost that is) base modem is $108 vs $96 for 5SHpn so that's +$12 Then you'll need an amp ($100-$200) then if you add a filter that's another $100 can’t do ham radio without an amp antenna? impossibru! antenna is reasonable. About $50 for the tenna, $50 for mag mount. If you want yagi/stationary, those are reasonable too FWIW, I’ve got one of these and it kicks ass on LTE. I haven’t tried 900. http://smile.amazon.com/Wilson-Electronics-700-2700-Directional-Connector/dp/B00J14YEHQ/ So yeah, looks like top spec station would cost you $400, plus antenna. I'd raelly love to avoid the filter drop it to $300 Some Say(tm) it achieves 50dB isolation Some Say(tm) 9HPn can take 0dBm RX without damage Some Say(tm) +46dBm - 50dBm = -4dBm :D add a bit of insertion loss you’ll be fine yeah, I'll have a 2nd set of TRX switches on the low power side that can further shunt that -4dBm to ground or to a 50 ohm load even better, less distortiony * EO_ wonders how to measure 900MHz-carrying switching events with a sampling scope heh, the filter in the 9HPn is rated for a max of +10dBm holy cow, 3dB insertion loss on it too! So it's a 2W radio with 1W output. Silly. Yikes Isn't that the only TDMA capable 900mhz radio too? RX pad is 3 second period 50% square wave between 0V and 2.5V which seems to be altering the duty cycle of the TX pad between 4ms on / 2ms off and 10ms on / 2ms off tdma period size is set for 4ms the actual TRX switches are running at a steady 4ms period though with about 500us taken during each TX s/steady/jittery/ the size of each frame seems to be varying a bit. modem probably adding extra crap into the data once in a while. FEC? nah, FEC is constant also booo there is no phase correlation between TX pad and actual TRX signal cursed hidden layers can't trace signals carrar: you should find me the AR9283 spec sheet. zee pinz are too small to probe! allenp: sicence, bitch!!! http://bartk.us/dump/9HPn/DSC_1298.JPG what is this? part of an 9HPn modem it would be swell if someone could find the data sheets for those ICs * EO_ is finding it hard to do wonder what those dots mean good question I also don't know those package names apparently you have a better time finding the specs if you punch in marking code + package name allenp: wanna see the most insane text on this whole modem? yes I'll try anything at least 3 times http://bartk.us/dump/9HPn/DSC_1287.JPG <-- check out AKq1 at the bottom would totally love to know what that part is too took me a while to find it it's so small you can't even find it! never mind its text! you can also see the stray solder ball in that photo :) it's a where's-waldo! well it was worth a shot http://i.imgur.com/zCyv7QS.png nice idea! the part # is F303 so it's probably a Filter ? seems like a reasonable guess plus it's running along the RX signal path trace so it's seeing 900MHz signal there it's right before the upconverter chip RX signal goes left -> right along that trace you should do a live stream of reverse engineering circuits video inlays of the scope n shit mashup of eevblog and protonvids allenp: I was thinking of video'ing the QRM injection testing GOOD NEWS, EVERYONE ooh wow it's 1:30AM anyway, got it all on (boring) tape and the results are GOOD the spectrum-scan feature is just bogus the real comms are not nearly as affected by the interference signals as spctrum-scan would have us believe! yay!