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
...
<EO_> ok you can do spectral-scan with an interface that's disabled!
<EO_> it wakes it up in read-only mode to scan
<nigelvh> Interesting
<EO_> so now I know it's safe to send signals into this modem and see wuddup
<EO_> wow, looks like ~3MHz RBW on spectral-scan!
<EO_> http://i.imgur.com/XWlgi3W.png <-- this is a screen shot of a pure sine wave
<EO_> LOL
<EO_> @ 910MHz
<EO_> http://www.bartk.us/dump/9HPn/910MHz-60dBm.png <-- same 910MHz pure sine wave @ -60dBm
<EO_> So now I wonder if that -40dBm or whatever 931MHz signal is causing the crazy floor
<EO_> -41dBm @ 929.7MHz <-- real world power QRM
<EO_> let's SEE how she reacts!
<EO_> bwahahaha YUP
<nigelvh> FLOOR DESTROYED
<EO_> http://www.bartk.us/dump/9HPn/929.7MHz-41dBm.png
<EO_> YUP
<EO_> worse than a porn star on efukt
<nigelvh> LAWL
<EO_> so now I know where my -60dBm noise floor came from
<EO_> question is, does it actually affect comms?
<EO_> or are these just false specan readings
* EO_ is not sure how to simulate that in the lab
<EO_> I know I did it before though.
<EO_> @ 5.8GHz
<EO_> need me a splitter
<EO_> for 900MHz, with good port isolation
<EO_> yikes $90
<EO_> [eo@Base900] /interface wireless> set 0 tx-power=0
<EO_> note to self: this is minimum 9HPn power setting, and is actually +5.3dBm
<nigelvh> Alright, it's been about 45 mins: https://digitalnigel.com/wordpress/wp-content/uploads/2015/10/70CM_MaxHold_45mins.gif
<nigelvh> Granted, it's later in the evening.
<EO_> hmm yeah that's not very satisfying
<EO_> what's the huge peak @ 450?
<EO_> commercial?
<EO_> also the only isolators I have are for 5.3GHz :(
<nigelvh> That'd be my guess. It's there all the time.
<EO_> 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
<EO_> would feel a lot better with another 20dB isolation there so it's only -45dBm going back into the generator
<EO_> http://www.ebay.com/itm/RF-Isolator-800-MHZ-900-MHZ-Dual-section-SMA-high-isolation-SWEPT-Tested-/351321240799?hash=item51cc60b4df:g:-s0AAOSwZjJU3mct
<EO_> we have a winner
<EO_> now need a spleeetor
<carrar> someone is WINNING?
<allenp> a winrar is you
<EO_> 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
<EO_> we have another winner!
<EO_> looks like about 25dB of isolation
<EO_> should be all set now to do a simular QRM test
<EO_> with 9HPn
<EO_> simulated
<EO_> Si4113-D-GM PLL https://www.silabs.com/Support%20Documents/TechnicalDocs/si4133.pdf
<EO_> LO freq = 1.545GHz
<EO_> fascinating.  if the interface is disabled, it doesn't even do RX mixing
<EO_> you gotta put it at least into scan mode
<EO_> LO freq stays fixed
<EO_> 929.7MHz gets up-converted via 1.545GHz LO to 2.4747GHz
<EO_> looks like only 6dB conversion loss in the whole chain, including my coax!
<EO_> -70dBm sig gen becomes .. uhhh -64dBm after the mixer?
<EO_> whoa this up-converter chip has positive conversion gain!
<EO_> 8dB @ 2.4GHz
<EO_> damn.  the IF compression point of that mixer isn't until it is fed with -10dBm
* EO_ verifies
<EO_> yeah, it's all linear
<EO_> So it's just the Atheros TRX chip freaking out? :(
<EO_> hmmm harmonic @ 2.1603
<carrar> odd
<EO_> 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
<nigelvh> EO_: responded to your email
<EO_> nigelvh: responded to your email
<EO_> I am encouraged by the fact you can see the individual solder paste balls in your footage
<nigelvh> Really? Features on the edge of resolution from what you saw in my video?
<EO_> Although the camera seems to be defocused
<EO_> yup
<nigelvh> That's suprising.
<EO_> They used some extremely tiny parts here
<nigelvh> And yes, the focus is adjustable.
<EO_> ok cool
<EO_> I should really own a usb microscope
<EO_> the tiniest labels are laser-etched into metal
<EO_> I can't make them out by eye, or with my magnifying glass
<EO_> also wanna stitch a high rez front+back pair of photos for documentation
<EO_> 4.7GHz fT measured!

<EO_> thayward: basically there are 2 strong carriers around 930MHz
<EO_> thayward: when you feed a -40dBm carrier @ 930MHz into the 9HPn, it gets seen as a broadband noise floor rise when running scan-spectrum
<EO_> thayward: I checked the analog front-end, and it's NOT clipping.  The RX mixer is good up to like 0dBm
<thayward> so, it turns out the 9HPn doesn’t make as good of a spec-an as your spec-an?
<EO_> It's looking like the signal spread is taking place inside the AR9832 chip
<EO_> So then the question is, is the spreading REAL, and actually affecting comms below 930MHz?
<EO_> Or is it just an artifact of the way scan-spectrum works and it doesn't affect normal comms at all?
<EO_> I have hardware on the way to answer this question.
<thayward> and if yes, can we filter it? Lots of high power stuff on both sides of 900 MHz
<EO_> yeah, it'd be tough
<EO_> and it'd raise cost even more
<EO_> 900MHz is already gonna be way more expensive :(
<EO_> (station cost that is)
<EO_> base modem is $108 vs $96 for 5SHpn
<EO_> so that's +$12
<EO_> Then you'll need an amp ($100-$200)
<EO_> then if you add a filter that's another $100
<thayward> can’t do ham radio without an amp
<thayward> antenna?
<EO_> impossibru!
<EO_> antenna is reasonable.  About $50 for the tenna, $50 for mag mount.
<EO_> If you want yagi/stationary, those are reasonable too
<thayward> 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/
<EO_> So yeah, looks like top spec station would cost you $400, plus antenna.
<EO_> I'd raelly love to avoid the filter
<EO_> drop it to $300

<EO_> Some Say(tm) it achieves 50dB isolation
<EO_> Some Say(tm) 9HPn can take 0dBm RX without damage
<EO_> Some Say(tm) +46dBm - 50dBm = -4dBm :D
<thayward> add a bit of insertion loss
<thayward> you’ll be fine
<EO_> yeah, I'll have a 2nd set of TRX switches on the low power side that can further shunt that -4dBm to ground
<EO_> or to a 50 ohm load
<EO_> even better, less distortiony
* EO_ wonders how to measure 900MHz-carrying switching events with a sampling scope

<EO_> heh, the filter in the 9HPn is rated for a max of +10dBm
<EO_> holy cow, 3dB insertion loss on it too!
<EO_> So it's a 2W radio with 1W output.  Silly.
<blueben> Yikes
<blueben> Isn't that the only TDMA capable 900mhz radio too?
<EO_> RX pad is 3 second period 50% square wave between 0V and 2.5V
<EO_> which seems to be altering the duty cycle of the TX pad
<EO_> between 4ms on / 2ms off and 10ms on / 2ms off
<EO_> tdma period size is set for 4ms
<EO_> the actual TRX switches are running at a steady 4ms period though
<EO_> with about 500us taken during each TX
<EO_> s/steady/jittery/
<EO_> the size of each frame seems to be varying a bit.  modem probably adding extra crap into the data once in a while.
<thayward> FEC?
<EO_> nah, FEC is constant
<EO_> also booo
<EO_> there is no phase correlation between TX pad and actual TRX signal
<EO_> cursed hidden layers
<EO_> can't trace signals

<EO_> carrar: you should find me the AR9283 spec sheet.
<EO_> zee pinz are too small to probe!


<EO_> allenp: sicence, bitch!!!  http://bartk.us/dump/9HPn/DSC_1298.JPG
<allenp> what is this?
<EO_> part of an 9HPn modem
<EO_> it would be swell if someone could find the data sheets for those ICs
* EO_ is finding it hard to do
<allenp> wonder what those dots mean
<EO_> good question
<EO_> I also don't know those package names
<EO_> apparently you have a better time finding the specs if you punch in marking code + package name
<EO_> allenp: wanna see the most insane text on this whole modem?
<allenp> yes
<allenp> I'll try anything at least 3 times
<EO_> http://bartk.us/dump/9HPn/DSC_1287.JPG <-- check out AKq1
<EO_> at the bottom
<EO_> would totally love to know what that part is too
<allenp> took me a while to find it
<EO_> it's so small you can't even find it!
<EO_> never mind its text!
<EO_> you can also see the stray solder ball in that photo :)
<EO_> it's a where's-waldo!
<allenp> well it was worth a shot http://i.imgur.com/zCyv7QS.png
<EO_> nice idea!
<EO_> the part # is F303
<EO_> so it's probably a Filter ?
<allenp> seems like a reasonable guess
<EO_> plus it's running along the RX signal path trace
<EO_> so it's seeing 900MHz signal there
<EO_> it's right before the upconverter chip
<EO_> RX signal goes left -> right along that trace
<allenp> you should do a live stream of reverse engineering circuits
<allenp> video inlays of the scope n shit
<allenp> mashup of eevblog and protonvids
<EO_> allenp: I was thinking of video'ing the QRM injection testing
<EO_> GOOD NEWS, EVERYONE
<EO_> ooh wow it's 1:30AM
<EO_> anyway, got it all on (boring) tape
<EO_> and the results are GOOD
<EO_> the spectrum-scan feature is just bogus
<EO_> the real comms are not nearly as affected by the interference signals as spctrum-scan would have us believe!
<EO_> yay!