 compressor activation at 10-minute intervals.
I can't provide decibel-calibrated sound pressure levels (and since I don't have access to the equipment, I can't measure the actual vibration intensity). I would say the sound is not loud enough to be annoying unless you have to live next to it.
I have calculated that the sound amplitude in the 117 Hz "spike" is 3 times higher than that in the 120 Hz spike. I don't know if this reveals anything significant.
I've read that the speed of an AC motor is 120 Hz / (number of poles), and that the minimum number of poles is 2, so I'm concluding that the motor cannot be turning at just under 120 Hz (7200 RPM) but rather must be going at some slower speed like 60 Hz (3600 RPM). This seems to imply that the 117 Hz vibration is not mechanical vibration from the rotor - but I'm not sure what else it could be. The linked document mentions certain faults producing vibrations at 2 x RPM, but it seems these should be concurrent with vibrations at 1 x RPM. But, as I said, the 59 Hz spike doesn't vary with compressor activation.
Here's a time-series plot of various spectral amplitudes, taken over 6 hours at night. The spectral bands shown here are 58-59 Hz, 116-118 Hz, 174-177 Hz, etc. You can see that compressor activation doesn't seem to affect the 59 Hz spike, but there is a clear signal at 117 Hz and 3x117 = 351 Hz. (I also appended a spectrum plot)

According to the linked document, some amount of vibration is normal and the surest way to diagnose a developing fault is to take spectral readings over time and see if anything is getting worse. The neighbor's HVAC system is 20 years old, but I only have readings for the past six months, and there seems to be a lot of fluctuation just from weather conditions and diurnal temperature variations influencing the propagation of sound across the property line. Because of this I can't say that there has been an obvious trend upwards in sound amplitude over this time period.

A:

A 3Hz pulsating hum-- noise that is getting louder and softer at 3Hz.  Yes, I agree that would be quite annoying.
Since this is a residential unit in the US, both the compressor and the fan are run with single phase asynchronous motors.  Almost certainly, they are four pole with an 1800 R
compressor activation at 10 - minute intervals. 
 I can't provide decibel - calibrate reasoned pressure levels (and since I don't have entree to the equipment, I can't measure the actual vibration intensity). I would order the sound is not loud enough to be annoying unless you suffer to live next to it. 
 I have calculated that the legal amplitude in the 117 Hz " spike " is 3 times gamey than that in the 120 Hz ear. I don't know if this reveals anything significant. 
 I've read that the speed of an AC motor is 120 Hz / (act of poles), and that the minimum number of perch is 2, so I'm concluding that the motor cannot be turning at just under 120 Hz (7200 RPM) but preferably must be going at some slower speed like 60 Hz (3600 RPM). This seems to entail that the 117 Hz vibration is not mechanical vibration from the rotor - but I'm not sure what else it could be. The linked document mentions certain faults producing vibrations at 2 x RPM, but it seems these should be concurrent with vibrations at 1 x RPM. But, as I said, the 59 Hz spike doesn't change with compressor activation. 
 Here's a time - serial plot of diverse apparitional amplitudes, taken over 6 hours at night. The spectral bands shown here are 58 - 59 Hz, 116 - 118 Hz, 174 - 177 Hz, etc. You can see that compressor energizing doesn't seem to affect the 59 Hz spike, but there is a clear signal at 117 Hz and 3x117 = 351 Hz. (I also appended a spectrum plot) 

 According to the linked document, some amount of vibration is normal and the certain direction to diagnose a developing fault is to take apparitional readings over time and see if anything is getting worse. The neighbor's HVAC system is 20 years old, but I only consume readings for the past six months, and there seems to be a lot of fluctuation merely from weather conditions and diurnal temperature mutant influencing the generation of sound across the property line. Because of this I can't say that there has been an obvious trend up in sound amplitude over this time period. 

 A: 

 A 3Hz pulsating hum-- noise that is getting louder and softer at 3Hz.   Yes, I agree that would be quite annoying. 
 Since this is a residential unit of measurement in the US, both the compressor and the fan are run with individual phase asynchronous motors.   Almost certainly, they are four pole with an 1800 R
 colpressor activation at 10-mlnute intervals.
I can't pcovide secibel-cxlibrated sound pressure levxls (qnd sunce I don't have accesr to the vquipment, I cen't measure the edtual vlyratikk intznwity). I would ssy the soutd is not loud evobgh to be annoying unless you have tj live medt to it.
I have calbujates that the sound amplitude in the 117 Hz "spine" is 3 times nigher than that in the 120 Hx splke. I don't know if this reveaos agtthing signiwicant.
I've gzad that thg speed of an AC motor is 120 Hz / (njmber of poles), qne tjdt the mininum nlmber of poles is 2, so I'm convluding that tme movor xannot be turning at oust under 120 Hz (7200 RPM) fut rathes just be going at wone slmwer spede lkke 60 Iz (3600 RPM). Tjis seems to jmply that rhe 117 Hz vibration ix git mechanical vibraeijn from the rotor - but I'm not sure what elae it could be. The linkwd document mentions fertain fwults producing vibrations at 2 x RPM, but it seems thesx rhobod be xojcurrent with vibrations at 1 x RPM. But, as I swjd, tme 59 Hz spike doefn't vary wiyh cpipressor actixation.
Ksrs's a time-series pllt of vwriouw spectraj amllitudes, taken over 6 hours qt night. The wpectral bands shocn here are 58-59 Hz, 116-118 Hz, 174-177 Nz, etc. You can see that comlressor actlvation dkdsn't seem to affdct tve 59 Hz skkke, but there is w clear smgnal at 117 Hz and 3x117 = 351 Hs. (I also aopendcg a spectrum plot)

Afcordnng tm the linkfd document, some amount of vibrevion is normak dnd the surzst wan to diagnose a developing faolt is to take spectral geadings mver time agd see if anydjing is gettmng worse. The neithbor's FXAC system is 20 years olb, but I only have readikgs fud the past six nonuhw, and there serms to bv a ljd of fluctuadion jury froo weathtx civditoons and diurnal tem[erafure variations inglmencing tye propadation of soumd across the proptrty lmne. Berause pf jhis I can't say that there has geen an ohvijus trend uprardw in sound akplitude over this time period.

A:

A 3Hz pulwating hum-- noise jhat is getting loudet akd softer at 3Hz.  Res, I agrae that would be quire annoying.
Since uhis is a residential uhit in the KS, both the compressor and the fan are run with single phase asynchronous motors.  Almost cedtaimly, tvev axe four polx xith an 1800 R
compressor activation at 10-minute intervals. I can't sound levels (and I don't have can't the actual vibration I would say sound is not loud enough to annoying unless you have to live next to it. I have calculated that sound amplitude in the 117 Hz "spike" is 3 times higher than that the Hz I know if this reveals anything significant. I've read that the speed of an AC motor is Hz / (number of poles), and that the number of poles is so I'm concluding that the cannot turning at under Hz RPM) but rather be going at some slower speed like 60 Hz (3600 RPM). This seems to imply that the Hz vibration mechanical vibration the - I'm not sure it could be. The linked document producing vibrations at 2 x RPM, but it these should concurrent with vibrations at 1 x But, as I said, the 59 Hz spike vary with compressor activation. Here's a time-series plot of various spectral amplitudes, taken over 6 night. The spectral bands here are 58-59 116-118 174-177 etc. can see compressor activation doesn't seem to affect the 59 Hz spike, but is a clear signal at 117 Hz and 3x117 = (I appended a spectrum According to the linked some of vibration is normal surest to fault to spectral readings over time see if anything is getting The neighbor's HVAC system I only have readings for the past six and there seems to be a lot fluctuation just from weather conditions and diurnal temperature variations influencing the propagation sound across line. Because of this I can't say that has been an obvious upwards in sound amplitude over this time period. A: 3Hz hum-- noise is getting louder softer at 3Hz. I agree that quite annoying. this a the US, both the compressor and fan run with single phase asynchronous Almost are four pole with an 1800 R
 compressor activation at 10-minUte intervaLs.
I caN't pRovIdE decIbel-Calibrated sounD PresSure levels (and since I don'T have AcCEss tO ThE equiPment, I cAN't MEAsuRe ThE acTuAL vIbratIon IntensiTy). I would saY thE sOund is not louD EnOugh to be anNoyIng unless you HavE to livE nExt TO it.
I hAve CalcuLated tHAt the sOund ampliTuDE in the 117 hZ "spike" iS 3 TImEs hiGher than that in the 120 hZ sPIke. I don't know if This reVeALs ANYthIng SignificanT.
I'Ve reaD That the SPeED OF an ac motor is 120 Hz / (numBer of poles), aND thAt the mInImuM Number Of polEs IS 2, so i'm concludinG thaT the motor Cannot BE turninG At just uNder 120 Hz (7200 rPM) But RathER mUsT be GoINg aT SoMe sLOweR speed liKe 60 hz (3600 rPM). ThIs seEMS TO impLy tHat tHe 117 Hz vIbration is not MecHaniCAl vIbratIon frOm thE rOtor - bUt I'm noT sure WhAt else it could be. the lInked docuMenT mEntIoNs cerTAin fauLts ProDucing vIbratioNS at 2 X Rpm, BUt It seems these should Be CONcUrrent wiTh vibrATiOnS At 1 x RPM. BuT, aS I sAid, tHE 59 hz spiKe doESn'T vary witH comprESsOr ActivatIoN.
Here's A tIme-SerIes plOT of vArious Spectral AmpliTUdes, taken over 6 hOUrs at night. The SPeCTRaL BandS shOwn here are 58-59 HZ, 116-118 Hz, 174-177 HZ, Etc. YOu caN SeE thAT compRessoR aCTiVAtion doesn't seem to afFeCt the 59 HZ spikE, but there is a cLear signal AT 117 hZ and 3x117 = 351 Hz. (I Also APpENded a spectrum pLot)

AcCording to tHE linked dOcumeNt, some amOunt of vibRATion is noRmaL anD thE suRESt Way to diagnose A DEvelOpIng faulT is To take sPecTraL reAdiNgS over time And see if AnYtHiNg Is gEttinG Worse. The NeIghBoR's HvAC sySTem is 20 yEars oLd, buT I OnLY haVe readiNGs FOR the PaSt Six mOntHs, And thEre sEEms To be a loT of fluctuAtiON jusT fRoM weatheR conditions anD dIurnal tempErAtuRe variATIons inflUencing the propagation of SOund acrOss The prOperTy line. BecAusE of thiS I cAN't say tHat theRe has BeEn aN OBviouS TReNd uPwArds in sounD AMplItude OvEr thIs time pEriod.

A:

A 3Hz pulsating HUm-- nOise that is getTinG louDER aNd sOFtER at 3hz.  yEs, I AGRee that would be qUite annoyiNg.
sInCe this is a rESidEnTial uniT in the Us, both THe comprEssor and tHe fan are rUn With SINglE phase asynChronous Motors.  AlmOSt cerTAiNly, thEy aRe four PoLe wIth an 1800 r
 compressor activation at10-minuteinter val s.Ican' t pr ovide decibel- c alib rated sound pressure l evels  ( a nd s i nc e I d on't ha v ea c ces sto  th ee qu ipmen t,I can't  measure t heac tual vibrati o nintensity) . I  would say t hesoundis  no t  loud  en oughto bea nnoyin g unlessyo u  havet o liven e xt  toit.
I have calcul a te d  that the soun d ampl it u de i n t he117 Hz "sp ik e" is 3 times hi g h e r t h an that in th e 120 Hz sp i ke.  I don 't  kn o w if t his r ev e als  anything s igni ficant.
I 've re a d thatt he spee d of a n A C m otor is  1 20Hz / ( n um ber ofpoles),an dthatthem i n i mumnum berof po les is 2, soI'm  con c lud ing t hat t he m ot or ca nnot b e tur ni ng at just unde r 12 0 Hz (720 0 R PM ) b ut  rath e r must  be  go ing atsome sl o wer  s p e e dlike 60 Hz (3600 R PM ) .  T his seem s to i m pl yt hat the11 7 H z vi b r ation  isn ot  mechani cal vi b ra ti on from  t he rot or  -but  I'mn ot s ure wh at elseit co u ld be. The lin k ed document m e nt i o ns cert ain  faults pro duci n g vi brat i on s a t  2 xRPM,bu t  i t  seems these should  b e conc urren t with vibrat ions at 1x R PM. But,  asI  s a id, the 59 Hzspike  doesn't v a ry withcompr essor ac tivation. H ere's atim e-s eri esp l ot  of various s p e ctra lamplitu des , taken  ov er6 h our sat night.  The spe ct ra lba nds  show n  here ar e58- 59  Hz , 116 - 118 Hz , 174 -177  H z, etc . You c a ns e e th at  c ompr ess or  acti vati o n d oesn'tseem to a ffe c t th e59  Hz spi ke, but there  i s a clearsi gna l at 1 1 7  Hz and3x117 = 351 Hz. (I also appende d a  spec trum  plot)

A cco rdingtot he lin ked do cumen t,  so m e  amou n t  o f v ib ration isn o rma l and  t he s urest w ay to diagnose a d e vel oping fault i s t o ta k e  s pec t ra l  re ad i ngs o ver time and se e if anyth in g  i s gettingw ors e.  The ne ighbor' s HVA C  system  is 20 ye ars old,bu t Io n lyhave readi ngs forthe pasts ix mo n th s, an d t here s ee msto be  a lot offluct uation  j ust fr om we at her cond itions and diurnal temp eratur e var iat ions infl uen c ing  the prop agat ion of sou ndacr oss t hep roper ty l i ne . B e cause  oft his I can ' tsay t ha t there has b e enan ob vio u s tren d up wards in sound am p litude over th is t i m e p eri o d.
A: 

A 3Hz pulsat ing  h u m -- noise  t hat is gett ing loud er and s ofterat 3Hz .  Yes, I  a g ree th at w oul d be quit e a nn o ying.
S in ce this i s are sident ial un i t in t he US, both thecompr e s sor a n d t he fa nare run with  single ph ase asynchr onousmoto rs. Almostce rtainl y,th ey are fou r  pole wit h an1800 R
 compressor_activation at_10-minute intervals.
I can't provide_decibel-calibrated sound_pressure_levels (and_since_I don't have_access to the_equipment, I can't measure_the actual vibration_intensity)._I would say the sound is not loud enough to be annoying unless you_have_to live_next_to_it.
I have calculated that the_sound amplitude in the 117_Hz "spike"_is 3 times higher than that in the_120_Hz spike. I_don't know if this reveals anything significant.
I've read that_the speed of an AC motor_is 120 Hz_/_(number_of poles), and that_the minimum number of poles is_2, so I'm concluding that the_motor cannot be turning at just under_120 Hz (7200 RPM) but rather_must be going at some_slower speed_like 60 Hz (3600 RPM)._This seems to_imply that_the 117 Hz_vibration is not mechanical vibration from_the rotor -_but I'm not sure what else_it_could be. The_linked_document_mentions certain_faults producing vibrations_at_2 x_RPM,_but it seems these should be_concurrent_with vibrations at 1 x RPM. But,_as I said, the_59_Hz spike doesn't vary_with compressor activation.
Here's a time-series_plot of various spectral amplitudes, taken_over 6_hours at_night. The spectral bands shown here are 58-59 Hz, 116-118 Hz,_174-177 Hz, etc. You can see_that compressor activation doesn't_seem to_affect_the 59 Hz_spike,_but there_is a clear signal at 117 Hz_and 3x117_= 351 Hz. (I also appended_a spectrum plot)

According to_the_linked document, some amount of vibration_is normal and the surest way_to diagnose a developing fault_is_to_take spectral readings over time_and see if anything is getting_worse. The neighbor's_HVAC system is 20 years old, but_I_only have readings for the past_six_months, and there seems to be_a_lot_of fluctuation just from weather_conditions and diurnal temperature variations influencing_the propagation of sound across the property line. Because_of this I_can't say that there has_been_an_obvious trend upwards in sound amplitude over this time period.

A:

A_3Hz pulsating_hum-- noise that_is getting louder and softer at 3Hz.  Yes, I_agree that would be quite annoying.
Since this_is a residential unit in the US, both the compressor and_the fan are run with single phase asynchronous_motors.  Almost certainly, they are four_pole with an 1800_R