PSAS/ news/ 2003-12-13 - Suck on foam with the VNA, remeasure the slot antennas, measure the reference dipoles Teflon test?

In attendance: Glenn, Tim, Timr, Dave H, and Andrew & Solomon (just to drop off equipment)

Summary: Someone put a summary here.

Pre-lab:

  1. Timr adds a pass-through to the bell jar base plate (done)
  2. Glenn makes final balun for slot (not done)
  3. Tim makes a flat Teflon-dielectric CPA (not done)

Need to bring/have:

  1. Bell jar, base, CPA's, vacuum pump, power strip, hoses, avionics module - Andrew
  2. All reference dipoles and new slot balun - Glenn
  3. Patch cords, automotive vacuum gauge - Timr
  4. Teflon gluing process? teflon-dielectric flat CPA? - Tim

The test plan:

  1. Suck tests
    1. Test Wifi CPA in bell jar at room pressure.
    2. Suck on Wifi: as many points as possible, at least 0, 35,000ft, vacuum. Then go down to look for hysteresis. How fast does the foam expand and contract? How long until it stabilizes?
    3. Suck on GPS as above.
    4. Suck on ATV as above.
  2. Slot antennas
    1. f0/SWR on WiFi slot
    2. f0/SWR on GPS slot
    3. f0/SWR on ATV slot
  3. Dipoles
    1. f0/SWR on WiFi dipole
    2. f0/SWR on ATV dipole

If there's time left:

  1. Do some crude propogation tests on WiFi and ATV slots using reference dipoles.
  2. f0/SWR on Teflon CPA.

Testing Notes

SCRN00.JPG
SCRN00.JPG: WiFi CPA on bell jar base. Bell not yet placed over it.
SCRN01.JPG
SCRN01.JPG: This is a junk image. Accidently recorded.
SCRN02.JPG
SCRN02.JPG: WiFi CPA in jar at 1 ATM.
SCRN03.JPG
SCRN03.JPG: WiFi CPA in jar at -8 in. Hg
SCRN04.JPG
SCRN04.JPG: WiFi CPA in jar at -14 in. Hg
SCRN05.JPG
SCRN05.JPG: WiFi CPA in jar at -27 in. Hg
SCRN06.JPG
SCRN06.JPG: WiFi CPA in jar at 27.5 in. Hg for about 2 minutes.
SCRN07.JPG
SCRN07.JPG: WiFi CPA in jar back at 1 ATM; Measurement taken immediately.
SCRN08.JPG
_SCRN08.JPG: _ WiFi CPA in jar back at 1 ATM; Measurement taken after 2 minutes.
SCRN09.JPG
SCRN09.JPG: WiFi CPA after jar removed.
SCRN10.JPG
SCRN10.JPG: 2.4 GHz reference dipole.
SCRN11.JPG
_SCRN11.JPG: _ 2.4 GHz reference dipole.
SCRN12.JPG
SCRN12.JPG: 1.5 GHz slot with nothing behind the apature. When the avionics playload is placed behind the apature, the SWR becomes real bad (> 5:1 SWR) at all frequencies.
SCRN13.JPG
SCRN13.JPG: 1.2 GHz CPA on bell jar base. Bell not yet placed over it.
SCRN14.JPG
SCRN14.JPG: 1.2 GHz CPA in jar at 1 ATM.
SCRN15.JPG
SCRN15.JPG: 1.2 GHz CPA in jar at -8?? in. Hg
SCRN16.JPG
SCRN16.JPG: 1.2 GHz CPA in jar at -21 in. Hg
SCRN17.JPG
SCRN17.JPG: 1.2 GHz CPA in jar at -23 in. Hg
SCRN18.JPG
SCRN18.JPG: 1.2 GHz CPA back at 1 ATM and jar removed.
SCRN19.JPG
SCRN19.JPG: I'm not sure what this is.

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