SEATTLE - Vashon Island AM Sites

(Turns out I tried to reinvent the wheel.
More pictures and much more history are at this site I saw after the tour http://vashonradio.com/towertour/
and one of MY pictures is at http://vashonradio.com/towertour/kvi.html)

The pictures below are from the Society of Broadcast Engineers Seattle Chapter 16
  Annual Picnic and Transmitter Crawl - July 26, 2008

All pictures by Kent Randles - water-cooled at sbe124 dot org

Click on the pictures to open the 800x600 pixel version

20080726_051_KOMO_xmtr_building_800X600.jpg (215054 bytes)

KOMO

East side of the late-40s vintage Art Deco KOMO 1000 radio transmitter building.

This side looks towards the three 1/2-wave towers, 492 feet tall.

20080726_050_KOMO_North_side_of_building_800x600.jpg (229625 bytes) The north side of the building.
They have line-of-sight to their TV site on Queen Anne Hill.
The microwave antennas receive programming for a satellite uplink site just to the north.
20080726_048_KOMO2_800X600.jpg (238351 bytes) Jim Dalke of SBE Chapter 16 (in the light blue shirt) gives some background on the site, 
with the new Nautel  transmitter behind him.

Tim Moore of KOMO is to his right

The Continental 317 in the background was on the air.

20080726_025_KOMO_BTA-50F_800X600.jpg (219973 bytes) One each RCA BTA-50F, taking up one whole wall.

It's immaculate, and it works.

20080726_030_RCA_BTA-50F_Finals_800x600.jpg (245686 bytes) And this is just one of the two final cabinets.
20080726_043_KOMO_Power_supply_pass-through_800x600.jpg (306635 bytes) Step right up, and then through,
past the rectifier room and through that back door
to the transformer room.
20080726_042_KOMO_RCA_BTA-50F_Badge_800x600.jpg (293060 bytes) No explanation necessary.
20080726_039_KOMO_BTA-50F_logo_800X600.jpg (234093 bytes) Just gorgeous.
20080726_023_KOMO_BTA-50F_Full_Schematic_800X600.jpg (195436 bytes) My wife Patti points to the...
20080726_021_KOMO_BTA-50F_Schematic_800X600.jpg (271788 bytes) ...particulars of the full-size schematic of the BTA-50F.
20080726_036_KOMO_317_800x600.jpg (247620 bytes) And after the RCA came the Continental.
20080726_038_KOMO_Old_10kw_600x800.jpg (252435 bytes) And the Nautel takes the physical place of this Continental 10 kW former backup,
which is sitting in the shop.
20080726_033_KOMO_Phasor_800X600.jpg (237479 bytes) The matching phasor.
20080726_046_KOMO_Phasor_Door_800x600.jpg (302847 bytes) I guess you don't have to lock the phasor door when you have this cool LED sign.
20080726_055_KOMO_Array_Way-station_800x600.jpg (279116 bytes) I love this way-station between the transmitter building and the south tower.

I imagine you'd like to know how far along you are on the trek to the towers at night in the fog.

20080726_057_KOMO_South_Tower_Base_800x600.jpg (307871 bytes) The base of the south tower.  I like the insulator on the arm for the tower feed support.
20080726_074_KJR-KGNW_Center_tower_and_Buildings_800x600.jpg (233958 bytes)

KGNW & KJR

820 KGNW and 950 KJR share three towers that are 1/4-wave for 820 at 291 feet tall.
This is the center tower, surrounded by the transmitter buildings.

20080726_072_KJR-KGNW_Center_Tower_Filters_800x600.jpg (317239 bytes) The center tower and its filters.
20080726_064_KJR_xmtrs_800x600.jpg (238879 bytes) KJR transmitters.
20080726_065_KJR_Phasor_800x600.jpg (240673 bytes) KJR phasor.
20080726_069_KGNW_Xmtrs_and_Phasor_800x600.jpg (264558 bytes) KGNW transmitters and phasor.
20080726_082_KVI_xmtr_Building_800x600.jpg (365086 bytes)

KVI

If it weren't for the diesel fuel tank in the yard, you'd think this was just another house.

If you look very closely at the railing, you'll see KVI spelled out.

20080726_080_KVI_shop_600x800.jpg (252255 bytes) The building is VERY solid, all concrete.
20080726_088_KVI_xmtrs_800x600.jpg (251537 bytes) The KVI transmitters.
20080726_104_KVI_building_to_Tower_800x600.jpg (284853 bytes) It is QUITE a ways between the transmitter building/house and the tower,
which is at the water's edge.
20080726_089_The_KVI_Beach_600x800.jpg (267159 bytes) Kind of unique for any broadcast station.
20080726_090_On_the_Beach_600x800.jpg (249329 bytes) Can't get much more picturesque than this.
20080726_094_KVI_ATU_and_Feed_600x800.jpg (309917 bytes) Gotta love a 432-foot self-supporter on a beach.  1/4-wave at 570.
20080726_095_KVI_Tower_600x800.jpg (204347 bytes) Old-school, with lattice legs.
20080726_126_KTTH-KPTK_xmtr_Building_800x600.jpg (271474 bytes)

KTTH & KPTK

The 770 KTTH and 1090 KPTK transmitter building.

The stations share three towers, 113 degrees or 1/3-wave at 770,
160 degrees or 0.44-wave at 1090, 400-feet tall.

20080726_119_Tom_McGinley_KPTK_800X600.jpg (219022 bytes) CBS-Seattle Director of Engineering Tom McGinley explains the recent modifications
to the KPTK phasors and the expansion of the day pattern.

He's standing in front of their main transmitter.

20080726_108_KPTK_backup_MW-50_800x600.jpg (282235 bytes) The KPTK backup transmitter.

(On the fourth of five transmitter site tours, cookies were passed out and eaten).

20080726_114_A_KPTK_Phasor_600x800.jpg (230731 bytes) One of the KPTK phasors, in vintage Andrew cabinets.
20080726_118_The_other_KPTK_Phasor_600x800.jpg (240879 bytes) The othe vintage KPTK phasor, looking very Raytheon-like.
20080726_115_KTTH_xmtrs_800x600.jpg (257359 bytes) The KTTH transmitters.  The station is 50 kW day, 5 kW night.
20080726_127_KIRO_xmtr_Building_800x600.jpg (262527 bytes)

KIRO

I love the art deco letters.  The trees hide the massive building.

20080726_133_KIRO_40s_xmtr_800x600.jpg (300146 bytes) A picture of the sprawling, water-cooled, WWII-vintage KIRO transmitter.

Note the north-facing windows, the art deco frame around the transmitter,
the skylight, and the operator's desk (and floor-stand ashtray).

20080726_131_KIRO_racks_800x600.jpg (311550 bytes) Today, some of the frame remains in the center of the room.

The new phasor is to the right.

Note how deep the original transmitter was, and now there's a diffuser on the skylight.

20080726_135_KIRO_Changing_of_the_guard_800x600.jpg (263152 bytes) In another vintage picture, the changing of the security guard which protected the site.

The windows have been replaced by concrete block.

20080726_128_KIRO_racks_other_800x600.jpg (272211 bytes) Gives you an idea of just how big this building is.

Then there's the basement!

20080726_129_KIRO_Main_xmtr_800x600.jpg (227933 bytes) The main transmitter is on the east side of the room...
20080726_144_KIRO_Continentals_800x600.jpg (287530 bytes) ...and the former main and current backup Continental transmitters are on the west side.
20080726_132_The_Desk_800x600.jpg (300389 bytes) That's THE desk.
20080726_140_KIRO_water-cooled_tube_800x600.jpg (279759 bytes) Tom Pierson (center), Director of Engineering for Bonneville Radio-Seattle, dug out one of the original water-cooled tubes.
20080726_154_KIRO_W_Tower_base_800x600.jpg (302856 bytes) The base of the west tower.  Both towers are electrically 134 degrees or about 3/8-wave -.
that's 516 feet.
20080726_157_Lunch_line_800x600.jpg (450950 bytes)

THE PICNIC, FINALLY

Big ol' low-end-of-the-band AM sites have plenty of property for a picnic.

20080726_159_Picnicing_under_a_tower_600x800.jpg (357063 bytes) Nothing like sitting under a tree in the shadow of a couple towers.

Go to SBE124.org