April, 2002 Site Visit

Photos & notes contributed by Walter Wojciechowski

Ed. Note: While Walt states some dismay at missing pieces, such as waveguide sections, I think it`s quite heartening that there is so much equipment left. With preservation and restoration, this could at least look like an operational system, with only a very few exceptions.

My visit to Camp Hero and the FPS-35 went smoothly thanks to Jim Warren, Tom Dess and his staff, specifically John Rocker who got us started with a brief stop on each floor on the way to the roof where he left us for about 45 minutes. He returned with Richie who stayed with us for the remainder of the visit. Myself and a helper spent about 2 hours assessing the site and I took 80 digital color pictures.


The antenna pedestal structure seemed to be in sound condition despite areas of surface rust. The feedhorn support structure mounts at the pedestal were very rusty, but solid.


I saw only one small horizontal support tube right at the pedestal that is part of the rear main support that had severe rust and missing metal, but it didn`t seem to be a significant part of the overall support structure. The dish reflector and it`s supports were very rusty with evidence of severe corrosion and there were areas of missing metal along the lower edges.

I was not about to climb higher than the top center of the pedestal without safety rigging so I was unable to determine the condition of the top of the dish, or the other two antennas at the top of the main dish.


I discovered a possible reason why the dish no longer free-wheels. Two of the six transmissions do not rotate and their input shafts appear rusted in place. These are the two closest transmissions to the ocean exposure. I was able to turn the input shafts of the other 4 transmissions from stop to stop within the drive gear to bull gear backlash and saw their respective output shafts move. The fact that the dish was free to rotate in the past combined with a quick check of Philadelphia Gear`s website leads me to believe that these are bevel gear transmissions which allow movement when force is applied at either end--input shaft or output shaft. If these were worm gear drives, they would work only in one direction and would not allow the dish to free-wheel. IF the bull gear and rotary joint is not mechanically frozen in place due to rust, freeing up the two rusted input shafts may be all that is needed. Other options include removing the respective output shafts or drive gear driveshafts.


If the bull gear and its bearings are dry or rusted, several options might be tried. Most of the existing Alemite Oil-Mist system is in place as well as the associated plumbing to deliver oil to the gear/bearings.

Manually pumping first a penetrating oil and then a more viscous lubricating oil into the existing supply lines might be sufficient for the minimal movement expected for wind direction changes. Once this is done, a few people muscling the input shafts might be able to turn the dish. If not, careful persuasion from a come-along attached between the antenna structure and one of the rigid eyes on the tower might work.

Regarding painting and preserving the antenna--since the structure looks sound, it might be possible to work on it in place with rigging and/or scaffolds. Perhaps a Bridgepainters Local might be able to help? I was surprised at how little of the transmitting equipment was left. I especially noticed the absence of the rigid waveguide sections. Where did it all go? I can`t think of why it would have been valuable to someone else unless it had gold or silver plating inside.



Power panel--ground floor


"Probability of Detection" Panel see pic # 71 for inside


At bottom of torque tube


Views on roof looking East


Views on roof looking South


Views on roof looking South (zoom)


Views on roof looking West


Views on roof looking Northwest


Views on roof looking North


Antenna Pedestal (A/P) one of six motor mounts and transmissions


Transmission


Transmission input shaft


Back of antenna looking up from center


Back of antenna looking up from right hand side


Feedhorn


Feedhorn ass`y


Waveguide (WG) at center of A/P


Reflector structure from front showing some decay


Right hand side front of reflector


Feedhorn support structure mounting-right hand side


Feedhorn support structure mounting-left hand side


Rusted walkway to feedhorn


Rear support structure


Rear support structure


Rear support structure


Transmission output shaft


One of six bunkers (view from rooftop)


Interior of A/P looking over top of transmission


Interior of A/P looking over top of transmission showing flex WG inside

Note: 2 transmissions on ocean side do not rotate (rusted input shafts?) Rear support structure has less rust than other portions of A/P and appears to be structurally sound. The reflector side, however, is severely rusted and has sections of missing metal. There are several missing sections of support structure for the reflector skin.


Feedhorn ass`y from center top of A/P


Feedhorn ass`y from center top of A/P


Corrosion at feedhorn structure mounting point


Circular WG to antenna on top of main dish


Circular WG to antenna on top of main dish


Top center of A/P showing WG exit


Top center of A/P showing WG exit showing junction box


Antenna reflector and support corrosion


Antenna reflector and support corrosion close up


Omni antenna structure at top rear of main dish


Another radome covered antenna on top of main dish


IFF / SIF antenna on top of main dish


Looking up through center of torque tube just below roof. Ladder inside rusty but solid


Servo/synchro/tachometer ass`y ? on one driveshaft


Driveshaft ass`y


Opening in shroud showing bull gear

Note: Looks like a pressure fed oiling system. Plumbing around circumference with taps at each point where drive gears mesh with bull gear. Also taps for what looks like oil returns.

2nd floor from top


Sperry label


Power distribution panel possibly for drive electronics

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Power resistor cabinet


Bottom of rotary joint


Nameplate on rotary joint (Sperry)


Water cooled WG dummy load


Water cooled WG dummy load


Water cooled WG dummy load


Water cooled WG dummy load


WG gone

Nameplate on Amplifier/Modulator equipment cabinet:
Equip. Group: OA-4678/FPS-35
S/N: 22
P/N: 1035219


Interior of transmitter cabinet


A/C units on top of cabinets


Transmitter cabinet in #1 shielded room


Sperry cabinet 24 mS Pulse Forming Network

P/N: 1018026
S/N: 3


Sperry cabinet 24 mS Pulse Forming Network


Sperry cabinet 24 mS Pulse Forming Network


Driver tube sockets


WG exit on roof of shielded room #2


Business end of transmitter


Tube


Raytheon QK681


S/N 116R4


Tube other side


Side of a cabinet showing cables


See pic # 2 inside of cabinet. Probably a crystal oscillator oven

Next floor down-shielded room


Another tube


Another tube


Tube cooling unit panel

Exterior Shots


Entrance


Clearly shows main dish, Omni antenna at top-rear, and IFF / SIF antenna. Unknown purposes


Close up

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