15092-30093-15775(P17431)
-2I120917-3647--197382



HF TRANSMITTER SET  Operating Manual

HL1INF's KWM-2A set

Collins 30L-1 Linear Amplifier

Collins 312B-5

Collins KWM-2A

FT890AT
Solid State
HF Transceiver
YF-110C(CW Filter 500Hz)

Home Made 3-500Z (Two 3-500Z)
Two 3-500 Linear Amplifier
 

MN2000
Matching Network (Tuner)

 

   

R7
Antenna   

BTL-A

Paddle


144 / 430 / 1200

 

 


Link

MUSEUM Link

Link

 Collins Amateur Radio Equipment

 Collins Radio Virtual Museum

Collins Radio Equipment Manuals

 Collins Emblems

 R.L. DRAKE VIRTUAL MUSEUM

 R.L. DRAKE VIRTUAL MUSEUM

  Collins Mechanical Filter

 Collins Radio Virtual Museum
  

     


811A Cathode(Filament) 

811A


KWM-2A Meter


Bird 4522-002     1KW & 5KW
Bird 43 elements

 


WH7 Meter


BIRD 43 METER


METER

 


Outside Thermometer

 

 

 

 

VC-6045
Instruments


Tools

Parts

 

 

 


  
http://cq.mykit.com

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Effect of altitude on a transformer
The capacity of the transformer should be derated by 0.3% for each 300 feet.
Derated by 10%(8%) for 10,000feet

 

 

Effect of high altitude

Q: What the effect of high altitude to transformer?

A: The higher the altitude, the lesser air density. Transformer uses air as heat dissipation medium, hence in high altitude, transformer's heat dissipation will be restricted. The following table explains maximum allowable ambient temperature respective to altitude and how to derate transformer loading if ambient temperature is higher than recommended. The guidelines are found in ANSI C57.92/81 as outlined below.

Example: Air-cooled transformer rated 1000 kVA placed at altitude of 3000 m. Derating factor is 8%, recommended maximum transformer load is 920 kVA.