updated 07/18/09
07/18/09 N1FGY, KJ1K and KE3HT took a
trip to greylock with a network analyzer. We repaired the broken cavity
in the transmit chain. The fixed cavity has 20db better rejection of
146.31 on the transmit side than the temporary cavity had. This should
result in a slightly better receive since there will be less desense.
This also resulted in a minor improvement in insertion loss on
146.91mhz which means 6 more watts out! Unfortunately I did NOT
appropriately re-adjust the squelch so we will hear some sparking from
time to time between receptions until I get up there again. Final power
out is now 55watts and no reflected power. We also turned off the the
lodge alarm. Battery backup was tested for 1 minute and the voltage
only dropped to 12.46 volts. The Wall fan needs replacement. It is 10
inches in diameter.
05/31/09 KA1SUN reports the repeater as
having 40watts fwd and 0 reflected. Perfect!
146.91- PL 162.2 is a wide area repeater
maintained by
NoBarc
Location: 3,400ft on top of Mt Greylock Mass
Antenna: 20ft Station master
RF Power: 55watts
Radio: GE Mastr II
Controller: SCOM 7K
Receive pre-amp w/hielacle
100ft monopole tower
Durracom RM5012 + RMBC.
Projects for 2009:
- Replace Fan controller with one that has hum filter
- make a sensor for when AC is out. have controller change courtsey
tone.
- have a RF bypass to run on exciter only using controller.
Some old events:
10/16/08 A work party went up Greylock
and installed 3 new power supplies. The supply for 146.91 is a dual
redundant supply AND it has battery backup! Durracom RM5012 + RMBC.
08/.23/08 WA1ZHM and KE3HT went up and
measured AC power usage. 92watts at IDLE! 357 watts on transmit.