The centertap for varicap reference is seen connected to coax cable ground, so
it does work
but I am not certain if it is a point to use actual ground for the frame, it is grounded in
the shack via the RG59 cable, and this is put some times through a high-µ ferrit core, so
AC-wise it is not much ground, but DC-wise is OK (not sure if anything in the
shack is ground)
73
Jan-Martin
-----Opprinnelig melding-----
Fra: Johan Bodin [mailto:[email protected]]
Sendt: 12. november 2002 16:30
Til: [email protected]
Emne: LF: Re: RX Frame Aerial for 136kc/s - still experimenting.....
LA8AK wrote:
Not sure if it is still a point to ground the center of the tuned loop.
There is no hi-z amplifier on the tuned loop that can suffer from common
mode hum but you still need a low impedance DC path to GND for the
varicap bias, otherwise the ever-present 50Hz hum would wobble the
tuning with disastrous results.
73
Johan SM6LKM
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