Dave G4AON wrote:
Adam
a friend has a
well maintained Racal RA1792 military receiver which is hopeless
compared to even moderately good amateur gear such as his Kenwood
TS-850, I appreciate the 1792 wasn't one of the better Racal receivers
but they weren't cheap.
If things in the Mother Co
Adam (VA7OJ/AB4OJ) wrote:
"It is highly significant that professional receivers manufactured by the
likes of R&S, Rockwell-Collins, Racal and Harris have a single roofing
filter. This filter is typically 12 to 16 kHz wide, to pass multi-channel
ISB, VFT (multiplexed teletype) and high-speed cryp
The IMD contributed by inductor cores used in the front-end selective
circuits is often not taken into account either, or for that matter any core
within the signal path. They can bite.
73,
Geoff
GM4ESD
Larry Phipps wrote:
This is a subject which seems to be gaining in importance as receiver
Hat tip to Larry ... now all I need is a commission on every QEX sold ...
Crystals are non-linear and their motional parameters are, to some
degree or other, a function of drive voltage. Since a filter's loss is a
function of its motional parameters, the corollary to that is
intermodulation c
This I have noticed during my own IP3 measurements on my
FT-1000D, not as much as 16dB but around 3 dB.
This was with the INRAD roofing filter and 2 kHz offset.
in any case this was enough for me not to use the filter.
I´m eagerly waiting for measurement figures on the K3.
Beats me why they can´t
Well done, Bill. This again shows the importance of real life
measurements... and why I didn't order any filters until more is known
about them.
Anybody interested in the subject of filter design must read the article
by list member Jack, K8ZOA in the current QEX. It gives a lot of
valuable x
6 matches
Mail list logo
