surely it is important to have the correct loading on the crystal, just
connecting a crystal in the antenna path is not so good?It seems good loading
is around 1-3k.
Merry Christmas to all.Raoul ZS1C
From: K1FZ-Bruce
To: topband@contesting.com; Dave
The one they are developing for marketing 'can' have 1 KHZ segment
crystals channels..
I would encourage anyone to insert a single crystal in their receiver
antenna input to see the
difference before considering a purchase. (Careful not to transmit
into the experiement)
40 meters is a
DON’T OPEN THE LINK IT NOT FROM ME. IT MAY BE A VIRUS!
From: 'topband' [mailto:topband@contesting.com]
Sent: Friday, December 23, 2016 8:33 PM
To: n...@comcast.net
Subject:
"Re: Topband: Radio World; Noise Floor; Where do we go from here?"
JC doc
About 15 years ago I built a switchable front end crystal filter, I was
going to market it but it was too expensive for the Ham market. It covers
1800 to 1850 in 5kHz segments with a slight overlap so that there are no
gaps, each section is a half lattice, the insertion loss is about 6dB but
that
Crystal filters are nonlinear passive devices by nature of the characteristics
of the crystal(s). The motional characteristic of a quartz crystal is a
function of the level of the signal applied to it, known as drive level
dependence or (DLD) in engineering terms. Crystal filters can
Crystal filters are nonlinear passive devices by natureof the characteristics
of the crystal(s). The motional characteristic ofa quartz crystal is a
function of the level of the signal applied to it, knownas drive level
dependence or (DLD) in engineering terms. Crystal filters can
I've spent some time using the MFJ-1026 noise canceler. It took some effort
to get it to work, I had to come up with a much better noise antenna. I
bought one of those 8' crappie poles from local big chain and spiral
wrapped about 50' of wire on it. I mounted it in the clear as close to my
Response from Warren below. He was very strong so it was not a harmonic. He was
there on purpose. Not sure if we have experimental frequencies below 160 meters
?
- Original Message -
Joe,
Thanks for the report!
Running abt 75W into an inverted L
73 Warren
On 12/22/2016 4:55 AM,
Hi all. Very interesting "thinking out loud" topic.
With regards to the 403 crystal front end unit system (it seems not yet
available), it will obviously be quiet expensive, even much more than
the Yaesu uTune system.
With 15 or 30, 1 Khz bandwidth segments or 15 or 30, 3Khz bandwidth