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On 01/15/2018 09:16 PM, n2vdy via Groups.Io wrote:
On the rv3yf page there is a link to a manual for the Klopik radio. The
schematic for the filter is the same. There are YouTube videos showing
the radios in use.
On Mon, Jan 15, 2018 at 05:51 pm, Arv Evans wrote:
It would be interesting to see a schematic of that crystal filter
that uses diodes to vary the bandwidth.
I recognize some, but not all, of their products as being the work
of Wim SP5DJJ.
Their web site is very slow so you need some patience to wait for
things to become visible.
On Mon, Jan 15, 2018 at 5:58 PM, n2vdy via Groups.Io
<firstname.lastname@example.org <mailto:email@example.com>> wrote:
I have a Russian radio kit I haven't put together yet called the
Druzhba-M. It has a crystal filter with varactor diodes that it
uses to vary the bandwidth of the filter.