Hi Jim. I may have misunderstood but I thought the person was looking for
RX filters to block broadcast signals below 1.8 MHz. There are plots on
Jack's website with the specifics but they are not designed for
transmitting....only for receive. You can get them assembled and tested or
as kits too.
73
Greg
On Thu, Mar 31, 2011 at 11:52 AM, Jim Brown <jim@audiosystemsgroup.com>wrote:
> On 3/31/2011 8:34 AM, Greg wrote:
> > Jack at CliftonLaboratories has a HP filter. I have two installed in a
> DXE
> > NCC1 and they work great.
>
> I'd like to hear more about these.
>
> Other options -- Dunestar makes switchable filter sets that are
> generally accepted as being superior to the ICE filters. Google to find
> them. The Cadillac of bandpass filters are the W3NQN designs, currently
> sold (and probably built) by Array Solutions. The W3NQN filters are
> individual filters in boxes, and require a switching system. Array
> Solutions builds and sells such a system.
>
> I have two 402 switchable filter sets and a half dozen single band
> filters. Both of my 402 sets have failed -- they simply will not
> tolerate 100w under contest conditions, and with SWR as low as 1.5 to
> 1. They are OK at the 50W level needed to drive my power amps.
> According to data I've seen, the filter characteristics of the ICE
> filters are a notch below Dunestar, and WAY below W3NQN filters. The 6M
> and 2M ICE filters I bought in about 2003 both were out of alignment
> when I bought them (as measured by insertion loss testing with my HP
> test gear). All were fixed when I returned them for repair, but you're
> without them during that period, and shipping isn't free. And I waited
> more than a year for those 402s when I first bought them, and they came
> in out of alignment.
>
> Bottom line -- while I'm really sorry to hear of Mike's passing, I
> wouldn't cry too long about the loss of the company.
>
> 73, Jim K9YC
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