A friend of mine in our local radio club sent me the following email
"I'm 6/10's of a mile from an AM 910 KHz. transmitter. They operate with 5k
daytime and 2k at night.
They're S9+45db on 160 meters with clear audio and S9+35db on 80 meters.
have an inverted "V" resonant at 3.715 MHz. orientated east-west, towards
their reflector tower."
The station is willing to pay for a filter for my friends station, and he
has looked at notch and band pass filters but has concerns.
I recommended he look at transmit high pass filters to knock out signals
below 1.8 Mhz and provided him with various links:
https://www.dunestar.com/store/160-Meter-Highpass-Filter-pid-8.html
http://www.kf7p.com/KF7P/Morgan_Filters.html
https://www.dxengineering.com/search/part-type/transmit-high-pass-filters/product-line/dlw-associates-am-broadcast-band-brick-wall-high-pass-filters?autoview=SKU&sortby=Default&sortorder=Default
I have no practical experience with any of these filters and was wondering
what the TB Gang thought.
He would prefer one that handled 1.5 KW but I told him he may have to
settle for 200W.
He prefers an "out of the box" solution.
Thanks
Mark K3MSB
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