If the S-Meter is close to accurate, the signal on 160 meters is better than -30 dBm. One cannot dismiss that the noise floor of the transmitter on 160 meters is stronger than atmospheric noise and can only be lowered at the transmitter.
Jim - KR9U >On Mon, Jul 29, 2019 at 9:29 AM Mark K3MSB <mark.k3...@gmail.com> wrote: > 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-filt > ers/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 _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector