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.k3msb@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
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