Normally - you would only put BCB filters in the receive line - so you
don't need something that handles lots of power. I don't understand why
anyone would be looking at transmit filters for this problem.
There are some basic debugging steps that should be taken to really
understand the nature of the interference. If it goes away TOTALLY when
putting some attenuation in the receiver, then you probably will be able to
solve the problem with a filter. However, it is possibly more likely the
problem has to do with rectification somewhere near the receiver and the
filter will not solve anything. If the signals only are reduced by 20 db
when putting 20 db of attenuation in the receiver - then you are probably
dealing with something that a filter will do no good.
Tree N6TR
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-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
> _________________
> Searchable Archives: http://www.contesting.com/_topband - Topband
> Reflector
>
_________________
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
|