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Re: Am radio stations


 

Radio Havana broadcasts a monstrously powerful, ridiculously wide bandwidth signal out Cuba on 6.0 MHZ. The 2nd harmonic of that frequency is 12 MHZ, which is the same frequency as the IF stage. I've picked them up at 7.035, which is supposed to be a QRP calling frequency. If there is any other carrier at or near that frequency, it knocks Radio Havana out. I also find that when I orient my antenna East to West, but turn slightly south of west (heading 260), Radio Havana falls into one of my antenna's null zones.?

Although, listening to socialist propaganda on the CRI re-broadcasts is always amusing....



On Mon, Jul 3, 2017 at 12:59 PM, chris gress <Chrisg0wfh@...> wrote:
Hi I am talking broadcast stations in the?
7,100 to 7,200 mhz part of the band I have put in rg174 between dds and vfo input on bitx also used some for my rf gain control r13 to 1k pot?

On 3 Jul 2017 17:35, "Allard PE1NWL" <pe1nwl@...> wrote:
In ITU regions 1 and 3, the section above 7200 is allocated to SW broadcast.
Only in Region 2 (Americas) the section 7200-7300 is allocated to amateur
radio.

So if you're sometimes receiving SW broadcast stations ABOVE 7200, then
that is quite possible due to propagation.

But if you hear broadcast signals BELOW 7200, then these are probably
images from SW stations just ABOVE 7200 (due to mixing with the 4th
harmonic of the VFO).

This is probably not a severe problem when you are in America, but in
Europe and Asia the images can be really annoying, especially in the
evenings.

73 Allard PE1NWL


On Mon, July 3, 2017 18:18, Joe Puma wrote:
> Yes same here in US.? Shortwave radio stations either Asian or Spanish
> language speaking a.m. stations show up here at night due to propagation.
>
>
> Best,
>
> Joe
> KD2NFC
>
> Sent from my iPhone
>
>> On Jul 3, 2017, at 6:33 AM, chris gress <Chrisg0wfh@...> wrote:
>>
>> I am getting am broadcast stations on my bitx 40 at night time I am not
>> seeing these stations in the day any help in stopping this from happing
>> is anyone else? in euro land seeing this? I posted this last night but
>> it never got on the group thanks for any tips
>>
>







--

Andrew Krause
General Class Amateur Radio License: KM4ZJO
andrew.krause@...
(404) 732-2369



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