Receptor HD selectivity demo

[autopaint-1]

http://s58.yousendit.com/d.aspx?id=02ASR8RYSII8N1A79VPTSFUO3Y

Here's a link to some audio recorded from the B.A. receptor HD. The first audio is WOR which was running IBOC at the time. The fidelity wasn't great on this recording but it's good enough to show how well that station is received at my QTH. The next is WLW during critical hours while WOR had their Iboc exciter running. WLW wasn't very strong and while you can hear the WOR IBOC audio WLW even with a weak signal 20 miles north of Manhattan NYC was still audible. After that demo in no particular order I received between 5 and 7 PM local, WPIT (2 ID's) WPTF, WJR, WHO, WGN, WCKY, WBEN, WSB, WBBM, WAVA, & KMOX. Most of these stations are first or second adjacent to a local 50 KW non directional and yet, using the radio shack loop and the receptor interference is barely audible and considering the relatively good quality audio received I'd say this radios selectivity is amongst the best I have ever experienced.

 

[k9ez]

h> ttp://s58.yousendit.com/d.aspx?id=02ASR8RYSII8N1A79VPTSFUO3Y
>
>
> Here's a link to some audio recorded from the B.A. receptor
> HD. The first audio is WOR which was running IBOC at the
> time. The fidelity wasn't great on this recording but it's
> good enough to show how well that station is received at my
> QTH. The next is WLW during critical hours while WOR had
> their Iboc exciter running. WLW wasn't very strong and while
> you can hear the WOR IBOC audio WLW even with a weak signal
> 20 miles north of Manhattan NYC was still audible. After
> that demo in no particular order I received between 5 and 7
> PM local, WPIT (2 ID's) WPTF, WJR, WHO, WGN, WCKY, WBEN,
> WSB, WBBM, WAVA, & KMOX. Most of these stations are first or
> second adjacent to a local 50 KW non directional and yet,
> using the radio shack loop and the receptor interference is
> barely audible and considering the relatively good quality
> audio received I'd say this radios selectivity is amongst
> the best I have ever experienced.
>


Impressive demo. Thanks for putting it up!

 

[rbrucecarter]

> Impressive demo. Thanks for putting it up!

Agreed. Now somebody should track down a schematic to see how they manage it.

One point - a large part of the selectivity is coming from the Radio Shack loop. It has a pretty high Q, enough to help in separating out adjacents.

 

[autopaint-1]

> > Impressive demo. Thanks for putting it up!
>
> Agreed. Now somebody should track down a schematic to see
> how they manage it.
>
> One point - a large part of the selectivity is coming from
> the Radio Shack loop. It has a pretty high Q, enough to
> help in separating out adjacents.
>
True to a degree. The results were similar with the supplied loop, also when you have adjacent signals coming from the same direction, one groundwave and the other via skywave there's no way to null out one without losing the other. The Radio Shack loop shows no noticeable difference when you tilt it, as you would get from say the Kiwa loop.