1450 KHz has many more "local" stations on it in the USA than does 970.
1450 has better "sky wave propagation" being that it is higher in frequency.
So what you are hearing as wobble is either multiple stations on 1450 KHz or
more likely the effects of multi path propagation (ground wave and sky wave
which = QSB).
970 is a much better "ground wave" frequency than 1450.
>From a ground wave perspective:
5 KW at 570 KHz goes as far as 50 KW at 1500 KHz!
1500 has much better skywave propagation at night
73!
Tim K3LR
-----Original Message-----
From: rfi-bounces@contesting.com [mailto:rfi-bounces@contesting.com] On
Behalf Of kd4e
Sent: Wednesday, November 21, 2007 2:38 PM
To: RFI List
Subject: Re: [RFI] OT? Why Does 1450 Wobble & 970 Not?
I used the wrong term, am distracted here and brain
isn't pulling up the correct term!
It is that usual late afternoon/early evening sound
common to AM signals - kinda distorted and drifting -
it's not a frequency change but rather a propagation
thing.
Just wondering why it is more profound on 1450 vs
970.
> Nathaniel Lee wrote:
> Wobbles? As in a change of frequency perhaps?
>
>> I am not sure where to post this so I thought
>> I'd ask here and get a referral to a more
>> appropriate list ...
>>
>> Why is it that late in the afternoon a BC radio
>> station on 1450KHz wobbles and 970KHz does not?
>>
>> Signal strength appears to be roughly equal.
--
Thanks! & 73, doc, KD4E
Personal: http://bibleseven.com/kd4e.html
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