Maryland State Police 39MHZ but very poor

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Tim Bucknall
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Maryland State Police 39MHZ but very poor

Post by Tim Bucknall » 16 Jan 2015 15:06

39.04 1506ut
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Alex Lawler
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Re: Maryland State Police 39MHZ but very poor

Post by Alex Lawler » 16 Jan 2015 19:58

Great stuff. Was it F2 propagation?
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satnipper
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Re: Maryland State Police 39MHZ but very poor

Post by satnipper » 16 Jan 2015 23:10

Yes - it is F2. North American low vhf F2 has been ok this sun spot high - this Autumn/Winter and last year as well. Lot of East Coast states and even the occasional West Coast opening.

Stuart

Alex Lawler
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Re: Maryland State Police 39MHZ but very poor

Post by Alex Lawler » 17 Jan 2015 05:07

Thanks!
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Tim Bucknall
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Joined: 01 Oct 2014 14:55
Location: Congleton, often in the Peak District
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Re: Maryland State Police 39MHZ but very poor

Post by Tim Bucknall » 17 Jan 2015 15:07

today is dreadful again, apologies to those who can't dx on weekdays
33.42 Orlando made a brief appearance at 14:00

Bushwick Taxis on 29.770 is in if thats consolation Alex, thats almost above 30mhz :-)
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Alex Lawler
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Location: Norwich

Re: Maryland State Police 39MHZ but very poor

Post by Alex Lawler » 17 Jan 2015 18:57

It's close enough, unfortunately I've been working all day so haven't had a chance to dx. Incidentally is it around May that low VHF is more of a SpE phenomenon. In otherwords low VHF mainly propagates via F2 in the winter and SpE in the summer?
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satnipper
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Re: Maryland State Police 39MHZ but very poor

Post by satnipper » 17 Jan 2015 19:39

Yes - more or less. For the TA low vhf you do need to be near a sun spot high. We've had it the last two autumn/winters but not previous to that (IIRC) in this cycle and I doubt if we will see it next autumn/winter. Sp E is shorter range so you wont hear TA low vhf in the summer. The 10m band shows this quite well - at the moment it is relatively easy to work US/Canada/Africa/Asia and further afield via F/F2. In summer 10m Sp E is mainly West and Central Europe. It is also quite common to have 6m Sp E propagation and nothing on 10m which may also contribute to the lack of TA low-vhf DX via Sp E.

regards

Stuart

Alex Lawler
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Re: Maryland State Police 39MHZ but very poor

Post by Alex Lawler » 17 Jan 2015 21:47

Thanks Stuart,so next winter low vhf will continue to be propagated by the F2 layer but as a result of not being near a sunspot max the distances are unlikely to be so great that we will see much TA reception? In otherwords F2 propagation continues but at less of a distance? I'm just checking that I'm understanding correctly. Cheers!
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satnipper
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Re: Maryland State Police 39MHZ but very poor

Post by satnipper » 18 Jan 2015 00:37

I'm saying that F2 propagation will be effectively non-existent as due to the declining sunspots there won't be enough ionisation to "activate" the F2 layer. I may be wrong as we may have one more season to go but the sun spots tend to decline quite rapidly once the peak has been reached which most people consider to be around Spring last year (of-cause this cycle we had a kind of double peak with top and bottom hemispheres of the sun peaking at different times). If we do get F2 next Autumn it will bring in the NA stuff as F2 is long-distance skip.

So if I'm right do your TA low-vhf in next few weeks or wait until 2023/4!!

regards

Stuart

Alex Lawler
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Re: Maryland State Police 39MHZ but very poor

Post by Alex Lawler » 18 Jan 2015 11:36

Thanks that makes sense, I understand now.
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satnipper
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Re: Maryland State Police 39MHZ but very poor

Post by satnipper » 18 Jan 2015 17:39

Excellent!

Of course these low vhf analogue transmissions may no longer exist in 10 years time; replaced by digital. How these digital transmissions will propagate long distance is anybodies' guess.

Cheers and beers
Stuart

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