10 Metres open to USA

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daveB
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10 Metres open to USA

Post by daveB » 14 Feb 2015 15:32

I don't know if this counts as 'low VHF' - but I'm enjoying a nice bit of nostalgia receiving Radioteletype (RTTY). Lots of signals on 14 and 21 MHz - but the 10 metre band is open to the US/Canada. And the low end 28.05 - 28.15 approx is full of RTTY - muat be a worldwide RTTY contest. I quickly downloaded the MMTTY program and was taken back 30 years to when I was active on 'steam' RTTY using an - wait for it - Acorn Atom computer with a Maplin TU10 interface. I worked a good few stations in that mode. Later upgrade to a Dragon32 (Tandy clone)

The traditional 5-bit baudot code at 45.45 baud is still going strong - but I bet all the signals are computer generated.

It's the usual set up of SDRPlay+HDSDR and 70MHZ horizontal dipole - feeding the MMTTY program.

ADD: Just logged ZV2K calling - located in Sao Paulo, Brazil according to a google search - weak but fully decoded. Distance of over 5900 miles.

Rgds

David
SDRPlay, AirSpyMini, RTL dongles, SB920s, Yamaha TX930. 5 ele compact yagi on rotator at 18ft agl. FM5 facing east, FM5 facing south, FM3 facing NE, OIRT dipole, 3-ele Moxon vertical facing east.

satnipper
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Re: 10 Metres open to USA

Post by satnipper » 14 Feb 2015 17:08

10m has been open to North America most days since early Autumn. Brazil is also an easy shot on 10m - see if you can get Chile or Paraguay as dusk approaches. This weekend is the CQ WPX RTTY contest - hence the activity. Probably the 2nd biggest RTTY contest after CQ WW RTTY which is last weekend of September IIRC.

HF for me the last 2 weeks has been dominated by K1N Navassa Island - it has not been pretty or enlightening. A true exposure to the darker side of man though, that's for sure.

Stuart

ps

10m is not low-vhf - 10m is top end of HF. Low VHF starts at 29.7 I would assert.

daveB
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Re: 10 Metres open to USA

Post by daveB » 14 Feb 2015 19:57

"10m is not low-vhf - 10m is top end of HF. Low VHF starts at 29.7 I would assert"

I always remember "3-30 HF", "30-300 VHF", "300 and above - UHF and beyond". Those were the days when 70cms was esoteric! I only queried it as I've seen logs being posted in the 25-30 MHZ range in the 'low VHF' category. Maybe we'll get a weird "if my RTL dongle can receive it it must be VHF" category :)

As for K1N - that probably explains the huge pile up on 14MHz spreading over +/- 10kHz

Rgds

David
SDRPlay, AirSpyMini, RTL dongles, SB920s, Yamaha TX930. 5 ele compact yagi on rotator at 18ft agl. FM5 facing east, FM5 facing south, FM3 facing NE, OIRT dipole, 3-ele Moxon vertical facing east.

satnipper
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Re: 10 Metres open to USA

Post by satnipper » 14 Feb 2015 23:39

I picked 29.7 as that is where amateur 10m ends and utilities start. But I wouldn't quibble with your band designations.

K1N has had massive splits - 10 kHz would actually be the smallest I have seen. 30 kHz on cw and over 50 kHz on ssb have been the norm. Whilst some of the cw ops have been competent it's been yet another American led dxpedition with massive unnecessary disruptive splits. A consequence of guys with more money than skill going on the dxpedition - it's probably cost them upwards of $25k each personally with upteen helicopter flights etc. That buys a lot of wine. women and song in Benidorm!

Stuart

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John Faulkner, Skegness
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Re: 10 Metres open to USA

Post by John Faulkner, Skegness » 15 Feb 2015 00:28

You buy women in Benidorm, Stuart?

satnipper
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Re: 10 Metres open to USA

Post by satnipper » 15 Feb 2015 11:24

Behind the wine and song to be honest. And the fish that nibble your feet.

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John Faulkner, Skegness
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Re: 10 Metres open to USA

Post by John Faulkner, Skegness » 15 Feb 2015 11:53

:)

Tim Bucknall
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Re: 10 Metres open to USA

Post by Tim Bucknall » 23 Feb 2015 15:23

daveB wrote:"
I've seen logs being posted in the 25-30 MHZ range in the 'low VHF' category.
I plead guilty!
I'm not sorry and i'll do it again! ;-)

the NFM services in the 25-30mhz range like Taxis/Pagers/Church Broadcasts/Chinese Trawlers/Buoys/Talkback & cueing feeds etc fit better with Low VHF logs than with AM/SSB HF logs

The Russian Taxis sprawl over 25.165-30.105 it would be annoying to arbitrarily chop my logs into 2
The Buoy allocation also straddles the divide between HF & VHF 29.705- 30.500mhz
Chinese trawlers also cover 29.7-31.5mhz

29.700 is a nice cut off in theory (better than 30.000) but in practise its not that clear
26.100 is another lower limit thats used a lot

I can certainly see why Radioshack type scanners start the low vhf at 25.000mhz, I've had Russian NFM voice as Low as 25.0mhz
(until they vanished recently Chinese Trawlers used NFM in 12.5 khz steps down to 24.8875mhz)
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