VK5RBV to come back at Full steam

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VK5PJ
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VK5RBV to come back at Full steam

Post by VK5PJ » Thu Nov 15, 2018 9:17 am

Hello,
I am happy to report that today I have received and paid the invoice from the ACMA for the updates to the VK5RBV beacon allocations on 50 MHz and approval for the addition of 144, 432 and 1296.

At present the 144.456 MHz beacon is on at a 10 watt power level to a single 'PAR omni angle' antenna (Horizontal Omni) at the 12 Metre level on the club tower modulation is CW and JT65B on alternate minutes, reports are welcomed.

50.456 is running as only the exciter (100 mW) into a single HALO at the 6 Metre level on the tower, Modulation is CW and JT65A on alternate minutes. I hope to have it up to the expected 10 Watt level in the coming weeks.

432.456 as yet does not have an antenna installed at the site but I have some omni horizontal antennas at home that can be pressed into service.

1296.456 is ready to go but the antenna is still a mystery as to what to use.. it might end up with a number of small yagis in Key directions (will need to source a splitter).

All of these beacons are part of a ZL2BKC beacon controller and can run a number of modulation schemes
Peter Sumner, vk5pj
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Re: VK5RBV to come back at Full steam

Post by VK7HH » Thu Nov 15, 2018 10:12 am

Excellent work Peter!

I will definitely make use of the beacons this summer. Thanks for the hard work.

Regards
Hayden

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Re: VK5RBV to come back at Full steam

Post by VK2AAE » Thu Nov 15, 2018 2:10 pm

5RBV was the first VK 6m beacon I heard. Very pleased it's back and THANK YOU very much
pat r

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Re: VK5RBV to come back at Full steam

Post by VK4CZ » Fri Nov 16, 2018 8:34 am

Thanks Peter - great news. Will keep an ear out when next near shack. :thumbup:
Scott VK4CZ
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Re: VK5RBV to come back at Full steam

Post by VK5PJ » Wed Dec 26, 2018 9:49 am

Hello, as of today at 23:00Z all of the VK5RBV beacons are off, I am working on integrating the 50 MHz PA and hope to have it back on air in the next few days.
Peter Sumner, vk5pj
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Re: VK5RBV to come back at Full steam

Post by VK5PJ » Fri Feb 08, 2019 8:06 am

Feb 2019 update.

50 MHz beacon is on-air doing heat soak tests from my home QTH (5 KM from beacon site). getting the 50 MHz section going has taken a lot of my time and energy but hope to have it at the propper site over the weekend of 9 - 10 of Feb. This will see 50.456 and 144.456 on air with 15 watts 24/7

Code: Select all

Modulation:
 50.456 MHz, 1 min of CW ID and 1 min of JT65-a
144.456 MHz, 1 min of CW ID and 1 min of JT65-b
Peter Sumner, vk5pj
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Re: VK5RBV to come back at Full steam

Post by VK7HH » Fri Feb 08, 2019 9:45 am

Thanks Peter.
Is the 2m beacon on air yet, or still under test?
I've been listening but haven't heard it during openings.

Hayden

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Re: VK5RBV to come back at Full steam

Post by VK5PJ » Sun Feb 10, 2019 7:11 pm

Feb 10th update

50.456 MHz (15W) and 144.456 MHz (12W) were turned on at the Mt Kitchener site today. The 144 beacon was on previously in 2018 but had been off since Nov 2018 to allow me to add the P.A for 50.456.

Peter.

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Re: VK5RBV to come back at Full steam

Post by VK5PJ » Sun Feb 17, 2019 3:27 pm

Hmmph, looks like the P.A on 50.456 has failed, signal is back to exciter levels here at home... 144.456 is going all okay so unsure what has happened.
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Re: VK5RBV to come back at Full steam

Post by VK5PJ » Sun Oct 27, 2019 7:21 am

Well, it has been a while,
found the Mitsubishi module on 50.456 was dead, not a board fault Hmmph.
Went looking of a replacement module, nope, no longer available. A new version is advertised out in Google land but only people with stock seem to be China and I am not willing to take that gamble. (Minikits list it as coming).

I put a please help on VKClassified web site to secure at least one Philips FM-828 E-Band radio so I could convert the P.A for use on the 50.456 beacon and ended up with three, thanks to the kindness of a ham in VK3 and a local here in VK5.

Using the information listed here:http://www.unixservice.com.au/hamradio/ ... m828e.html the P.A was first tested before conversion, then moved to 50 MHz. The exciter and receiver boards were stripped out and the relay in the P.A removed. complete wiring loom removed and just the needed point to point wiring was put in

At this point, from around +8dBm input (what the ZLPLL gives me) I can easily create 15W on 50MHz, now just need to visit the beacon site and connect it all up. (27-Oct-2019)
Peter Sumner, vk5pj
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Re: VK5RBV to come back at Full steam

Post by VK6XLR » Sun Oct 27, 2019 11:20 am

Hi Pete,

Nice work!

For info, the Simoco SRM9000 E0 uses the Mitsubishi RA30H0608M module. However they want a damn fortune for them. Last quote was $90 + GST and $20 postage :(
So if you can find a E0 somewhere :)
Rick Kowalewski
-- Perth, WA, 6530 -- OF77xw --
VK6RK

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Re: VK5RBV to come back at Full steam

Post by VK5PJ » Sun Oct 27, 2019 4:22 pm

Thanks for the tip SKI, have not run across many PRM80's from low band.

VK5RBV, 50.456 MHz, 1 min CW 1 min JT65A, about 12 W into the original HALO antenna, 27th Oct 2019. Sounds OK at home and 5BC said it was strong at his place..

VK5RBV, 144.456 MHz, 1 min CW 1 min JT65B, about 15 W into single a PAR OmniAnge, antenna (Horizontal polarization), checked power and fixed GPS antenna as the time sync was bad.


Any reports welcomed to: vk8zlx at gmail.com
Peter Sumner, vk5pj
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Re: VK5RBV to come back at Full steam

Post by VK2AZ » Mon Oct 28, 2019 7:44 pm

Good work Peter,
I have updated VKSpotter.com

And added the 2m Beacon.
Let me know if any of the details need to be changed.
Hilary - VK2AZ
Glenmore Park NSW
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Re: VK5RBV to come back at Full steam

Post by OZ2M » Sat Nov 02, 2019 4:57 am

Hi

I can't say why the RA30H0608M died. But I can think of two reasons, yet there may be many more.

Second Harmonic
One reason could be the level of the second harmonic that is only about -5 dBc. If the power module is followed by a low pass filter, which is highly recommended, the power returned to the module may kill it over time. For normal QSO use the duration of the returned power may not be critical, but, perhaps it is for beacon use. EI0SIX has been using a RA30H0608M on 6 m for some years now but only at 20% duty cycle.

But here is more about the second harmonic issue using the RA30H0608M on 6 m: https://groups.io/g/RFzero/topic/output ... n/38958219

The level of the second harmonic, out of the RA30H0608M, is why we decide not to use it for the OZ7IGY 6 m beacon. But on 4 m it has been running flawlessly for almost seven years now. So has the power modules on 2 m and 70 cm. More about OZ7IGY here: http://www.oz7igy.dk/

Bimetallic effect
A second reason may be the bimetallic effect on non RoHS compliant modules. This effect was seen some 15 years ago. See the very end of this page: http://rudius.net/oz2m/70mhz/pmpa_kitdocs.htm

You may check the bias track in any case.

Bo, OZ2M

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