WSPR on 432MHz

[VK3BQ]

And another. We are plying with call signs to see what works.

[VK2KRR]

Well we learnt, putting a 7 at the end or the start makes the program send some crazy information.
If you have a 6 digit call and put in /7 then the message becomes to long for the program to send all at once and so breaks it up sends call and then send grid at a later time, this is not optimal.
Could be just best to send normal calls unless u have a 5 digit call or are RX only.
Through the rain storms and static, didn't do any good hearing Phil VK5AKK on 70.
Was able to get through to the Melbourne stations, but a lot more AE doppler signals were showing up and without GPS reference locking, it was a pretty poor excercise, although we did get a few decodes.
Thanks for the screen shots Andrew.

[VK5ZD]

Hi

I've been looking at the WSPR source code and, near as I can tell, callsigns must comply with one of the following formats listed in the attached document. Adding prefixes/suffixes causes the message to be split as described in the documentation.

If you use the CWID for 'official' identification then you could make some radical changes to the callsign field. For example:
(1) Replace the 'VK' with a '7' (e.g. 75ZD, 72KRR).
(2) Drop the 'VK' and add 'space U' (for UHF) after the callsign (e.g. 5ZD U, 2KRR U).

73
Iain

WSPR_Callsigns.PDF

(2.86 KiB) Downloaded 233 times

[VK2KRR]

Image of Jeff VK5GF's WSPR transmissions today. I think there may be more GPS customers soon.
You can see in the screen shot, AE signal, Tropo signals and a meteor ping skimming across.

VK5GF 70cm WSPR

[VK5ZD]

I'll leave WSPR running on 70cm for a while.
Dial frequency 432.300MHz, audio 1540Hz, TX 20% (GPS locked).
Beam pointing towards 'The Rock'

[VK2KRR]

Hi Iain,

I'll have a look once the wind calms down a bit.
Its hard to hear you on 2m under average conditions, let alone 70cm.
More antennas required

[VK2KRR]

Hi Iain,

Able to check for you this morning. I've seen a good TX from you at around 2030utc but my rig was about 200 Hz high, got you in the bandpass here and next one not so good. Just waiting to see if I can get enough from a following TX, or else u may need to give me another 3dB up from 10W level

[VK2KRR]

Just FYI, Derek VK6DZ is now also running 70cm WSPR, GPS locked, same time as 2m WSPR.

Am unsure about Dereks 70cm antenna specs though?

Derek VK6DZ 70cm WSPR

[VK1JA]

I'm keen to do some testing on 70cm wspr now that I've got a yagi up in the air. I'll keep an eye on the wspr map, but if anyone would like to do some tests, just send me a PM via this forum.

Jayson

[VK5KK]

Hi All

Slightly off topic (WSPR on 23cm) but came about when it was discovered that this "un-modified" transceiver was stable enough for 432.300 MHz WSPR!!

Here is a plot of VK5AKM sending on 1296.5015 (using OXCO locked IC-910H) .. first receive period too much drift to decode and clearly dial setting high in frequency but then the transceiver had only been turned on 1296 Mhz for a few minutes. After a 2 minute tx period and retuning the transceiver successfully decoded 6 consecutive WSPR transmissions. Upward drift slowed about 10 minutes after switch on then slowly moved back down. The transceiver does have a reasonable TCXO as its reference (not a PC xtal oscillator!) and the shack temperature was stable.

So what is the "un-modified" transceiver?

A Kenwood TS790A I bought new in 1991!

Was quite surprised when recently giving it a service just how stable the reference was. Might be a good one, certainly out performs the unmodified (now modified) IC-910H that replaced it. I suspect that heating from a PA on 50% duty cycle would send it drifting and it would be all over the place in a summer field day but not bad for something designed nearly a quarter of a century ago

Cheers

David VK5KK

[VK5ZD]

Been hearing a carrier on 70cm WSPR for some time now (maybe 2 hours).

The lighter trace at 23:56 is when I swung the beam round to determine where it's coming from (result: from the east).

[VK2KRR]

Thanks for the 70cm signals this morning Iain and Keith (also good to chat on VK5RAD 2m), hung in there a surprisingly long time on 70cm WSPR, Keiths sig appears last at 0146 utc by the looks of it
Hope to be able to TX back when I sort the freq reference out.

Iain, I saw no carrier while I was watching the screen. Could be interference, birdie etc? I see Keiths sig still showing side sigs there also.

Great fun on 70cm, I must get the 23cm pre-amp sorted out again after the water damage and we can climb higher in freq.

It would appear, looking at Hepburn charts, that it could be good in the south east areas again tonight and/or tomorrow morning.

[VK1JA]

A successful 70cm decode of VK3NFI tonight - my first decode on 70cm. I got another double decode which is weird, but it worked !

[VK2KRR]

Well done. Probably both AE doppler reflecions. Dean is locked, and so is yourself I think, so should show up as 0 drift otherwise.

[VK2KRR]

I'll be monitoring 432.300 WSPR while I have no 2m horizontal yagis up.

Majority of the time it will be beaming toward Melbourne as the tower also carries the marine tracking yagis.

Will beam other directions (west/SW) when its looking good or if requested.

[VK1JA]

Very good conditions last night and today, the Hepburn charts looked promising so I decided to fire up 70cm WSPR and point it west.

The result was a two way spot over night with VK5PJ at 923km, both running 10w

I've also spotted VK5PJ this morning (note shown in the pic), so conditions are still going.

These spots couldn't happen without good conditions and GPS locking - note the ZERO drift in signals.

I wonder what the record is for 70cm WSPR on 10w?

[VK1JA]

And they're currently coming in from VK5AKK @ 947km @ -26 !!

2015-06-25 23:56 VK5AKK 432.301458 -26 0 PF94ix 10 VK1JA QF44no 947 96
2015-06-25 23:40 VK5AKK 432.301458 -28 0 PF94ix 10 VK1JA QF44no 947 96

[VK2KRR]

World record 70cm WSPR paths as far as Im aware Jayson.
See if you can crack the 1000 km barrier now

[VK5PJ]

hmmm 80 km west of hear is very salty.

See if you can crack the 1000 km barrier now

[VK5BC]

Corny Point would do the job, might have to set 70cm up there later in year, good work Peter & Jason.

73's Brian
VK5BC