FreeDV 40m Sunday Australian net - 18 stations

[Peter Marks]

Another active FreeDV RADEV1 net in South Eastern Australia this morning on 7.177Mhz. Some stations were not in a position to transmit but I've counted them all. VK2DUX, VK3BRT, VK3CKY, VK3KQT, VK3SRC, VK4WGR, VK5KVA, VK5LN, VK6KR, VK6POP, VK3KEZ, VK2TLQ, VK5JSA, VK3JF, VK3YV (Portable!), ZL2TJM.

The FreeDV reporter behaved perfectly this morning.

73

Peter

VK3TPM

[Bob Bristow]

Hi Peter & all

Both Kevin and I weren't hearing anyone.  I had a brief two second decode of someone's voice (one of the VK3s I think).  Conditions were not good, not helped by my not-very-good-antenna.

My plan is to get a better antenna up during this week.   At present I'm using a fairly random length of speaker wire of something a bit over 20ms length as an end fed.

Once I work out how to place the G5RV on my small property I should be OK.  

cheers

Bob VK6POP

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[Peter Marks]

I saw you there but conditions were not good. 

Speaker wire works well for me ;-)

Peter VK3TPM

[Al Beard]

To Bob VK6POP,

Noting you use speaker wire, the twin wire, figure 8 type, why don't

you use it as a transmission line out to the centre, the 10m point 

making your antenna a centre fed dipole.

How?

Use a transformer with very low capacitance ie. high impedance

between primary to secondary,  to end feed the antenna.

Radio === transformer =============---x===============x

 (both wires soldered at x)

Transformer: just four turns each side on a 3H1 cross core ferrite.

3pF primary to secondary

(toroid's from PC power supplies are no good)

At 40m, speaker wire as a transmission line is quite OK. 

alan VK2ZIW

On Thu, 2 Oct 2025 13:30:11 -0700 (PDT), Peter Marks wrote

> I saw you there but conditions were not good.
> Speaker wire works well for me ;-)
>
> Peter VK3TPM
>

> >> <https://groups.google.com/d/msgid/digitalvoice/2db35522-9ca3-4954-89d5-3bedecad31fcn%40googlegroups.com?utm_medium=email&utm_source=footer>
> >> .

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---------------------------------------------------
Alan VK2ZIW
Before the Big Bang, God, Sela.
OpenWebMail 2.53, nothing in the cloud.

[Bob Bristow]

hi Alan et al

interesting idea, thanks.

I have a couple of doublets here - I'm trying to work out how to set them up at my new place @ 400 sq metres.

I'll work something out eventually.  Meanwhile I'm working with an end fed half wave for 40m (speaker wire).  It works really well since I fixed the faulty PL259 on the Ugly Balun.   Yesterday I gave all the components of the feedline the works with a dummy load and antenna analyser looking for faults.

Tonight I fixed an issue caused by a faulty DC lead to the rig, so all is well (until the next thing breaks!!).

I had a QSO tonight using FreeDV on 40 metres with Paul VK2EX in Dubbo, 3445 Km from here, and with Rob VK3CKY in Victoria, a similar distance from here.  So the speaker wire is doing its job.

cheers

Bob

VK6POP

To view this discussion visit https://groups.google.com/d/msgid/digitalvoice/20251003102953.M42843%40unixservice.com.au.

To view this discussion visit https://groups.google.com/d/msgid/digitalvoice/20251003102953.M42843%40unixservice.com.au.