Gotta be RFI, what’s your feedline and antenna? Do you have access to an antenna analyzer?

73, Willie N1JBJ

Any idea why I get a key down sound with the dummy load but not when connected to an antenna? I then just get a buzzing sound.?

Hans,

why not test FT8 Radio app? it does support QDX "officially". Prolly you may still need a powered hub though.

I am tempted, but messing with OTG/Power issues/Portable hub hold me back so far.

Anyone else did test it already?

Giuseppe Marullo
IW2JWW - JN45RQ

Thanks Alan :)

73 Ian

On 06/02/2023 08:40, G0VGS via groups.io wrote:

It does appear, however, to be slightly off frequency. ?The reference frequency is set to default (27.004).

Ian

Yes, section 8.5 in the manual gives the clue.
It can be done by careful calculation or "try it and see".

73 Alan G4ZFQ

Hi Richard,
have you done the 4 capacitor short-out that prevents lockup and the track cut for rev 3a boards?I found high rx current ‘weirdies’ before I did these mods.
The input analysis only shows a signal while you are actually transmitting, and not using a VNC remote control if you have this.
73 Ken g4apb?

Hi all,
My first time here. ?Be gentle ;)
I just built my first QCX on 40m. ?It works wonderfully well! ?It does appear, however, to be slightly off frequency. ?The reference frequency is set to default (27.004). ?Can I use this to try and dial in the frequency without issue? ?I have my K3/P3 to help me.

73 Ian

On 06/02/2023 07:43, Jon Pike wrote:

Jon,
What version of QDX are you using? This thread started long ago with a v1 which is not too good in IQ mode.

Without a screenshot or information as to what you are looking at I have to guess your soundcard is not stereo, or not set to stereo?

73 Alan G4ZFQ

Ok, it dawns on me that I probably should be enabling the I/Q output, vs the soundcard audio?? Tried that... hey,? I now seem to see a 40something khz wide chunk of spectrum!? OK...? But, I'm still seeing the FT8 signals repeating along every so often, like images, rather than others I'd expect if I'm tuning properly...
so something's not right.

Ok, it dawns on me that I probably should be enabling the I/Q output,? vs the soundcard audio?? Tried that... hey,? I now seem to see a 40something khz wide chunk of spectrum!? OK...? But, I'm still seeing the FT8 signals repeating along every so often, like images, rather than others I'd expect if I'm tuning properly...
so something's not right.

Bringing up this one again...??

I gave it a try,? entered a frequency number of 12, uh, Hz,? since I wasn't paying close attention,? then thought that was the issue and changed to 12kHz.? And a bit wider,? but found all gave me the same odd response.? I see a DSB kind of output, with the notch at tuning freq.? I get about 3Khz wide bands on either side of the center freq notch.? Changing bandwidth,? changing the frequency number, etc doesn't seem to change that.? I don't see any signals beyond that upper and lower 3khz from tuning freq.?? Tuning up and down seems to have the notches appear every 30khz or so,? nothing inbetween.

It's a bit late to try to wrap my head around what I'm seeing here...? maybe the OmniRig isn't controlling properly,? maybe something else isn't set right.
I don't see an attachment or pic,? Mark... so I can't compare with what you are seeing.? Definitely not a 24 or 48khz stretch of band.

Thank you, Ron. I checked all of those voltages and saw that 5, 6 and 8 were measuring 0.9 v. All of the wires on the T50-2 toroid had continuity but one or more must have had some amount of excessive resistance from incomplete enamel removal. I reheated these toroid wires once again and the voltages popped up to 2.5v and the BPF amplitude scaling factor jumped up to 08-09.

I think I am all set. Thank you!

On 5 Feb 2023 at 22:37, Shirley Dulcey KE1L wrote:

A 7.8 magnitude earthquake hit Turkey today. I hope Hans is safe!

Hans was on holiday in Britain with family, but let's hope
his staff back in Turkey were not affected.

Sorry if I've missed this, but what are the jumper placements for 630M and below?? Probably on page 1 or something.? Thanks? N0UU

I may have missed it on this list, but Hans looks to be speaking at FDIM again this year.? The attendance list is growing.? This again should be one of the best presentations of the year.? N0UU

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Hans and family live in southwestern Turkey, and the quake was in southeastern Turkey, so Mugla may not have been effected much. ?Who knows where the vacay was taking them, though. ?

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