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Got it built, but need some audio tweaking.


 

I finally got the thing built, a V5, and with some trepidation, powered it up, fully expecting to see smoke coming out the cabinet. Oddly, I got sound out the speaker, albeit "tinny".? (I was a bit surprised that there was no backlight on the panel, but I do not see why there would be, but a flashlight fixed this.)

Though I could tune in on a signal, I could not zero in on a SSB signal, as it sounded like a toy. The speaker was a Nagoya I got for my mobile FT-7100M, which worked fine for that, but not for this. I think it is 8 ohm, possible 4 ohms.
I went and dug up my MFJ headset, and put it on, and the sound was a little better - was able to copy WWV code bulletin on 40. (Well, I was able to hear it - copying 18 WPM is quite another matter.) I did discover that the passband is likely for SSB, as I was hearing several stations at once, sort of like one of my old Swan rigs with no CW filter. (As a Novice, I got good at using my brain as a filter, as I did not have a rig with a CW filter until around 2014.)

Is there an impedance I should be looking for in speakers? The Nagoya is 8 ohm, as are most external speakers, or do I need an amplified speaker, or a certain type of headphone?

Please understand, I did not expect earthshaking results from an absolutely rock bottom affordable kit, and know I will have to "tweak" a bit before it works right.

Thanks everyone! 73 es gud dx!
--
Alex Netherton, W5ALX
Buncombe County NC, EM85ro


howard winwood G4GPF
 

Make sure you have set the bfo, a common failing of quite a few of us.
It does NOT come factory set.
G4GPF


 

Oh dear, are there instructions for that? I was under the impression that it was indeed ready to operate. Thanks!

Now for a BFO setting search...

--
Alex Netherton, W5ALX
Buncombe County NC, EM85ro


 

Please check out this message, as well as search the site for other calibration information.
/g/BITX20/message/74193?p=,,,20,0,0,0::Created,,v5+bfo,20,2,0,69331706

You will need a dummy load if you want to adjust the master clock (frequency calibration) using the stock software.? Transmitting on 10.000 MHz is not legal, and the stock v5 software does go into transmit mode on that frequency.? v5 stock firmware is the only version that I know of that uses this technique. I believe that v6 went back to using an AM signal and zero beating on receive as the prior versions did as well.

I have found the audio spectrum analyzer the best way to adjust the BFO.? HF Signals now provides a web page to help with that.? See the link in the prior message above.

73
Evan
AC9TU