Hi John, Changing the value from 20 to 23 in menu will not alter output power at all, to adjust power you would either have to increase pa bias or increase the pa voltage. Andy

Hi Stephan, The counting is simply because the time has not been set in the menu, I assume you are not using the gps? As for power, this could be a number of things, check that you have it biased prop

#20m #error

Hi Bill, No, you do not need a filter in 0 and the u3s schematics are incomplete. Andy

Just a thought, have you tried using the buttons on the pcb instead of the case mounted buttons? Andy

If I remember correctly it is possible to have a calibration sequence after each tx slot. I THINK that if a wspr transmission slot is set at 2 minutes and a calibration of 50 seconds is used it should

When I mount lcd screens remote from the pcb I make up my own cables using Dupont pins and housings, make it to whatever length is needed. They are available ready made in various lengths and choice o

Hi Julian, before you go much further with the build I'd correct the mistake with the synth board else you'll get an error message. Hint, orientation. 73 Andy

I listened to the oscillator in the ocxo and it was heard nicely on an 817, so suspected it was the main chip, luckily I had a spare. Popped it in and it fired up nicely, sort of. I had a heartbeat bu

lightning strike close by and my u3s died, second one to do this. Unit is very hot, just the heartbeat symbol on screen, not flashing. Blue backlight on. GPS working fine. If I reboot it I get the spl

My u3s has 3 bs170's at 5v, I have no problem getting to Tasmania or South Pole with it. Power out is around 1w on 7mhz, running at lower voltage and bias only just increasing current has resulted in

Hi Steve, it may be the light but the solder joints on the bs170 look as if they could do with reflowing , particularly the gate. I don't think your too far away from a working unit. Good luck Andy

It looks like an Argo screen grab, used by qrss receivers. The wobbly traces will most likely be wspr. The balloon glyph and number have recently been observed as being transmitted from balloons. Andy

Hi Andy, Paul, M0BMN, sent me a board and bits to make a multi band wspr transmitter with an arduino nano controller, no GPS or lcd screen. Band is set by toggle switches and a reset push button to st

Should be ok. I seem to remember a couple of seconds out is acceptable, I run my u3s with a GPS so don't have an issue. The other day I was set up to receive wspr and was seeing signals on the sdr wat

Their website has improved then, I went to look recently and there was an hour queue to view the website. Andy

I use eneloop cells charged by a Powerex MH-C9000 WizardOne charger-analyser. Excellent piece of kit, charges, discharges, refresh and analyse, break in and cycle operations, 16 selectable charging cu

Hi Dave, as its 20m your problem is most likely to be the caps on the lpf board, search the forum and you'll find several references to it. I can't remember which ones off the top of my head but it's

Hi Dave, what band and do I read it that the output power increases 200mW during the tx period? Eg it starts at say 400mW's at the beginning and then rises to 600mW's? what voltage is the fed to the p

Hi Paul, looking at your photo of the led screen the last pin looks like a poor soldered joint, I believe that this pin, and the one next to it, are connected to the contrast adjustment resistor. Id r

#qcx40

Hi Jerry, with one bs170 at 5v you should be seeing just over 100mA on idle and 200 ish mA on tx. Have you set the pa as stated in booklet? Also I think you may be confusing what the information on th