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Nich, Clock 2 is not relevant on TX. I note the scope, Hantek. USB? What is the output frequency at the antenna? Best check with a counter or RX. 73 Alan G4ZFQ

Hi Dan, Thanks for your reply - if you mean in the Band configuration menu, then only 1 column of band settings was showing rather than the expected 6. I say “was showing” because the unit is

Hans, Sorry I meant to answer this bit - at Clk0 & Clk1 on IC4 and Clk2 at R19 Regards Nick M0HGU -- A lot of people and the smell of sausages meant a performance of the street theatre that was

Morning Hans, Indeed I don't know how it is possible but - evidence attached. Rx_clocks is Clk0 & Clk1 at rest Rx-ing in the 40M band - correct frequency and phasing. Tx_clocks are the same signals

I measured again with the oscilloscope. A lso at CLK 2 directly at the IC 204 the frequency is about double the set frequency. I s there any other explanation than a defect in the IC204? 73 - J?rg,

Hi Paul, The idea is to use either a resistive bridge sensor ahead of the tuner like in this one from 4SQRP: http://www.4sqrp.com/kits/4stuner/4stuner_schematic.jpg That limits the worst-case SWR

too bad I missed you Chris. I was calling cq on 20 and had also quite some RBN reports. Are you on the discord site ?https://discord.com/channels/825115505563402261/832569698213953586 Martin DK3UW

I've been using a tuner for years without problems, the bs170's are more robust than you indicated, how on earth can you tune a manual tuner faster than an auto tune which takes a few

Hi Alan The ADC analog section runs on 5V. It has a +/- 2.5V differential analog input (0-5V with a +2.5V DC bias). The reason I powered the LM4562 from 5V was because I was scared that if anything

And also the voltage swing is not required driving into the 3.3 volt ADC. 73 Alan G4ZFQ

Thanks for clarifying that, Hans. Yes, it makes sense to power those small signal audio amplifiers from the 5V rail - nicely regulated by a linear regulator instead of from the potentially

Hi Giuseppe, There is no sure way other than to try to isolate the problem.? If it is the MPU, the only choice is a new kit (you can save the cost of a new enclosure).? I did this by removing all

Hi Joe, You can measure the power output 2 ways: 1 - With a QRP SWR/Power meter like this one: https://qrpguys.com/qrpguys-power-swr-dummy-load 2 - By measuring the voltage on a dummy load like this

good morning everyone, my QMX also no longer works, I replaced the two power boards and it only turned on for a few seconds to be detected by the PC, then it turned off and never turned on again. How

Hello Graham There is no wait for QDX kits. I had just forgotten to remove the message on the shop page. I've removed it now. All QDX kits are shipping normally within 1 business day. Assembled

Hello Nick Where and how are you measuring this? Not right! Hardly even possible :-/ I'd suggest a factory reset but you've already done that. So how are you measuring Clk2 and ARE YOU SURE

Opps, that is prebuilt IF desired. 73, Cliff, AE5ZA

If I may make a suggestion, try a N7VE SWR bridge. the design provides at least a measure of safety for the finals, then when your Antenna tuner is adjusted to satisfaction, switch the bridge out of

Hi Peter IC7 and IC9 are the two unidentified chip supplies on the VCC (+5V) rail. Apologies for the confusion, the PCB CAD library for these op-amps doesn't seem to label the IC at the power

BE SURE you have a dummy load or an antenna connected. Then use ever QRP watt meter you have. My dummy load has a SWR meter built in. 73, Cliff, AE5ZA