QRPer Notes: QSO Today Expo This Weekend, IC-705 Current Drain Explored, and DX Commander Channel Removed from YouTube

Because I receive so many tips from readers here on QRPer, I wanted way to share them in a concise newsletter format.  To that end, welcome to QRPer Notes, a collection of links to interesting stories and tips making waves in the world of radio!


QSO Today Ham Radio Expo, March 12-13, 2020

Many thanks to Vince (VE6LK) who reminds us:

QSO Today Ham Expo is THIS WEEKEND starting on Friday evening MT and early bird tickets are only $10 until the event opens Friday evening. Drop by through the weekend and find me in the Ham Radio Workbench Lounge in between presentations of course. Your entry fee gets you 30 days of video replay for those presentations you can’t see live.

Click here to visit the Ham Radio Expo and register!


KU3X Explores IC-705 Current Drain and Battery Packs

Many thanks to Barry (K3UX) who writes:

Thanks partially to your feedback, I purchase the IC-705 and I am one happy camper.

Icom states the current drain on receive for this radio is between 500 and 800 ma. So I tested the radio.

At 13.8 volts of supply voltage, the radio draws 200 ma on receive. What? At 12 volts the radio draws 225 ma on receive and at 11 volts, like off of a 3 cell LiPo battery the radio draws 250 ma.

When I made these tests, I removed the Icom clip on battery. Now going down to 8.4 volts, the radio draws 335 ma on receive.

So here’s the fly in the ointment: At 8.4 volts from the external supply, the radio would not transmit. It would not transmit at any voltage under 10 volts.

Conclusion….. there has to be a boost circuit built into the radio that goes between the battery and the radio. So to boost the battery voltage you will draw more current.

I posted my findings on my web page.

Thank you for sharing this, Barry! Funny enough, I’ve never thought to check current without the battery attached, but that makes sense. This would give us data knowing the radio isn’t using more current to recharge the battery pack at the same time. 

Typically, the lower the voltage, the higher the current drain and vice-versa. Also, I believe you’re correct in that there would be some extra consumption with the voltage booster in play. 

Thanks for sharing this!


DX Commander channel (temporarily?) removed from YouTube

A number of friends and readers have reached out to note that the DX Commander YouTube channel hosted by Callum (M0MCX) has been completely removed from YouTube. 

Callum’s channel is incredibly popular and this removal has everyone scratching their heads, so it’s no surprise there’s wild speculation floating around out there. Don’t fall into that rabbit hole.

I fully suspect that this is simply an error on Google/YouTube’s part and that his original channel will eventually be reinstated. 

In the meantime, Callum has started a second/backup channel where he’s posting content. Click here to check it out.

When his original channel is reinstated, you’ll find it here.

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