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Ripples in the Ether

Emanations from Amateur Radio Station NT7S

Category: VRX-1

Junkbox

No earth-shattering news to report on the blog, but a few little things to mention (hence the “junkbox” title). The CC-20 Beta 1 test is proceeding pretty much as planned. As of tonight, AA7EE has his receiver up and running now and a couple of the others are close behind. I’m eagerly awaiting the results… Read More Junkbox

16 September 201116 September 2011 Jason MilldrumLeave a comment

Curing Common Mode Hum in the VRX-1

As I’ve previously noted, the VRX-1 is a nifty little basic direct conversion receiver, but it has some shortcomings that could be problematic under certain circumstances. Here’s a story of one of those issues and the cure that was found. Dave AA7EE purchased and built a VRX-1 kit a while ago but was never fully… Read More Curing Common Mode Hum in the VRX-1

6 July 2011 Jason Milldrum5 Comments

KE7GKM VRX-1 Update

As you may recall in a previous post last December, I made a QSO with, then received a cool e-mail from Bob KE7GKM about his quest to make 100 QSOs using a lashup of a VRX-1 and a homebrew QRP transmitter. Bob kindly sent me an update on his progress: Hi Jason, This is just… Read More KE7GKM VRX-1 Update

28 February 2011 Jason Milldrum1 Comment

This Is What Radio Is All About

Over the last few days, Jennifer has been off work, so I’ve been able to spend more time in the shack working on Project X. I only recently made my first QSO with the prototype rig (I think propagation was unfavorable for me when I was trying late in the evenings), so I’ve been leaving… Read More This Is What Radio Is All About

22 December 201022 December 2010 Jason Milldrum6 Comments

DIY Isolated Jack

The VRX-1 receiver kit uses a TDA7052 audio amplifier IC, which is a bit different from your run-of-the-mill LM386. Because of its push-pull output, if you use a phones jack, you must isolate it from ground. This isn’t something you have to worry about if you use a non-conductive enclosure or if you have an… Read More DIY Isolated Jack

8 September 200925 September 2009 Jason Milldrum5 Comments

Introducing the VRX-1

While I was away on my honeymoon, I noticed that the upcoming kit that I’ve been hinting about for months has finally been released. The Four State QRP Group announced availability of the VRX-1 direct conversion receiver. The VRX-1 is a simple 40 meter VXO-tuned receiver (crystal on 7.030 MHz), but it’s not your typical… Read More Introducing the VRX-1

1 September 200925 September 2009 Jason Milldrum2 Comments

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About This Blog/Bio

You've arrived at the blog of Jason Milldrum, NT7S. It's mostly related to amateur radio (especially homebrewing and QRP) but occasionally other topics will pop up when they strike me as amusing. The QTH is in Oregon wine country. Husband of Jennifer, dad of Noah and Eli. Butler to a pair of cats and a rescue Beagle.

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