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Reviews For: QRPGuys K7QO Marker Generator

Category: QRP Accessories

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Review Summary For : QRPGuys K7QO Marker Generator
Reviews: 1MSRP: 15.00
Description:
The generator uses a Microchip 12F508 microprocessor to
generator square waves at either 50kHz, 25kHz, 10kHz, or
5kHz intervals (toggle switched between intervals). These
square waves are rich in harmonics that can be easily
heard in receivers from 50kHz thru 150MHz.
Product is in production
More Info: http://https://qrpguys.com/k7qo-marker-generator
# last 180 days Avg. Rating last 180 days Total reviews Avg. overall rating
0015
NC4RT Rating: 2019-07-01
Very nice item, easy kit Time Owned: 0 to 3 months.
I had one of the VE3DNL Frequency Markers for years, but lost it, and so replaced it with this.

The kit is a very easy build... all the components are regular through-hole, no SMT. Under 20 parts all told. It would be an OK "first time" project. Just be sure you have a fairly small tip for the soldering iron, and some magnifiers would probably be a good idea.


It worked on the first try. (You supply a few items, like the coin battery, an enclosure if you want one (doesn't really need one).

In mine, the marker spikes are fairly convenient... The "center" of the spike varies a little. depending on whether you've chosen the 50, 25, 10, or 5 kHz separation. But you can easily find a marker near whatever band edge or beacon you want.

The marker spikes tend come in pairs.. a given spike will be either stronger or weaker in amplitude, and its immediate neighbors will be the other... Weak, Strong, Weak, Strong, etc.

It's quite small, perhaps 2" x 2" approx. Easily fits in an Altoids tin with plenty of room to spare.

It's supposedly possible to calibrate it (to WWV e.g.) using the trim capacitor. I wasn't able to get it spot on, but got within 250 Hz at 10 MHz. Still, it's a little off at higher frequencies... about 750 Hz high at 10 meters.