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Pricing is not for the faint of heart–at time of posting, prices ranged from $395 to $23,000 US. Each radio is beautifully presented, with a full description, and carries a one year restoration warranty. For an additional $95, many models can be modified with an AUX in audio jack.
While these radios are well outside my meager vintage radio budget, I must say that I’ve thoroughly enjoyed looking at the photos and reading the descriptions.
The Mighty KBC will be making their seasonal move to 7,375 kHz on Sunday September 6, 00:00 – 03:00 UTC.
The Mighty KBC’s Giant Jukebox is an easy catch for listeners in much of North America and Europe–if you’ve never heard the show, you’re certainly in for a treat.
“Do what I did a couple of years ago and add a lobster claw rubber band to the [PowerMate] tuning wheel.”
In case you’re not familiar, Mike is referring to the thick, wide rubber bands that are placed on lobster claws to hold them shut. Mike included the following video; you can see that the rubber band fits perfectly around the top of the tuning knob, giving it a little extra grip.
https://www.youtube.com/watch?v=gtlDMSpaj4c
This same type of rubber band can often be found in the produce department of grocery stores as it’s used to hold bunches of broccoli, asparagus and other produce together.
The lighter shaded side of the AM carrier indicates a lower sideband sync lock. (Click to enlarge)
A few days ago, I tuned to 9,420 kHz and found a relatively strong signal from the Avlis transmitter site of the Voice of Greece. The broadcast was quite clear until a heterodyne (het) tone popped up out of nowhere.
I checked the spectrum display of my Excalibur to find two steady carriers located about .5 kHz off each side of VOG’s AM carrier. I assume this may have been a faint digital signal centered on the same frequency as VOG.
The noise was annoying, but SDRs (and many tabletop radios) have tools to help mitigate this type of noise.
The het tone was originating from both sidebands of the VOG AM carrier (see spectrum display above). I had planned to use my notch filter to eliminate the noise, but I had two carriers to notch out and only one notch filter.
Synchronous detection to the rescue…
The simple solution was to eliminate one of the carriers using my SDR’s synchronous detector which can lock to either the upper or lower sideband. In this case, it didn’t make any difference which sideband I locked to because both had similar audio fidelity and were otherwise noise free. In the end, I locked to the lower sideband, thus eliminating the het in the upper sideband.
Next, I enabled my notch filter and moved its frequency to cover the annoying het carrier in the lower sideband; I kept the notch filter width as narrow as I could to preserve VOG’s audio fidelity. You can see the notch filter location and width in the spectrum display above (the notch filter is the thin yellow line).
I should note here that the great thing about using an SDR–or tabletop receiver with a spectrum display–is that you can see where the noise is. I was using my WinRadio Excalibur, but pretty much any SDR in my shack could have handled this task.
The results? No het tone and I was able to preserve the great audio fidelity from the Voice of Greece broadcast!
Here’s a 3.5 hour recording I made after cleaning up the signal. I believe at one point in the recording, I switched off the notch filter to demonstrate how loud the het tone was:
Icom introduced a new general coverage transceiver this year at the Tokyo Hamfair: the Icom IC-7300.
Icom has released a preliminary spec sheet (click here to download), but no pricing information yet. The IC-7300 will most likely be the least expensive Icom transceiver with a full spectrum display.
At first glance, I like the form factor and touch screen display–the panel appears to be less cluttered than many other large-display models. The ‘7300 has dedicated knobs for passband tuning and AF/RF gain (major plus in my book). It also comes with a built-in automatic antenna tuner.
I’ll post more info once Icom releases pricing and availability.
Many thanks to SWLing Post reader, Paul Walker, who writes:
I am a radio personality here in the USA as well as a SW and MW DX’er.
I appeared on the 11092.5 USB during Radio Saint Helena Day 2009 and have several short recordings, which are attached. That’s my voice doing the station identification/promotional announcements.
Sample 1
Sample 2
Very cool, Paul! It’s quite amazing to hear studio quality audio from Radio St. Helena Day as so many of us had to strain to hear their signal from across the Atlantic! Glad you were able to be a part of such an amazing little station.
I miss those Radio St. Helena Days and, though I know it’s doubtful, certainly hope the station considers firing up a shortwave transmitter again.
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