Tag Archives: Ivan Cholakov (NO2CW)

Thomas (N1SPY) explores the world of non-directional beacons (NDBs)

Many thanks to SWLing Post contributor, Ivan Cholakov (NO2CW), who shares the following:

Thomas, N1SPY did a follow up video [to this previous post] where he explained a few details about NDBs (Non Directional Beacons).

I knew they existed but had no idea about their historical significance.

Click here to view on YouTube.

Another excellent and informative video, Thomas! Thank you for sharing and keep up the good work!

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Ivan checks out the Kenwood TH-D74’s mediumwave performance

Many thanks to SWLing Post contributor, Ivan (NO2CW), who writes:

One category of receivers not much talked about are the wideband handhelds. I first owned one of those in 1992 when I paid a ton of money for an AOR-1000. Not only did it cost me a lot but I also ordered it from the UK so it was not subject to the “cellular blocked” rule. Don’t ask me why, it never made any difference in the end.

As a busy shortwave listener at the time I was eager to check out reception as the radio also featured Shorwave coverage and even a BFO (Beat Frequency Oscillator) knob! To sum it up it was a great receiver above 30 mHz but Shortwave and Mediumwave was barely there, with a 15 kHz wide filter and low sensitivity.

Well today I have in my hands a Kenwood TH-D74A – a top of the line handheld triband amateur radio transceiver with Medium Wave and Short Wave coverage. The radio is expensive due to the presence of GPS, D Star and APRS, but those are a features for the radio amateur. What about performance on the low frequencies?

Here is my video of the test which revealed surprising results:

Click here to view on YouTube.

So next time you consider purchasing a new receiver,as you dive into the choice of portables, SDRs, tabletops and classics from eBay you may consider adding this category as well – handhelds with wide band coverage.

Thank you, Ivan!  You’ve inspired me to check out mediumwave performance on a few wideband handy talkies I own: the Yaesu VX-3R, Yaesu FT2DR and the Kenwood TH-F6A. To my knowledge, all three have internal ferrite bars (tiny ones) but I’ve never actually compared their performance with each other. That could be a lot of fun. I also own an AN200 MW loop antenna so this could be an excellent test to see how it pairs with each radio.  I’m especially curious about the wee VX-3R!

Thanks again, Ivan. We always enjoy your videos and posts.

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Video: N1SPY brings a GE seven band radio back to life!

Many thanks to SWLing Post contributor, Ivan Cholakov, who writes:

Thomas Cholakov (N1SPY) picked up an old General Electric radio from the 2019 Orlando Hamcation and brought it back to life. Unfortunately with all of the radio’s 7 bands, it did not have shortwave.

Click here to watch on YouTube.

Brilliant job resurrecting that GE portable, Tommy!!! Thank you for sharing.

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More info about Eneloops and avoiding counterfeits

Following our post yesterday regarding Eneloop rechargeable cells, SWLing Post contribtors Guy Atkins and Ivan Cholakov both warned of numerous fake and counterfeit batteries available from sellers on eBay and elsewhere. Ivan notes:

Please be aware Eneloop batteries are widely copied and there are many many fakes out there. You should only buy them from a reputable source.

Thank you for that warning, Ivan!

Guy also comments:

I use Eneloop Pro AA batteries in small portables. The newest version of the “Pro” comes in a 2500 maH size and retains 85% of the charge for one year. The downsize is that this model is “only” good for 500 recharges. A useful comparison chart is here: https://en.wikipedia.org/wiki/Eneloop

[…]Here is a FAR more comprehensive page of Eneloop model & version comparisons, charts, FAQs, tips, warnings, etc.: https://eneloop101.com/batteries/complete-lineup/. This web site also contains warnings about Ebay fake Eneloops, and other useful details…probably more than most people want to know but if you want to make the most informed choice, check it out!

Many thanks to both of you for sharing. I agree that purchasing Eneloops from a reputable seller is incredibly important. For one thing, if you plan to invest in Eneloops, there is no rationale to buy something sub-standard. Additionally, I do worry about counterfeit cells having an unstable chemistry which could result in overheating or fire.

Click here to read our original Eneloop article with links to reputable sellers.

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Aeronautical RDS: Ivan’s impressive collection of in-flight FM stations

Many thanks to SWLing Post contributor, Ivan Cholakov (NO2CW), who writes:

Last week I took an Eton Satellit with me on a flight from Tampa, Florida to Washington DC. The radio is very light, portable and packed with features. I have used an SDR radio before for inlight FM reception where I recorded audio, but this time I decided to only count stations with an RDS lock. With so many signals battling RDS is tricky to catch as every 10 seconds or so one station comes on top of another. The flight was just short of 2 hours and I divided my logs into three 30 minute segments. Not suprisingly looking into the technicalities I noticed RDS is commonly received from stations 50 -100 kW of power and tall towers.

Interestingly signals seem to be stronger a lower altitudes. My theory is that FM broadcast antennas heavily favor gain on the horizontal plane parallel to the terrain and send as little signal as possible out into space. I overlaid my logs onto three maps and also a video:

Click here to view on YouTube.

Impressive Ivan! I’m taking a flight later this month and might even try this with the FM radio built into my Moto G6 smart phone which also includes RDS (although I doubt reception can match that of the Satellit.

This is fascinating, Ivan! Thank you for sharing.

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Thomas (N1SPY): How to chase Cubesats with an RTL-SDR dongle and some wire

Many thanks to Ivan (NO2CW) who writes:

Thomas, N1SPY used equipment worth $25 to chase mini satellites. Includes instructions for making a simple circularly polarized antenna. Did it work? Check for yourself!

Click here to view on YouTube.

Thanks, Ivan, for passing along another excellent project by Thomas (N1SPY). I love how simple this project is to put together and the fact that most SWLing Post readers, for example, likely have all of the components already! Great job, Thomas!

Click here to check out other projects by N1SPY.

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Ivan performs two tests with the AirSpy HF+

Many thanks to SWLing Post contributor, Ivan Cholakov (NO2CW), who shares the following:

Thomas, there has been a lot of discussions regarding Airspy HF+ ever since it came out – heated exchanges regarding comparisons with peers, modifications and firmware updates.

I took my Airspy HF+ and conducted two tests with it:

Airspy HF+ vs. SDRPlay RSP-1A on HF and Medium Wave

Click here to view on YouTube.

Since I could not completely equalize the audio levels, I think it’s good to look at the peak to valley ratios on the display rather than the audio volume.

Airspy HF+ with the R3 mod on and off:

Click here to view on YouTube.

This comparison used SDR #. It may be helpful to run the same comparison on SDR Console V3. I may do that at a later time.

Both tests used W6LVP’s portable amplified receiving loop antenna in a noisy suburban backyard in Florida.

Many thanks, Ivan, for sharing these comparison tests! I agree with you that it’s most helpful to look closely at the peak to valley ratios on the spectrum display rather than using the audio levels as a measure.

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