Сайт «YouTube — Mile Kokotov»

RSPduo in CW CQ WPX Contest 2018 [00:05:24]

The New SDRplay RSPduo Dual tuner SDR-receiver, receiving CW in CQ WPX Contest 2018. This excellent SDR-receiver can receive in single tuner or dual-tuner mode, so you can monitoring or recording any two bands simultaneously. It is perfect option for 2-band monitoring in Contest for example...

SDRplay RSPduo — The Cherry on the Cake — Short Review [00:04:31]

RSPduo is a new SDR receiver from SDRplay. The RSPduo is a dual-tuner wideband 14-bit SDR receiver which covers the entire RF spectrum from 1kHz to 2GHz giving up to 10MHz of spectrum visibility.
Combined with the SDRuno software, this SRD receiver with its two totally independent tuners, can simultaneously receiving, monitoring and recording two separate 2MHz bands of spectrum, anywhere between 1kHz and 2GHz.
In single tuner mode, RSPduo can receive, monitor and record up to 10 MHz of spectrum at a time.
The RSPduo provides three software selectable antenna inputs. All it needs is a PC and an antenna to provide excellent communications receiver functionality.
The RSPduo Covers all frequencies from 1kHz through VLF, LF, MW, HF, VHF, UHF and L-band, up to 2GHz, with no gaps.
This quality SRD receiver has 14-bit Analog to Digital Converter with excellent dynamic range, and definitely it is not another 8 bit USB-dongle

РАДИОАМАТЕРСТВО — Хоби за 21 век [00:05:55]

This is excellent RSGB video "Amateur radio - a 21st Century hobby"
I have just translated it to Macedonian language.
Great for Amateur radio presentation and introduction to youngsters

Z33T Radio Beacon Automatic Keyer PIC16F84 [00:03:17]

This is Programmable Automatic Radio Beacon Keyer with PIC16F84 microcontroller.

Airspy HF+ vs SDRplay RSP1A Comparison on FM Broadcast Band [00:10:57]

In this video I am comparing two popular SDR-Receivers (Airspy HF+ and SDRplay RSP1A) on FM Broadcast Band.
I have made few recordings with every receiver with the same antenna trying to set the best SNR = signal-to-noise ratio.
My intention was to ensure the same conditions for both SDR`s in order to make as fair as possible comparison.
No DSP enhancing on the SDR`s was used.
Antenna was Vertical Dipole.

When receiving signals are strong enough, You should not expect the difference between most receivers to be very obvious!
If you compare one average transceiver (which cost about $ 1000 USD) and top class transceiver which cost ten times more, the difference in receiving average signals will be very small too. Almost negligible! But when you have difficult conditions, the very weak signal between many strong signals, than the better receiver will receive the weak signal readable enough, but cheaper receiver will not. Today it is not a problem to design and produce the sensitive receiver, but it is far more difficult to design and produce high dynamic receiver for reasonable price! The Airspy HF+ and RSP1A are very very good SDR-receivers. They have different customers target and have strong and weak sides. For examle Airspy HF+ has better dynamics in frequency range where it is designed for, but RSP1A, on the other hand, has broadband coverage...


VIDEO CONTENT:

00:00 to 00:18 = Intro

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00:18 to 00:48 = RSP1A receiving Very strong signal of Local Radio Station on 106.4 MHz, with 192 kHz WFM Filter.

00:48 to 01:24 = Airspy HF+ receiving Very strong signal of Local Radio Station on 106.4 MHz, with 192 kHz WFM Filter.

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01:24 to 02:01 = RSP1A receiving Very strong signal of Local Radio Station on 107.6 MHz, with 192 kHz WFM Filter.

02:01 to 02:38 = Airspy HF+ receiving Very strong signal of Local Radio Station on 107.6 MHz, with 196 kHz WFM Filter.

02:38 to 02:59 = RSP1A receiving Very strong signal of Local Radio Station on 107.6 MHz, with 192 kHz WFM Filter.

02:59 to 03:21 = Airspy HF+ receiving Very strong signal of Local Radio Station on 107.6 MHz, with 196 kHz WFM Filter.

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03:21 to 03:42 = RSP1A receiving Weak signal of Radio Club FM from Skopje on 103.4 MHz, with 120 kHz WFM Filter, no Noise Reduction.

03:42 to 03:54 = RSP1A receiving Weak signal of Radio Club FM from Skopje on 103.4 MHz, with 120 kHz WFM Filter, Noise Reduction is switched ON.

03:54 to 04:16 = Airspy HF+ receiving Weak signal of Radio Club FM from Skopje on 103.4 MHz, with 120 kHz WFM Filter, no Noise Reduction.

04:16 to 04:31 = Airspy HF+ receiving Weak signal of Radio Club FM from Skopje on 103.4 MHz, with 120 kHz WFM Filter, Noise Reduction is switched ON.

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04:31 to 05:02 = Airspy HF+ receiving Very weak signal of Radio BUM from Kumanovo on 104.2 MHz, with 96 kHz WFM Filter.

05:02 to 05:29 = RSP1A receiving Very weak signal of Radio BUM from Kumanovo on 104.2 MHz, with 120 kHz WFM Filter.

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05:29 to 06:04 = RSP1A receiving Very weak signal of Radio Metropolis from transmitter in Tetovo on 104.3 MHz, with 120 kHz WFM Filter.

06:04 to 06:36 = Airspy HF+ receiving Very weak signal of Radio Metropolis from transmitter in Tetovo on 104.3 MHz, with 120 kHz WFM Filter.

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06:36 to 06:59 = Airspy HF+ receiving Very weak signal of Radio ZONA M1 from transmitter in Skopje on 104.4 MHz, with 120 kHz WFM Filter.

06:59 to 07:25 = RSP1A receiving Very weak signal of Radio ZONA M1 from transmitter in Skopje on 104.4 MHz, with 120 kHz WFM Filter.

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07:25 to 07:47 = RSP1A receiving weak signal of Radio Bubamara from transmitter in Skopje on 105.2 MHz, with 192 kHz WFM Filter.

07:47 to 08:16 = Airspy HF+ receiving weak signal of Radio Bubamara from transmitter in Skopje on 105.2 MHz, with 192 kHz WFM Filter.

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08:16 to 08:48 = Airspy HF+ receiving weak signal of Radio Kanal-77 from transmitter in Coco Peak, near Kladnik village, on 105.5 MHz, with 192 kHz WFM Filter.

08:48 to 09:16 = RSP1A receiving weak signal of Radio Kanal-77 from transmitter in Coco Peak, near Kladnik village, on 105.5 MHz, with 192 kHz WFM Filter.

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09:16 to 09:36 = Airspy HF+ receiving weak signal of Radio Antenna-5 from distant transmitter on 106.9 MHz, with 120 kHz WFM Filter.

09:36 to 09:55 = RSP1A receiving weak signal of Radio Antenna-5 from distant transmitter on 106.9 MHz, with 120 kHz WFM Filter.

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09:55 to 10:26 = RSP1A receiving weak signal of Radio 5-FM from Veles on 107.1 MHz, with 120 kHz WFM Filter.

10:26 to 10:56 = Airspy HF+ receiving weak signal of Radio 5-FM from Veles on 107.1 MHz, with 120 kHz WFM Filter.

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Mile Kokotov, Z33T

SDR Receivers Comparison on VLF, LW and NDB band [00:10:38]

SDR-Receivers Comparison on VLF, LW and NDB-band
*** Airspy HF+, SDRplay RSP1A and ColibriNANO ***
In this video I am comparing three SDR-Receivers. I have made few recordings with every receiver with the same antenna and choose the best one (one with the best SNR = signal-to-noise ratio). My intention was to ensure the same conditions for all three SDR`s in order to make as fair as possible comparison. For example, I was set the frequency span displayed on the window to be as same as possible for all three receivers. The vertical axis for the signal stregth, was set to be equal (in decibels) too.Airspy HF+ and ColibriNANO was set to their minimum sample rate (48 kHz).
RSP1A was set to minimum sample rate (2 MHz and 8 decimation).
No DSP enhancing on the SDR`s was used except APF (Audio peak filter) on ColibriNANO (I forgot to swith off).

VIDEO CONTENT:

00:14 to 00:35 = ColibriNANO receiving VLF ALPHA signal on 14881 Hz (43 kHz frequency span window and 800 Hz CW

filter bandwidth)

00:35 to 01:00 = RSP1A receiving VLF ALPHA signal on 14881 Hz (30.5 kHz frequency span window and 750 Hz CW filter bandwidth)

01:00 to 01:36 = Airspy HF+ receiving VLF ALPHA signal on 14881 Hz (33 kHz frequency span window and 800 Hz CW filter bandwidth)

01:36 to 01:58 = ColibriNANO receiving VLF ALPHA signal on 14881 Hz (23 kHz frequency span window and 800 Hz CW filter bandwidth)

01:58 to 02:25 = Airspy HF+ receiving VLF ALPHA signal on 14881 Hz (23 kHz frequency span window and 800 Hz CW filter bandwidth)

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02:25 to 03:06 = RSP1A receiving LW Broadcast station with very weak modulation on 162 kHz (62 kHz frequency span window and 6kHz AM filter bandwidth)

03:06 to 03:46 = Airspy HF+ receiving LW Broadcast station with very weak modulation on 162 kHz (48 kHz frequency span window and 6kHz AM filter bandwidth)

03:46 to 04:26 = ColibriNANO receiving LW Broadcast station with very weak modulation on 162 kHz (42 kHz frequency span window and 6kHz AM filter bandwidth)

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04:26 to 04:53 = Airspy HF+ receiving NDB (ID = NIK) on 302 kHz (48 kHz frequency span window and 1.2kHz LSB filter bandwidth)

04:53 to 05:22 = ColibriNANO receiving NDB (ID = NIK) on 302 kHz (43 kHz frequency span window and 1.2kHz LSB filter bandwidth)

05:22 to 05:50 = RSP1A receiving NDB (ID = NIK) on 302 kHz (31 kHz frequency span window and 1.2kHz LSB filter bandwidth)

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05:50 to 06:26 = Airspy HF+ receiving NDB (ID = CF) on 346 kHz (48 kHz frequency span window and 0.73 kHz USB filter bandwidth)

06:26 to 06:51 = ColibriNANO receiving NDB (ID = CF) on 346 kHz (43 kHz frequency span window and 0.73 kHz USB filter bandwidth)

06:51 to 07:28 = RSP1A receiving NDB (ID = CF) on 346 kHz (31 kHz frequency span window and 0.73 kHz USB filter bandwidth)

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07:28 to 08:12 = Airspy HF+ receiving NDB (ID = SZA) on 350 kHz (48 kHz frequency span window and 0.73 kHz USB filter bandwidth)

08:12 to 08:46 = ColibriNANO receiving NDB (ID = SZA) on 350 kHz (43 kHz frequency span window and 0.73 kHz USB filter bandwidth)

08:46 to 09:21 = RSP1A receiving NDB (ID = SZA) on 350 kHz (31 kHz frequency span window and 0.73 kHz USB filter bandwidth)

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09:21 to 09:48 = Airspy HF+ receiving NDB (ID = BIA) on 474 kHz (48 kHz frequency span window and 1.2 kHz LSB filter bandwidth)

09:48 to 10:12 = ColibriNANO receiving NDB (ID = BIA) on 474 kHz (43 kHz frequency span window and 1.2 kHz USB filter bandwidth)

10:12 to 10:37 = RSP1A receiving NDB (ID = BIA) on 474 kHz (43 kHz frequency span window and 1.2 kHz LSB filter bandwidth)

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73,
Mile Kokotov, Z33T

Airspy HF+ SDR vs ColibriNANO SDR on VHF [00:03:11]

On this video I am comparing The New Airspy HF+ SDR-receiver and ColibriNANO SDR on VHF VOLMET signal (124.325 MHz)
Antenna is Vertical Dipole
In the first part of the video, The signal from antenna is connected directly to antenna input of the receivers. At the second part of the video, the -32 dB external attenuator is connected between the antenna and SDR input.

Airspy HF+ vs ColibriNANO Comparison on 3.579 MHz [00:05:29]

In this video I am comparing two high quality SDR Receivers: Airspy HF+ and ColibriNANO. They both have 16 bit Analog-to-Digital Converter. Comparison was made with the same overall conditions.
For example, both receivers was set with equal size spectrum windows, with the same amount of decibels in their scale, and the same high of the spectrum windows.
ColibriNANO has LNA gain slider which was set to maximum SNR.
Airspy HF+, on the other hand, has no LNA gain control.
The SV2HQL/Beacon was chosen as a test signal on 3579.32 kHz (on 80m band)
Antenna is half-wave resonant Dipole (40 meters long) for 80m band.
In the second part of the video I was inserted 27 dB external Attenuator on both receivers. ColibriNANO automatically increased the LNA gain and sets itself to maximum SNR. With this amount of attenuation, The Airspy HF+ noise floor level was at about the same place in spectrum window like ColibriNANO, Unlike in the first part of the video, when no external attenuator was used.
Both SDR-receivers are very good!
Which is better? I leave on you to judge...

RSP1A SDR receiver and SDRuno software — CQ World WIde DX Contest (CW) 2017 [00:05:45]

CQ World Wide DX Contest (CW) receiving in Macedonia with SDRplay RSP1A SDR-receiver and SDRuno software on 80m-Band with full-size half-wave resonant dipole antenna.
Contest conditions are always big challenge to any receiver dynamics. Here you can see only 60 kHz wide frequency spectrum fulfilled with many competitor stations "fighting each other". In addition, there are local radio-station (only 1 km from my place) with huge signal...

Airspy HF+ SDR Receiver with Mini Whip Antenna and External Attenuator [00:01:33]

Airspy HF+ is superb High-Dynamic HF and VHF SDR-receiver and I am impressed with it. In order to minimize possible negative effect on signal path from antenna connector to tuner input, Airspy HF+ has no internal attenuator. Developers takes in account that this SDR-receiver has enough dynamic range that is very difficult to overload it. Actually it is true for most cases. But, if we want to use some type of active antenna (with internal amplification) like Mini-Whip Active Antenna for example, it is good idea to add an external attenuator between antenna and receiver HF-input connector, in order to have opportunity to lower the signal level from the active antenna, and to avoid possible overload issues. In this video I am presented some scenario (receiving MW AM band) when my homemade external step-attenuator is more than welcome! By the way, the external step-attenuator is very easy to made in almost no money. All you need is 9 resistors, three switches and one metal box) I have 5.5 dB switch, 10.5 dB switch and 22 dB switch. It can be set for 8 various combinations: 0, -5.5 dB, -10.5 dB, -16 dB, -22 dB, -27.5 dB, -32.5 dB and -38 dB.
You can see on this video that the AM Broadcast signal from Macedonian Radio on 810 kHz is very strong. The Antenna is about 30 km from my house. It is self standing huge 185 meters high vertical antenna, radiating enormous RF-power, so I have to use my homemade attenuator I mentioned it before.

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