Archive for the VHF Category

10G DXCC+ODX = 1100+ km !!

Posted in VHF on 30 August 2017 by iw0ffk

In the latest days very good conditions of ducting over the Mediterranean Sea with huge signals from Spain in VHF & Up bands.


Silvano I0LVA has opened the path, then many OM have fixed skeds with Vicente EA5YB.

I did it in the afternoon (after three attempts at 1 hour interval).



Here the working conditions of Vicente EA5YB


Summer works 2017

Posted in Electronics, VHF on 30 August 2017 by iw0ffk

Usually I spent part of my August holidays to do some work that can’t be done during the working days. In the latest months I prepared some parts to be installed on the rooftop. This year has been focused to 23 and 3cm bands.
Stuff list:

The GPSDO has been placed near the antennas and supplied 24/24/365 with POE shared with a WiFi Access Point. It provides the reference signal for the 9936 MHz oscillator and for the ADF4153 inside the LZ5HB’s transverter.


With Pino IK0SMG we measured the DF9NP’s oscillator that works well and has a good phase noise.

Then we measured the 10G power amplifier and after some work the maximum gain of 8+ dB has been centered to 10.368 MHz. My driving power is little more than 30 dBm, the resulting power to the feed is now 37 dBm.


The 23cm amplifier uses a MRF186 device that has a gain of 11 dB @ 960 MHz, when used at 1300 MHz the gain drops around 9-10 dB. The RF power of the transverter is 2 Watts, so the power in antenna is something less than 20 Watts. Not so much but it’s better than before. The transverter, the amplifier and the RX filter (necessary) have been placed in an aluminum box on the mast near the antenna.


2017 VUSHF season in JN61

Posted in VHF with tags , , , , , on 17 June 2017 by iw0ffk

This Spring/Summer I have two new bands to play with: 1296 MHz and 10 GHz.

23cm setup for now is a single 55 elements F9FT and a transverter made by LZ5HP

This transverter has a power of 2 Watts and it’s placed on the boom of the Yagi, I’m building a 100 Watts power amplifier based on the project of K5TRA (pcb by IK0EQJ, tnx!). I would place it on top of the mast in the same box of the xverter. It’s still WIP.


Anyway two Watts are enough for a 23cm AirScatter QSO if on the other side there is someone with big ears like IK3GHY.

With Giorgio IK3GHY we had also a nice Rain Scatter QSO on 10 GHz, the first part of this video was recorded by IK3GHY. It’s interesting to note the effect of the scatter on the demodulated telegraphy tone, the single frequency generated is spread in a good part of the rx filter producing a Morse code modulated noise, funny to hear and similar to the Aurora effect on the VHF bands.

The same day, but beaming to a different scatter point, SSB QSO with I6XCK. The effect on the Cesare’s voice is the same as CW.

On 10 GHz a remarkable QSO and my personal ODX was with ED4SHF/6 in JN10wm, QRB 750 km. The QSO has been recorded by Silvano I0LVA.

144 MHz ES worked a new country, 5B4VL in KM64 (Cyprus) and a new square KO37 thanks to YL2OK in Latvia.

On 6m TEP not a single QSO around the equinox days but worked several ES openings mainly toward Asia with good signals from Korea, China, Philippines and two new countries E3 (Eritrea) DXCC #198 and C6 (Bahamas) DXCC #199.

DS4EOI Corea in PM47

C6ATA Bahamas in FL15
The audio file has been recorded by C6ATA

This is the first year of heavy use of the JT65 on 6m for terrestrial QSOs. I think it’s a great tool to promptly detect the openings but it’s too slow to make contacts and several times the dx station is workable only for few tens of seconds, often enough for CW.
The gold rule is, if you hear the JT65 tones on the headphones, you’re wasting time and propagation.


IC-7300: more antenna connectors with Arduino!

Posted in Electronics, VHF with tags , , , , on 12 April 2017 by iw0ffk

I wish to use the IC-7300 on all my bands, but the problem with this rig it’s always the same: too much frequencies for a single antenna connector and I don’t want to swap the coax all the time. On the market there are manual coax switches, but there are not so handy for a remote use…and this one is cheaper.

So, in a rainy Sunday I have built this 1×3 antenna switch controlled by Arduino. I already done something similar in 2009 with a PIC, this time I choose Arduino because it does not need of any programmer to write the code on it, just the USB cable. In the past several OMs have sent their empty PICs to me and I have sent them back programmed. A single project usually don’t worth the cost of a PIC programmer.

This should stops the foot traffic, everyone can load the code in the IDE and write it into the chip with a click.

This 1×3 ant switch is made with few generic electronic components around a “Nano” (ATMEGA328), but the code can be adapted to any ucontroller. It is powered by the transceiver (pins 2 and 8 of the ACC connector) and reads the frequency from the “Remote” jack. It can be fixed directly on the antenna’s connector by using a male-male PL259 adapter. Into the RF box there are three Finder relays model with gold plated contacts. The values of attenuation and isolation between the ports are good:

28 MHz – att. 0.11 dB – isol. 40 dB
50 MHz – att. 0.11 dB – isol.35 dB
70 MHz – att. 0.12 dB – isol. 32 dB

The microcontroller and the rest of the parts are in a separate box to avoid interferences.

The IC-7300’s range of frequency 30-74800 kHz is divided in 24 sub-bands, every sub-band can have associated one of the three antennas output. The right antenna is selected automatically. Simply it remembers the last selection.


Ask me the source code to my address. does not permits to upload zip files.

Remote station update

Posted in VHF on 5 February 2017 by iw0ffk

A brief report of the changes in the remote station system.

The relays to control the mains of the whole station and the PSU of the linear amplifier have been replaced with solid state relay like this one:


The relays are controlled via WiFi by an ESP8266, I added a small display just to monitor the temperature of the amplifier and to read the IP address.


Some update has been made also on the web interface:

10GHz update + first “DX”

Posted in VHF on 15 December 2016 by iw0ffk

The annoying difference of frequency between TX and RX has been solved by stabilizing the supply of the local oscillator with a DC-DC converter. There was a small voltage drop due to the high current of the TX-RX coaxial relays (600 mA…)

First test with Silvano I0LVA, QRB about 50 km easily worked in SSB also with minimum power (50mW).

The surprise was during the Vecchiacchi Memorial Day of 4 December, Cesare I6XCK in JN63QO QRB  of about 215 km with the mountains in the middle, worked in CW directly, no RS. I received I6XCK with a clear 529 for the whole duration of the sked, but I had to wait a bit and repeat the report/number/locator several times to complete the QSO probably due to about 10dB of difference of RF pwr. I think a PA is needed…


I’m always free for any reasonable sked on 3cm.

10 GHz, state of play

Posted in VHF with tags on 17 November 2016 by iw0ffk

Over the past few months I acquired some parts needed to complete the Eyal Gal transverter. I had to build the filter placed just after the TX mixer that has been done by using 15mm pipe caps.  The local oscillator feeds the two mixers (TX and RX) with a 6dB directional coupler and a buffer amplifier.

The sequencer has been made with a simple circuit (IK5ZWU) and adapted to the Eyal Gal. The signal “TX Inhibit” is used to avoid any RF coming from the FT-817 during the changeover. In RX the Eyal Gal’s amplifier is disabled and his gain is set to the minimum.



The “ALC” level sets the gain of the output amplifier. With the FT817 set to maximum output power on 432 MHz, about 4 Watts (total input attenuation is 37dB), the trimmer R11 is regulated to obtain little more than 1 Watt on 10G. By lowering the FT817 driving power to 2W, 1W, 500mW, the 10G power will be lowered to 600, 250 and 50 mW

Up to now I had only one SSB QSO, with IK0EQJ, and I discovered an annoying difference of some kHz between the RX and TX frequency. Probably I have to separate the power supply of the local oscillator from the transverter.