Friday, March 1, 2013

W6NL 40M Moxon Yagi.

3 Band HF Delta Loop.

VHF Portable Dipole.

2 Element Quad Antenna.

70cm Vertical Antenna.

2M 3 Element Yagi.

Another 9 Element VHF Yagi Design.

Simple Quarter Wave Ground Plane.

Voltage Balun.

V or U Quagi.


Dimensions (en mm) 432 MHz 144 MHz

Directeurs: (diamètre 3 mm)
d1 298.5 912.8
d2 296,8 908
... d3 295.3 903.3
d4 293,7 898,5
d5 292,1 893.8
d6 290,5 889

Radiateur 676 2083
(longeur total du fil et diamètre 2 mm)

réflecteur 711 2200
(longeur total du fil et diamètre 2 mm)

Espacements (en mm)

réflecteur et radiateur 178 533
radiateur et d1 133 400
d1 et d2 279 838 !
d2 et d3 149 445
d3 et d4 222 663
d4 et d5 222 663
d5 et d6 222 663

Distance entre baies 1,09 m 3,35 m

Boom 144
Lambourde en bois de 45x25 mm de 430 cm de longueur. Espaceur en bois 45 x 25 mm, 2 x 60 cm de long.

Boom 432
Lambourde en bois 20 x 20 mm de 180 cm de longueur, antenne fixée par l'arrière sur le mât. Espaceur en tube de plexi de 10 mm de diamètre.

La légèreté de cette antenne est idéale pour monter de grandes configurations. K6YNB et WB6RIV ont chacun monté un groupe de 16 quagis (environ 3X3 mètres) et ont été parmi les 15 stations qui ont contacté WA6LET via la lune (EME) lors de la session 432 de novembre 1975. K6YNB recommande un support isolant si on veut monter plusieurs quagis en groupe.

Distance optimale entre antennes: 3,35 m à 144 MHz 1,09 m à 432 MHz

2M Square Dipole Construction.

4 to 1 Balun.

A 9 Element 2M Yagi.

5 Band Hexbeam.

70cm Ruslan Yagi.

A Choke Balun for 160M to 10M.

Another Windom Balun.

Make a 2 kW Windom Balun.

Tuesday, February 26, 2013

Some Interesting GMT Wrist Watches

1. Prometheus Ocean Diver GMT:

2. Hamilton X-Landing:
3. Kentex Skyman:

4. Seiko Spring Drive GMT:

5. Vip Time Italy Men's VP5045BK Magnum GMT Watch:

6. Arnold Men's GMT Timekeeper watch:

7. L.U.C. Pro One GMT Sports Watch from Chopard:

8. Vostok-Europe:

9. Zeno Airplane Diver GMT:

10. Christopher Ward Trident GMT:

11. Steinhart Ocean 1 GMT:

12. Citizen BJ9130:

13. Orient Explorer:

14. Heuer Autavia GMT 900:

15. Breitling for Bentley GMT chronograph:


17. Ingersoll GMT Automatic:

Monday, February 25, 2013

Oldie But Goodie - Yaesu FT-847 HF-VHF-UHF Transceiver.

Hello, it has been a very long spell since I have blogged and written anything here. Just too much going on in my life and little time for any hobbies in general. But I will make a change to that shortly and certainly will have a much more balanced allocation of my time on my hobbies, especially amateur radio and listening to music.
From the photo, many of you will recognize that I am going to blog about the Yaesu FT-847 base transceiver which covers HF, 50 MHz, 144 MHz and 430 MHz. It has general coverage receive and is also an all mode rig.
Not much is written on the FT-847 and I would dare say that this is a often overlooked nice little rig. Some would say that it is a bit on the noisy side - you are right and it is because it is quite a sensitive rig with quite a good front end.

The FT-847 was known as the "Earth Station" according to sales literature and the company's web site. Yaesu introduced the FT-847 in the 1998 as a replacement for the then discontinued FT-736 VHF/UHF Satellite transceiver, with production of the FT-847 ending in 2005. The FT-847 is a multimode transceiver providing coverage of all nine high frequency amateur bands, plus coverage of the 50 MHz, 144 MHz and 430 MHz, with provisions for satellite operations. I would consider this as a sleeper and a keeper. It would be a nice rig for those entering amateur radio and wanting almost everything in one box. This is used by me as a back up rig primarily for HF and 6 meters.

This is the hype by Yaesu:

The FT-847 Earth Station: A masterpiece of high-tech design and packaging know-how!

Utilizing the latest computer-aided design techniques and thousand of "chip" components. Yaesu's engineers have achieved an engineering breakthrough that was only a dream just a few years ago: a full-power transceiver covering HF, 50 MHz, 144 MHz, and 430 MHz bands in a package about 2/3 the size of an average briefcase. Ready for action on SSB, CW, AM, FM, and digital modes, the FT-847's ultra-compact size makes it ideal for serious base stations use, and well as a variety of portable and mobile applications, including Field Day, DX-peditions, VHF/UHF "Rove" operation, and RV installations. And long-term reliability is ensured by the rugged construction, featuring an aluminum die cast chassis which doubles as the power amplifiers’ heat sink.

Unmatched for Satellite Operation
The FT-847 includes cross band full duplex operating, so you can hear your downlink signal while
transmitting (on a different band) on the uplink. The FT-847 is ready for operating on Mode A
(TX: 145 MHz, RX: 29 MHz), Mode B (TX: 435 MHz, RX: 145 MHz), Mode J
(TX: 145 MHz, RX: 435 MHz), or Mode T (TX: 21 MHz, RX: 145 MHz).
Independent display of both the TX and RX frequencies is provided, and twelve dedicated
Satellite VFOs allow you to set the transceiver up for operation on a number of different
Both "Normal" and "Inverted" tracking of the uplink and downlink VFOs is available.
Leading-Edge Receiver Design
Strong enough to survive the rigors of competitive HF operating, yet sensitive enough for stand
alone Moon bounce operation without an external preamplifier, the receiver section of the FT-847
includes a low noise preamplifier, followed by a quad-FET first mixer, which provides outstanding
rejection of intermodulation.
On 430 MHz, the receiver preamplifier is a HEMT device, for extremely low noise. And if you
have tower-mounted preamplifiers you wish to utilize, the FT-847 can be configured to bypass
the internal preamp in favorite of passing +12V through your coax line to power your preamplifier.
Built-in Digital Signal Processing (DSP)
For improved interference rejection, or enhancement of the signal-to-noise ratio, the FT-847
includes a sophisticated audio DSP system. Featuring Auto-Notch, Noise Reduction, and
Bandpass Filter circuits, the DSP is an effective tool for improving receiver performance.
The Bandpass Filter is particularly effective in weak signal work, such as EME (Moon bounce),
as the CW bandwidth may be reduced to a razor-sharp 25 Hz, with a variable center frequency.
This can yield almost 10 dB of signal-to-noise improvement over many commonly-used audio filters.
Shuttle-Jog™ Quick Tuning Aid
First introduced on Yaesu's FT-1000MP transceiver, the Shuttle-Jog™ Tuning Ring provides
rapid frequency change by its unique spring-loaded design. Rotating the Shuttle-Jog™ ring slightly
to the left or right begins manual scanning to lower or higher frequencies, respectively; lean the
ring further, and the scanning rate increases!
High-Contrast Multi-Function Blue Liquid Crystal Display (LCD)
The large blue LCD provides high resolution and contrast for easy viewing from a wide range
of angles and light levels. Dozens of status indicators keep you informed of every aspect of
your FT-847's operating characteristics, with a large Sub-VFO field on the right side being
particularly helpful during satellite operation.        

 The LCD's illumination brightness is adjustable via an 8-level dimmer function.
Okay, here are some details,  the RX frequency coverage is:
  • 100Khz to 76Mhz ( no gaps ) even though the instruction manual and advertising mentions it    has a gap between 30Mhz and 37Mhz.
  • 108Mhz to 174Mhz
  • 410Mhz to 512Mhz
The Selectivity of the FT-847 is as follows:
  • SSB/CW 2.2Khz
  • AM 9Khz
  • AM/N 2.2Khz
  • FM 15Khz
  • FM/N 9Khz
The transmitter in the FT-847 is 100w HF and 6m and 50w on 2m and 70cm. there are 2 fans for cooling the transmit stage (one fan is on all the time and when the ptt is pressed the other fan starts up for better circulation).
Frequency Range Transmit
  • 160 to 6 m, excluding 60 meters (amateur bands only): 100 W (25 W AM carrier)
  • 2 m: 50 W (12.5 W AM carrier)
  • 70 cm: 50 W (12.5 W AM carrier)

Emission Modes:
  • USB, LSB, CW, AM, FM, F1 (9600 bit/s Packet), F2 (1200 bit/s Packet), AFSK

  • The FT-847 is a transceiver designed with satellite operation in mind, with features such as cross band full duplex operation, Normal/Reverse Tracking, CTCSS/DCS Encode and Decode and 0.1 Hz tuning steps.
  • An often overlooked feature of the FT-847 is its four (4) antenna connectors, separating HF, 6 m, 2 m, and 70 cm.

  • HF, VHF, and UHF coverage and General Coverage RX;
  • Provided with DSP Filtering;
  • Dual Watch Capability;
  • 0.1 Hz Tuning cycle;
  • CTCSS and DCS encode and decode;
  • 1200/9600 bit/s Packet Ready;
  • Full Cross Band Duplex Operation.

  • Some You Tube videos of the "Earth Station" in operation:


    I have enjoyed operating this nice little rig and it shall stay within my shack as a keeper, since I  do like the concept of having almost all bands in one box. My advice is if you can find one in fairly good condition, grab it. I owned and operated a FT-736 prior to the FT-847 and I can tell you that I much prefer the FT-847 for overall packaging and performance. The RX on 50MHz is good, only the RX on FT-920 is better.

    The photo shows the rear of the FT-847 and the various connections the transceiver sports:

    Those needing wiring details for the various connections for the FT-847 can refer to the wiring diagram below for reference:


    Sunday, February 20, 2011

    Wouxun KG- UV920R Dual Band Mobile Transceiver.

    Wouxun the Chinese HT manufacturer announced and showcased their first dual band mobile transceiver recently, called the KG - UV920R. It is earmarked for general release around May of 2011 and is said to be the first dual band FM mobile receiver released by a Chinese manufacturer.

    Reports say that it sports 50 watts on VHF and 40 watts on UHF and n fact it sports 3 ham bands on transceive (220MHz - if you are in the USA, not much use for the rest of the world except for RX). Other feature include dual receivers, cross band repeating fuctions, general coverage HF receive with AM and extended RX from 65MHz to 220 MHz - FM band (would cover FM bands overseas and in the US, and analog TV broadcast audio, if that still exists anywhere). RX also on LW and MW in AM. Rumor has it the cost will be in the range of US$140 - 200.