ad: L-HROutlet
ad: l-rl
ad: Subscribe
M0BTZ England flag England

Login is required for additional detail.


Email: Login required to view

Ham Member Lookups: 14718




Maidenhead Locator = IO90GX (Oct 2006 ->  Present).

          ((Previous locations = IO91LC (May '98 - Sept '03)

                                              IO81KQ (Sept '03 - Aug '05)  

                                              IO81PB (Sept '05 - Sept '06)

WAB Square = SU32

          WAB Book Number = 15073.

National Grid Ref = SU 38006 20020

Latitude = 50 deg 58' 42" North

Longitude = 1 deg 27' 36" West

Site = ~40m ASL


To work out your QTF / Beam heading to my station. Try this link :



Hi all,

I am a 34 year old RF engineer located in Romsey, Hampshire, currently employed at Rohde & Schwarz.

I hold the following callsigns :-

  • M0BTZ (Current callsign, since May 1998).
  • 2E0ARB (since Dec 1997. Still used sometimes to work DX on VHF/UHF with QRP!).
  • 2E1FMD (since Sept 1996. Mainly active 70cm FM),

I started the hobby as an SWL from ~1991 whilst still at school, and it has stuck with me ever since!

A big part of the hobby for me is building my own radio equipment for my shack. The radio shack contains a mixture of homebrew and commercial equipment.

The photos show my shack, and some of the homebrew power amplifiers for HF / VHF / UHF.


I enjoy operating on all bands, with a bias towards Low-band DXing in the winter and VHF/UHF DX during the summer.

I tend to operate mainly weak signal modes on the VHF/UHF bands. Currently QRV on 50MHz, 70MHz, 144MHz, 432MHz and 1296 MHz.

I particularly enjoy contesting and DXing and operate both SSB and CW.

I also appear on the 160, 80 and 40m bands during the winter months, and tend to be most active on 40m. 

I frequently participate in VHF/UHF contests and some HF events too.

In the past between 2001 -> 2006, I have activated the University of Surrey club station, G8AHK during VHF/UHF UKAC contests.


Nov 2011 - Present:- Romsey, Hants (IO90GX). 

Shack setup

SWL Setup :-

  • Lowe HF-150 / Lowe HF-225 Receivers.
  • Racal RA6790GM Receiver.
  • Homebrew "K5IRK Progressive Rx" Single conversion superhet ,9MHz IF.
  • Eddystone 840C (1963 vintage)
  • Homemade Medium Wave and Longwave Loop Antenna.

HF Setup :-

1st Station :-

  • TS-950SD (2) + SP-950 + MC-60. 
  • TS-940SAT + SP-940 + MC-50
  • Homebrew HF PA (160 - 10m incl. WARC bands) : Pair of RCA 813's Tubes in grounded grid arrangement, with 2.7kV on the anodes. ~400W o/p. 

  • Homebrew 1kW ATU - W1FB "SPC Transmatch" design with two bigC's and Rollercoaster L + T200-2 toroidal 4:1 balun.

2nd Station :-

  • TS-830S+AT-230 ATU+SP-230+SM-220+VF-240+MC-50 / Shure 444 Mic.

Other Gear :-

  • Icom IC-751A + Shure 444 @ 100W.
  • Also various homebrew HF QRP transceivers for fun.

Current HF antennas (2015):

135ft In-V Doublet with bent ends, Apex at 40ft. Fed with 450 ohm ladderline to the shack.

Also used on 160m by shorting the feeders together and feeding as a Marconi T antenna. I use a remote controlled switchbox and matching coil located at ground level under the antenna feedpoint. The ground system consists of 50+ short radials + earth stakes. 

SWL:- Half-size G5RV in loft space.

50 MHz Setup

  • Icom IC-551
  • 4CX350A Amplifier (Homebrew) or TE Systems 50MHz 150W SSPA 
  • (Homebrew 2 x 4CX250B PA (in 19" rack) - Not yet operational)
  • Homebrew BF981 Preamp.
  • Antenna : Homebrew 3ele DK7ZB short boom yagi.
  • Other antenna options : Switched attic space wire beams. 3ele wire beam (North), 2ele wire beam (East). 5ele F9FT.

70 MHz Setup :-

  • IC-251E+muTek Prime mover with elderly Spectrum 4m transverter TRX4-2I
  • Homebrew 10W PA with an MRF238 device.
  • Homebrew Masthead BF981 Preamp.
  • Homebrew 2 x 4CX250B PA (currently off air) or Homebrew desktop 150W SSPA with MRF-150 (under construction).
  • Antenna : Homebrew 5ele DK7ZB 70MHz Yagi.

144 MHz Setup :-

  • IC-275A / IC-251E+muTek.
  • Homebrew 4CX350A PA (DK1OF design)
  • Mirage 160W SSPA. Run at 100W most of the time. (Backup)
  • Homebrew W1SL : 2 x 4CX350A PA
  • Landwehr GaAsFET Preamp or Homebrew BF981 / MGF1302 Preamps.
  • Antenna = 9ele F9FT,
  • Other options : 11 ele F9FT Yagi, 17ele F9FT, 17ele Cushcraft.

432 MHz Setup :-

  • IC-451E - (Modified) or IC-475 (currently off-air)
  • 100W SSPA
  • Homebrew K2RIW 2 x 4CX250B PA (19" rack) - RF Deck construction in progress.
  • Homebrew Compact 3 x 2C39 70cm PA (DJ9HO design)
  • Homebrew MGF-1302 LNA or SSB Electronics masthead preamp.
  • Current antenna = 19 ele Homebrew DJ9BV design at 11m AGL.
  • Other options : Pair stacked F9FT 21-ele yagis, (old!), Pair homebrew 19 ele DL6WU yagis.

1296 MHz Setup :-

  • IC-251E+muTek.
  • DB6NT transverter (built from kit) + Homebrew Mitsubishi M57762 module PA for 15W o/p.
  • SHF Electronik GaAsFET masthead preamp / Homebrew MGF-1302 Preamp.
  • Homebrew 4 pole Interdigital BPF.
  • Homebrew 2 x 3CX100 Cavity PA (UHF Compendium) & 1.2kV Homebrew PSU (~120W RF output)
  • Current antenna = 48ele DL6WU Yagi Homebrew.
  • Other options: - 26ele DL6WU, homebrew 2 x 37 ele Loop Yagi (~4m boom), Homebrew Stacked Double Quad (DJ9HO style) for /P, Homebrew 3m Dish under construction (to use on EME - one day!), 42 ele homebrew Quad Loop yagi, 4 x 55ele DL6WU yagis (under construction).

2320 MHz Setup (Not QRV yet)

  • IC-251E+muTek.
  • DB6NT transverter. (Recently de-bugged and now working, needs casing and finishing off).
  • Homebrew 4 pole Interdigital BPF.
  • Homebrew 60W SSPA (DC0DA module) + 28V PSU
  • Single 2C39 Cavity PA (UHF Compendium).
  • Homebrew MGF-1302 Preamp.
  • Homebrew 4 x44 ele G3JVL Loop Yagis on 2m boom and H-frame / 4 x Homebrew Stacked DJ9HO Double Quad with combiner for /P / Building DL6WU yagis.
  • Homemade 3m dish under construction (EME)

Not currently QRV :- Need to box up the transverter with Sequencer, Relay and 60W PA.

3410 MHz Setup (Not QRV yet)

  • Homebrewed 70-ele loop-yagi / 1.2m solid Dish.

Collecting bits for a transverter.

Recently received some GaN 40W Power Transistors to have a go at homebrewing a solid state PA for 9cm's!

10 GHz Setup (Not QRV yet)

  • Homebrew WBFM Gun diode transceiver under construction.
  • 60cm solid dish (for /P)
  • 1.2m solid dish (awaiting a feed horn!)
  • Pair homebrew 20dBi Horns for WBFM transceivers. 
  • No transverter yet - I will be looking to become active on 10GHz SSB/CW, once the other bands are sorted out.

Groups & Memberships

  • RSGB Member.
  • ARMMS Microwave Society.
  • UK Microwave Group.
  • UK Six Meter Group (UKSMG), #2929
  • Blacksheep Contest Group (M0BAA) - VHF/UHF Contesting
  • Visiting member - M6T (CQ WW 2017)
  • ex - University of Surrey EARS 
  • Member of the IET (Institution of Engineering and Technology), and working towards CEng.
  • Alumni of University of Surrey, Guildford, Surrey, UK. (Electronic Engineering)
  • Former employee at Roke Manor Research Ltd.
  • University of Surrey Boat Club
  • Current employee at Rohde & Schwarz

Interests within Amateur Radio

  • VHF/UHF DXing
  • Microwave bands
  • VHF/UHF Technical aspects
  • Low band DXing
  • Home Construction.
  • Contesting,
  • Antennas.

Test & Construction bench

The test bench has been relocated away from the main shack to make more operating space. Test gear includes Soldering irons, Oscilloscope, Sig gens, VHF/UHF signal sources, Freq Counter, Homebrew RF dB meter, LC meter, AF Sig gen, Two-tone signal source etc etc...Usually this bench is in a mess!!.

Operating Habits

  • I am a "Search and pounce" type of operator- A habit from my SWLing days!
  • Operate in VHF /UHF contests.
  • Casual HF Low Band DXer during Winter.
  • VHF/UHF DXer during Summer.
  • I operate mainly on SSB, but also some CW.
  • My CW operating is in development, but I can comfortably operate at 15 - 18 wpm when concentrating. If you do hear me on CW, then please have a little patience. My CW operating is not perfect, but I am gradually improving with practice.

QSL Details

You may QSL either via eQSL or direct to my home address with an SAE, or you may QSL via the RSGB Buro or eQSL.

My QSL manager is 2E0VAG.

I am collect cards for HF DXCC and VHF/UHF awards.

I collect Locator Squares / WAB Squares / French Departments / German DOK information and US States.

I particularly value cards from any stations worked on VHF/UHF via long distance Tropo/Sporadic E/MS/Aurora/EME propagation modes, so please do QSL!

Other Interests

Other general interests also include Astronomy, Road Biking, Rowing, Music and HiFi/Audio.

8408999 Last modified: 2017-10-24 22:38:16, 11355 bytes

Login Required

Login is required for additional detail.

You must be logged in to file a report on this page

Please login now...

Public Logbook data is temporarily not available for this user
ad: giga-db
Copyright © 2018 by QRZ.COM
Sat Jan 20 01:27:53 2018 UTC
CPU: 0.047 sec 67251 bytes mp