COMMERCIAL & AMATEUR RADIO

WORKSHOP SALE

EMAIL G4ICD@BTINTERNET.COM


BALUNS/CHOKES/UN-UNs


1/1 CHOKES/LINE ISOLATORS:

Mini & Medium format 1/1 chokes, in line isolators, noise killers (in some cases), BNC or SO239 or “N” type, 25/50/100/250/400/1000 watt pep, all PTFE coax wound cores using Ni/Zn or Mn versions for different solutions. NO IRON POWDER CORES USED. TO CLEAR FROM £20.00 EA

SPECIAL 1/1 CHOKE/LINE ISOLATOR:

£35!!!

A top quality 1/1 unit with the RIGHT core and the RIGHT high quality coaxial cable. Using the FAIR-RITE FT240-31 Mn core #2631803802 wound with PTFE semi-rigid RG402 coax which uses a solid braid and it does not get better than this. Tested on air with 1kw key down CW. The basic unit is fitted with certified PTFE sockets not cheap Chinese half plastic versions, “N” types are optional. Superb returned RF attenuation from 2 > 50MHz (approx 35db) and also good for noise reduction on the feedline where applicable. Resin potted for stability in UV protected lapped lid enclosure with internal rubber seal and suitable for indoor or outdoor use. ONLY £35. Also optional RG142 double screened silver plated PTFE coax available, see further down page.

FT240-31 Mn core below with RG142 double silver plated screened PTFE coax

ONLY £40

PTFE SO239 sockets, resin potted and the finest quality and price, last few left.

£40.00!!


4/1 UNITS:

4/1 VOLTAGE VERSIONS:

Mini 4/1 Baluns 2 > 30MHz RL = 30db, Ni/Zn/F14 core wound with PTFE wire in PTFE sleeve, top commercial grade, 125 watt pep (400w versions made to order but larger enclosure), resin potted. Guaranteed the best available, BNC/SO239: £20.00

4/1 CURRENT VERSIONS:

Top commercial quality 4/1 Current baluns. Multi-core, up to 6 cores used depending on power requirements, TRUE current units not fake single core versions, UV/IP protected enclosure, Marine M4 quality stainless steel line support rings, also provided for mounting and coax cable support. Dual special custom made cores wound with silver plated PTFE wire. Genuine PTFE SO239 socket, resin potted with condensation vent. Dual ceramic insulators for lines fitted with solder tags and wing nuts. Superb sweep of 2 > 30MHz. Various power ratings for 100/125/250/400/1000 watts pep ICAS prices from £20, optional tunable chokes on each line output to give a perfect balance (see further down this page). Terminated 200 ohm sweep 0 > 30MHz: 15MHz @ RL 38db = (VSWR 1.03/1). Ideal for loops, Doublets and OSCD antennas.  Compare this quality and price to the MFJ versions.

Which one would you buy?

Left: MFJ-911 300w ?? FT140-43 x 2 100w: Special RF Comms cores  2 x Ni/ZN/F14 250w: 4 x Special RF Comms 400w

RF Comms builds sweep below

Return loss = 38db terminated at 200 ohms as pictured below using custom made cores and silver plated PTFE wire

The return loss on this unit is just superb: The REAL solution for Doublets, loops and OSCD antennas

400w pep version 4 cores: ceramic insulators: resin potted:

1 and 2 kw multi core commercial 4/1 Guanella current baluns also available in 2 core and 4 core FT240 format

True Guanella Current baluns, get the current to the wire! and not the voltage

4 Stack 4/1 True Current balun

100w £20.00

125w £35.00

250w £40.00

400w £45.00

1000w £65.00

1500w £85.00

4/1 UN/UN VERSIONS:

Mini 4/1 un/un units 2 > 30MHz RL = -30db, Ni/Zn/F14 core wound with PTFE wire in PTFE sleeve, top commercial grade, PTFE SO239 or BNC socket, 125 watt pep (400w versions made to order but larger enclosure), resin potted, counterpoise/ground post fitted. Guaranteed the best available.

4/1 un/un superb 200 ohm terminated sweep offering -30db RL @ 2 > 30MHz, guaranteed the best commercial unit on the market

£20.00 Each

RL value: 30db over 2 to 30MHz centered on 15MHz +/- 15MHz

CONTACT

CLICK THE WORD “CONTACT” ABOVE


9/1 UN/UN UNITS:

Mini 9/1 un/un units 2 > 30MHz, Custom made Ni/Zn/F14 core PTFE wire wound, top quality, counterpoise connector fitted, BNC or SO239 sockets, non resin or resin potted, weatherproofed, cases are black or grey, main line and counterpoise ss strain reliefs, 100w versions, superb Rhombic terminators or just use as a multiband antenna (ATU required). 

£20.00 ea

High power 9/1 un/un units, Mil spec PTFE silver plated wire wound on a large Amidon core, lockable insulators pos/neg, PTFE SO239, 400w pep ICAS, marine stainless line support eyes plus mounting plus coax (ATU required), the best quality available and the last few left. 

£35.00 OR 2 FOR £55.00


49/1 UN/UN MULTI-BAND ANTENNA UNITS:

FOR AMATEUR RADIO USERS:

LOTS OF SPECIAL OFFERS

THE PERFECT SOLUTION FOR QRP (LOW POWER) OPERATION & UP TO 1KW.

4 resonant (Bands 7/14/21/28MHz) frequencies from one piece of wire or use a half-wave length of wire for a spot frequency between 2 and 30MHz and only £12 for a QRP matching unit! SUPER LOW COST AND SIMPLE TO INSTALL

READ THE PDF BELOW! CLICK THE LINK

The-End-Fed-Half-Wave-Antenna

Note the comments of recommendations (G Whip Antennas G4ICD designers of the first LC resonant HWEFD in 2007 and read the reports in Eham )

KEY POINTS

1) DO NOT USE 1/1 CHOKES AT THE ANTENNA FEEDPOINT: WHY? Because ALL un/un units whether it be 4/1, 6/1, 5/1, 9/1 49/1 etc have the last winding connected to the earth of the RF socket, so the coax braid is used as the hidden counterpoise. If you experience RF in the shack then fit a quality 1/1 line isolator at the radio feed-point. Type “31” mix wound with RG142 is the best solution, but even at 400w I have never seen RF return problems.

2: For 7/14/21/28MHz we suggest 12 > 15 mtrs of coax and 20 mtrs of line, for 3.5/7/14/21/28MHz we suggest 20 mtrs of coax and 40 mtrs of line, remember that the unit is an un/un and if you change the feeder/coax the antenna resonance may move.

49/1 EFHW UN/UN 1KW UNITS:

WHEN THEY ARE GONE THERE WILL BE NO MORE SO GRAB ONE FOR YOUR NEW UK 1KW LICENCE! 

Low profile 1000 watt pep ICAS unit using Genuine Amidon (Fair-rite) dual FT240-43 cores, 30kv 100pf  5% capacitor not 3kv like most units available, double bus grounded PFTE SO239 or “N” type socket, 3 x Marine M4 stainless steel rings for mounting (left), line support (right)  and coax strain relief (front), and of course resin potted in a quality Weiss UV enclosure with rubber gasket lid and condensation vent. Under half the price of the MFJ unit and REAL quality!!! OPTION EXTRAS of GROUND POST EARTHING BOLT and ceramic insulator. POA

ONLY £50 EACH OR 2 FOR £75 COLLECTED

400 watt single core version below.

Fitted with Genuine Amidon Fair-rite FT240-43 single core with either 14 SWG or Mil grade quality silver plated PTFE wire and 30kv 100pf 5% +/-  quality capacitor.

CRAZY PRICE WHILST STOCKS LAST

£30.00 see picture below

CONTACT

ONLY £30.00!!

The 49/1 un/un: NO TUNER REQUIRED: A superb single frequency or multi-band unit, A RESONANT End Fed Halfwave antenna un/un offering harmonics from the base frequency, just add your wire, ideal for small gardens, low or high power units available, used by commercial HF users Worldwide with staggering in Country results. Our test unit has been demonstrated many times to Commercial and Amateur visitors showing just how good these units can perform as they offer RESONANCE. With just 10 watts of ssb (Icom IC-705 and TX 599) over 12000 kms has been worked on the higher bands via F2 (21/28MHz) subject to Solar conditions (A & K Index figures). Reunion Island and other islands in the Indian Ocean are worked on a regular basis from here in the UK and that is 8000 kms on 28MHz. Our units are resin potted and UV protected, 100w versions use custom made cores (Ni/Zn/F14) that offers a VERY low insertion loss of 0.3db, this is achieved by using a special core mix of Ni/Zn/F14 material and our special resin which changes the L/C ratio just enough to offer that little more return loss (RL vs VSWR), 2 units measured back to back = 0.6 db on certified calibrated equipment, available in BNC/SO239 or “N” type sockets. 25/50/100/200 and 400/1000 (dual core) watts pep versions from £10 to £50

A superb resonant antenna sweep and you can get 6 bands out of it

EMAIL FOR COLLECTION DETAILS

CONTACT

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50 Watt Mini version £15: 2 for £25 collected

100 Watt Mini version £20: 2 for £30 collected

250 Watt SPECIAL dual core version £25: 2 for £40 collected

400 Watt version £30: 2 for £50 collected

1000 Watt Dual Core version £50: 2 for £75 collected


CONTACT

CLICK THE WORD “CONTACT” ABOVE FOR SALES


50MHz RESONANT END FED

£30.00 with kevlar line

Designed by G4ICD many years ago for VHF commercial applications (30 > 75MHz) this version is a “banded” L/C half-wave matching unit with no insertion loss. It provides a superb match with just a Half-wave radiator made of kevlar or a telescopic antenna. Small footprint for qrp or larger versions for high power it is the ideal solution to get on the band and work lots of exotic dx on VHF especially during the Summer months of Sporadic “E”.

Super match/sweep: 26/5/2023: Wkd 18 Eu Countries on ssb in 2023 (“ES” opening)

CONTACT

CLICK THE WORD “CONTACT” ABOVE FOR UK SALES


100 MTR DRUMS OF RS PTFE WIRE: MOD NOS

SILVER PLATED MULTI-STRAND 22 AWG 19/034

IDEAL FOR AUDIOPHILES AND RF WORK

TYPE UL1213: PURPLE: SUPERB FOR HF BALUNS/TRANSFORMERS 400W PEAK

EX MOD £50 PER DRUM (RS RETAIL £120.00)


1000 MTR DRUMS OF KEVLAR 

FREE KEVLAR OR LED VSWR METER ON

SALES OVER £100 WITH ABOVE TRANSFORMERS.

CASH ON COLLECTION ONLY

(Max length 20 Mtrs)

FULL RACAL SPEC KEVLAR WIRE, UK MADE, LIGHTWEIGHT BUT STRONG!  PUT IT UP AND IT STAYS UP!

Fits nicely onto the 10 Bander portable antenna to give you visual information of

VSWR of the HF/VHF bands (up to 50MHz)

Modified antenna will have 7MHz coil added plus dual cut 1/4 wave radial package to give 40/20/17/15/12/10/6/4/2/70cms


1/1 DIPOLE CENTRE CHOKES TO CLEAR

250W PEP,  PTFE SO239 or BNC socket (200w pep), stainless steel support eyes for lines and coax, ceramic insulators with solder tags, resin potted

£20.00 ea CASH ON COLLECTION


MIL SPEC DIPOLE CENTRES

Top quality new Mil spec dipole centres, SO239 socket, supplied with stainless steel strain reliefs for lines and coax, 18 units left, limited to 1 per person.

Normally £25 Bargain £10 each


MOBILE LOUDSPEAKERS

New quality extension speakers, lead, 3.5mm jack, mounting bracket and fixings

BARGAIN £10 CASH ON COLLECTION


QRP ANTENNA OR RX ANTENNA:

HF TO UHF

A switchable FX1588 toroid for HF to UHF with coax/plug to transceiver or receiver, fitted with a BNC telescopic antenna and +/- connectors for external wires, tested at 10w pep, these units were used by ???? to monitor certain frequencies covertly.

LAST ONE ONLY £15.00 CASH ON COLLECTION


MORSE BITS

New Micro T20 Morse Tutor £20:

Other pictured items no longer available


SWR METERS

SX200: 1.8 TO 160MHz: 400W AV/PEP: £40.00

AV-1000: 1.8 TO 160MHz 400W AV/PEP: 430 TO 450MHz  & 1240 TO 1300MHz AV/PEP (200W ON 23 CMS) Multi sensors, SO239 for HF/VHF and  “N” type for 70/23cms:    £60.00

RX20 Revex: 1.8 TO 200MHz 30/300w scales: £30.00


ODD BITS AND BOBS

Sennheiser HD206 new boxed headphones with 3.5 to 6.5mm jack adaptor, long leads, tested,

superb performance, Amazon price £33 Bargain £10 collected


LED PROJECTOR & NEW SCREEN

Bought a few years ago whilst on business in Singapore this mini LED projector is superb: Made by Innovative it includes inputs for HDMI/VGA/AV/USB/and Micro mini sd card (included with one of my training videos for Hilomast mast servicing at the NAB Broadcast Show in Las Vegas). The unit has only been used for about 20 presentations around Asia for RF education etc. Comes with soft case and power supply plus remote control and is in mint condition. I have the receipt when bought at Sim Lim Tower Singapore for $S1599 which was £800. FREE new 50″ screen that folds down to a 3″ square pack in a bag. 

BARGAIN  FOR £80.00


TELESCOPIC ANTENNAS

We have a tray full of HF/VHF/UHF antennas, BNC/SO239 and 3/8 UNF fittings.

2 or 3 walkabout tapable /p multi-banders from £3 each

 COLLECTION ONLY