LATEST NEWS

UPDATE 22/6/2021:

 CHECK STOCK AS MANY ITEMS NOW SOLD

A mega offer on these 3 units below, 49/1,  3 to 30MHz, PTFE SO239 or BNC, stainless fittings, resin potted, top quality, comes with 22 mtrs of green stealth wire, end insulator, ultra lightweight for base or portable use, installation sheet, tested and ready to go. Built to commercial industry standards. CHECK STOCK AS MANY ITEMS NOW ORDERED/SOLD

49/1 25w PEP, cased dual core units built £15 ea inc 22 mtrs wire/spool and end insulator.

49/1 Amidon FT-140 core 50w PEP cased built units. £20 ea inc 22 mtrs wire/spool and end insulator.

49/1 F14 Special larger core than FT-140: 100w PEP BNC or SO239 units  £25 ea inc 22 mtrs wire/spool and end insulator.

The 22 mtrs of wire will give you 40/20/15/10 or double the length for 80/40/20/15/10. Single frequencies or multi-band

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50 or 70MHz RESONANT END FED HALF WAVE ANTENNAS 

USING OUR COMMERCIAL 30 TO 80MHz UNITS

VHF 40/50/60/70 MHz sweeps using L/C matching units. Zero insertion loss.

40/50/60/70 MHz Sweeps using L/C matching units. Zero insertion loss.

40/50/60/70 MHz Sweeps using L/C matching units. Zero insertion loss.

3 Commercial Band Versions modified for 50 or 70MHz

50 & 70 MHz has gone crazy with single, multi and cordal hop Sporadic “E”. From the UK Mongolia has been worked, G4RRA wkd J6 in the Caribbean. Africa, USA, VE, EA8, CU2/3, Mali, 6W1, FY5, YV, PZ4, and the whole of Europe including C31 and 3A2 has also been worked and its going to get better so grab a 50 or 70 MHz resonant end fed and get on the bands.

GREAT PRICE ONLY £32.00 (Only 50MHz versions left at present 22/6/2021)

Above: Based on our commercial range of resonant end fed VHF antennas (30 > 80MHz in 3 groups) this is the mid band version which with it’s half wave length of Kevlar commercial wire is resonated on 50 or 70 MHz with component changes, it is not resonant on 50 and 70 MHz as a single unit. SO239 socket (other sockets available BNC/”N”), stainless hardware including strain relief line thimble. 4mm back mounting stainless hook. Power rating is 100w pep (250 and 500 watt “N” type commercial versions available POA) IP rated enclosure with rubber lid seal and resin potted with condensation vent. End insulator supplied with instructions for optimum installation are included.

Above: Super sweep @ 50 ohms @ 1.05/1 @ 50.120MHz +/- 500KHz @ 1.2/1.

Below: 50 MHz non kevlar version.

ATC (MOD) mid band commercial version, 9 spare units set up on 50.110MHz, 100 watts pep or 25 w FT8/FM, PTFE SO239 socket, line support strain relief, coax support and stainless steel rear mounting hook, resin potted with condensation vent brass ferrule, approx 3 mtr line with end insulator which is adjustable for your installation, instructions supplied.

BARGAIN £25 + UK p/p 

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FREE 45D 4.5MM MIL KEVLAR WIRE: END OF DRUMS: DRESSED 10 TO 14 MTR LENGTHS WITH ANY 49/1 UNIT PURCHASED. ALL NOW TAKEN BUT MORE TO COME AS WE GET NEAR REEL ENDS

This is a bargain not to be missed as the 45D Kevlar is commercial grade heavy duty but extremely flexible, retails at £4++++ a mtr some commercial dealers charge much more!, dressed and heat shrinked on one end and ready to go. 10 to 14 mtr lengths FREE with any 49/1 units purchased subject to availability.

NEW 3 CORE AMIDON FT240-52 “K” WINDING TESTS

More new interesting tests on the tri core winding of the 49/1 versus conventional winding, the primary does not need to be twisted and has PTFE sleeving on both primary and secondary windings, this produces an even better match.

MATERIAL STOCKS STILL GOOD

Material stocks are still good despite EU/ASIA having problems with supplies.

AMIDON/FAIR-RITE CURRENT CORE LEVELS: 14/6/21:

FT240-52 – 862 items (2 cased tri core units built and 10 more wip)

FT240-43 – 840 items (114 cased single/dual units built in either grey or black enclosures)

FT240-61 – 906 items

FT240-31  765  items

Orders welcome for custom builds using the above items

NEW 49/1 LOW POWER UNITS FROM £15

Over 250 completed mini units in stock: 10/25/50/100/125 watt: SMA/Mini BNC/BNC/SO239/”N” Type sockets, resin potted. Quantity discounts available subject to MOQ (10)

1/1 Chokes 10w to 5Kw. SMA/Mini BNC/BNC/SO239/”N” Type

NEW 49/1 HIGH POWER UNITS FROM £35 FREE KEVLAR END OF DRUMS

During the end of 2020 we purchased a mega amount of stock from a liquidating company near Portsmouth. Amongst the stock were thousands of ferrites including genuine Fair-Rite/Amidon FT240 /43/52/61/31 variants and FT140/114-43 and others all Ni/Zn, all are certified COO (Country Of Origin) China at their new plant, we have tried to sell them off in 100 lot batches but no takers so due to so many requests and comments of our commercial quality products we have decided to produce higher power 1/1 chokes and high power versions of the 49/1 transformers at an economical price.

Above: Over 150 units available in single, dual or tri core (500/1000/1500 watt) in grey or black enclosures

Below: We now have black enclosure versions of the single Fair-Rite Amidon core FT240-43 500w and dual Amidon core FT240-43 1000w units in stock and as of 4/5/21 we also have the Amidon FT240-52 3 core 1500w in the same enclosure and that took some engineering skills getting the 3 cores in the enclosure.

NEW BLACK ENCLOSURES

Below: The new 3 core FT240-52 versions. Heavy duty M6 rear mount and M6 line strain relief, PTFE SO239 or PTFE “N” socket, 1500w pep ICAS. Weight approx 750 grams. In stock @ £58.00 (PTFE SO239) or £63 for PTFE “N” Type socket. Resin potted.

High power 49/1 transformers: PTFE SO239 or “N” Type sockets available, all resin potted. Prices from £35 (no resin)

Stacks of 3 stacked FT240-52 units ready to wind

We have over 4200 genuine Fair-Rite Products (Amidon) including: FT114-43: FT140-43: FT240-43: FT240-52: FT240-61: FT240-31 which will be used for matching units and chokes for both commercial and Amateur Radio use.

Above: Single and Dual Amidon FT240-43 49/1 units

1 x Amidon FT240-43 Core 500w ssb/125w FT8 (£35 or £38 with resin)

2 x Amidon FT240-43 Cores 1000w ssb/250w FT8 (£45 or with resin £48)

Genuine Fair-rite/Amidon FT240-52 “K” Versions 3 stack

3 x Amidon FT240-52 cores 1500w ssb/400w FT8 (£55 or with resin £58)

Greenpar/Radial PTFE “N” type sockets £5 extra

BELOW: SPECIAL 3 stack Genuine Amidon FT240-52-“K” resin potted, ground lug, all stainless fittings, condensation vent, heavy duty Hammond IP rated thick wall enclosure, 1500w ssb. £68.00 3 UNITS READY ON THE SHELF

Above/Below: 3 x Amidon FT240-52 cores stacked in a heavy duty ruggedised Hammond RP1175 IP rated gasket fitted enclosure, stainless steel M6 back mounting eye, stainless steel line strain relief, 1500w ssb/400w FT8. PTFE “N” type socket. £68.00

7MHz 1.2/1: 14MHz 1.13/1: 21MHz 1.25/1: 28MHz 1.18/1: Or any spot frequency 1.5/1 MAX 2 > 30MHz

COMMERCIAL GRADE KEVLAR WIRE

4.5mm (45D) dia heavy duty Kevlar commercial grade transmission line, 250 kg breaking strain, 5kw++ pep power handling, heavy duty plaited copper braid with a lower resistance of 28D or 32D versions, approx 500 kevlar strands, this is not ham radio shop quality it is for commercial HF arrays, available for any buyers Commercial or Amateur radio users.

There’s lots of variants of Kevlar wire around, some from Asia and the Eu but the best is British and always has been and always will be. 3 Companies in the UK manufacture various Kevlar wire sizes and have been doing so and supplying the MOD for over 50 years in the following dimensions: 20D (2mm), 28D (2.8mm) and 32D (3.2mm). We have documentation and reports of tests and requirements from Racal (now Cobham Antennas) MOD supplier Joyce Lobel and Plessey. The documentation includes the make up of the wire and it’s tensile strength etc. In the picture above on the left is the 2mm version, next is the 2.8mm version (which is a common version found in Ham Radio shops), next is the 3.2mm and then there is a monster 4.5mm custom made special with over 500 fine kevlar strands which is much more than the 64 strands found in the 2.8mm version, the 4.5mm version has a breaking strain of over 250 kgs which is 3 times the 2.8mm version, just to show how big it really is next to it on the right is standard RG58 coax, put it up and it stays up for life. The first 3 versions look like toys compared to the 4.5mm version. The resistive nature of the 4.5mm version is much lower due to the heavier weave of the plaited copper line. Several thousand mtrs available. Drop us an email. MOQ (Minimum Order Quantity 20 mtrs)

Manufactured by Ormiston of London the Kevlar wire specialists for many years and suppliers to Mil antenna manufacturers. MOQ (Minimum Order Quantity 20 mtrs and only available from us at a bargain price)

Terminating/Dressing Kevlar Wire: Dressing Kevlar wire is very simple, when soldering you DO NOT chop out the kevlar strands like some people suggest, you simply use a good hot 100-150 watt soldering iron and you end up with a perfect termination as below, buy it and we will even dress it for you.

1/1 CHOKES

Top of the range: RG142 double screened silver plated PTFE coax on the mega Ni/Zn core fitted with PTFE 7/16 sockets.

5kw version PTFE 7/16 EIA sockets fitted and resin potted. Last one at half price at £75.00

Below: Top of the range heavy duty Ni/Zn core 3 times the size of FT240 cores wound with Mil Spec’ RG142 double screened silver plated braid PTFE coax, fitted with 7/16″ PTFE sockets and double earth bonded. Will run at a max of 5kw ssb and has superb 8k zMag, supplied with 4 x 7/16 adaptors to “N” type plug or socket and will run at 2kw.

PTFE 7/16 connectors fitted

Below: Our super Mega core at the side of an FT240-43

Various models and sockets available, SO239/BNC and “N” type, RG142 (5kw) of which we have several 100 mtr drums, RG303 (PTFE Coax 2kw) or RG316 (PTFE coax 400w) Prices from £25

MORE NEW CORES MADE

A MAJOR BREAKTHROUGH IN PERFORMANCE AND COST

500 Custom made Ni/Zn F14 material cores have recently arrived, tests indicate a fantastic test sweep for 50 watt spot frequency or resonant multi frequency end fed antennas 3 > 30MHz incorporating Hybrid variants of the 49/1…………..these are now available as a complete resin potted unit BNC, “N” or SO239, “a major break through in reducing costs and getting better performance with just 0.5db insertion loss (0.3 db after further tests)”. Samples were made and resin potted with fantastic results. Samples are available for commercial users in either a 49/1 for spot frequencies or 2 Hybrid versions for 3 to 18MHz coverage.

Using these new cores means that the HF spectrum can be easily modified for commercial users requirements

*New Commercial Day-Night Units

Need Kevlar Wire? Ormiston Wire Company

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COMMERCIAL NEWS:

New Universal Antenna Vehicle Mount

A mobile mounting system that will fit ANY vehicle and hold ANY antenna without drilling holes. Innovative dual suckers capable of supporting any HF antenna, fitted with bracketry to accept any HF or VHF antenna, the bracket can be adjusted in a vertical or horizontal plane for roof mounting or side panel mounting. Can be placed on any vehicle flat surface including steel, fibre glass and alloy in seconds. Earth bonding strap and coaxial feeder included. Many antenna socket options available including 3/8″, SO239, BNC etc.

Single or Multi Frequency Matching units for HF:

NO TUNER REQUIRED

Our NEW ultra low cost high quality COMMERCIAL matching units consist of single, dual, tri and quad cores, some of the cores are custom made and all wound with PTFE DEF STD 210 wire, matching/insertion loss is very low at around 0.5 db MAX. The cores are fitted into a UV protected enclosure that is resin potted, the enclosures below are custom made and IP68 rated. We offer SO239/BNC/TNC or “N” type sockets. Power levels up to a maximum of 125 watts pep (this is what the commercial radios are capable of) although we do manufacture higher power levels for special orders. Top quality, low cost and no compromises, stainless steel line and mounting supports. Heavy duty lightweight enclosures and heavy duty high power units, we can manufacture single frequencies, or multi frequencies or ranges between 3 to 18MHz to suit your requirements for day/nightime operations. MOQ POA.

New IP68 rated UV protected enclosures with stainless steel fittings

Commercial sales only: MOQ

New IP68 rated UV protected enclosures with stainless steel fittings

A large range of power options are now available using single, dual and multi core custom made ferrites as below, these units have been extensively tested for many hours using ALE, DATA and SSB transmissions.

New mix cores Ni/Zn F14 types

NEW DAY – NIGHT UNITS

NEW DEVELOPMENT: Single or multi core (depending on power requirement) silver plated PTFE wound hybrid matching units, 2 models for day or night time operation, uses single 25 mtr line with near flat response over 7 to 18MHz and 3 to 14MHz @ MAX 0.5db insertion loss, commercial quality, SO239/BNC/”N” sockets, IP68 resin potted enclosure, 50/125/200/400 watt pep versions, stainless steel back support hook, stainless steel line strain relief, spring loaded connector. These are the 1st batch of samples in the IP68 rated enclosures made for overseas commercial users. Models HFD (7 to 18MHz) and HFN (3 to 14MHz). Commercial sales only: NO TUNER REQUIRED, LOW COST, MOQ

ABOVE: New hybrid multi core unit offering superb matching for day/night operation on commercial frequencies. 0.5db loss @ 3 > 14MHz and 7 > 18MHz. 50 Ohm matching

ALL UNITS ARE FOR COMMERCIAL SALES ONLY: MOQ

2 New models HFD and HFN

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Custom made RG316 PTFE Coaxial leads to BNC/”N”/PL259/SMA

New! Commercial mini matching units, can be built/supplied for 3 > 18MHz wideband (see sweep above) or just as a 49/1 single/multi frequency unit, ultra light at just 100g, fitted with mini BNC or SMA sockets, dual, tri and quad core versions rated at 50 w pep, resin potted, leads made up with RG316 PTFE coax. Superb for QMac units. Prices from £150.00 including coax leads.

Overseas commercial sales only

New commecial enclosures arrive, resin potted, PTFE BNC, SO239 or “N” type sockets, UV protected, new lower price, and the highest quality.

THE ABOVE UNITS ARE FOR OVERSEAS COMMERCIAL SALES ONLY: MOQ

Commercial enquiries email please use sales@rfcomms.co.uk

or email:g4icd@btinternet.com

COMMERCIAL ENQUIRIES WELCOME:

CLEARANCE ITEMS

ICOM BLOG UPDATE

Non commercial activities: Yaesu FTDX10 arrives and DC invertor news

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