WWW.RFCOMMS.CO.UK are designers/suppliers to Commercial organisations requiring RF antenna matching solutions. With over 50 years of HF/VHF Communications knowledge we design and manufacture the highest quality HF (2 > 30MHz) RF matching transformers using up to 16 cores per unit and made to Mil 810G specification. Power levels of up to 10 kw can be offered on some configurations. We offer Current and Voltage baluns and Un/Uns plus custom made RF chokes for optimum attenuation required in the HF spectrum of noise and returned RF.


 VHF Matching Units

Above: New 125 watt 30 > 70MHz Matching unit (higher power units available), no through loss, 50 ohms, uses half-wave length of Kevlar wire or matt black stainless steel whip/mount for required frequency, stainless steel fittings that are matt black including rf socket, 4 banded frequency ranges 30 > 45, 35 > 50, 45 > 60 and 55 > 70MHz, extremely efficient. Available in vertical and horizontal formats and vehicle mounts. BNC or “N” type connectors. Minimum MOQ 10 units.

Above: New core technology!. Our multi HF frequency Hi-Impedance 49/1 – 56/1 or 64/1 Un/Un matching units offer “A new Generation of 2 > 30MHz Wide-band HF Antennas”. Developed in 2016 offering single and multiple resonant frequency operation from one simple wire and dispensing with old style inefficient TFD commercial antennas. No losses, no matching resistors, no masts needed, just multi Ni/Zn cores wound with Def Std 210 PTFE wire, stainless steel fittings, spring loaded connector, line strain relief, back or top mounting hook, UV protected enclosure, 3 > 30MHz, lightweight and top commercial quality. Options of BNC/SO239 or “N” type sockets. Various enclosures available Minimum MOQ 10 UNITS


Helically wound verticals and Loops using hi-impedance matching units.

Under going trials is RFCOMMS 2 mtr long 50mm diameter fibre glass helical vertical with top radiator, the unit uses no earth or radials as it is a single or multi  resonant frequency end fed and matched using a near zero loss Hybrid combination of cores (resonant end fed un/un) installed in the main tube offering multi frequencies and/or wide-band high power operation, also under trial is a 1 mtr (26mm dia tubing) and a 1.5 mtr diameter helical loop (50mm dia tubing) which uses similar technology of the above matching units with near zero loss, no tuning capacitors, no matching resistors, and high power operation. No tuner/matcher required for either unit. Perfect resonance for transmission and reception (TX/RX) single or multi-band with no adjustments required. Loop can be turned to eliminate interference.

Above: Our 4/1 Guanella Current balun, multi-core, extremely high quality: Other versions include un/un and voltage versions, all fully resin potted.


We are currently studying the use of FSCP (Fully Sintered Crushed Powder) which is a loose powder available in Zinc/Ni/Mn, this can be mixed with a polymer such as nylon and compounded to produce non breakable cores with irregular shapes, it also offers the choice to make high precision HF/VHF cores.

After many months of experimentation with new core materials and new designs we have now produced outstanding results offering superb balance and excellent return loss. The new designs are mostly multi-core units using PTFE Mil spec wire in PTFE tube and are available in both voltage & current configurations with different ratios available. MOQ is 10 units custom made and available to commercial users and trade businesses, samples of the smaller units are available for a nominal cost to bonafide dealers. Available as a discrete component to incorporate into each antenna or available as a resin potted boxed unit. (SEE BELOW)

New custom made cores with a new Ni/Zn mix has given us ultimate control of return loss and provides a perfect solution for the ultimate unit. 2 to 16 cores are used depending on the ratio, I or V configurations, and power requirements.


We now have a stock of very heavy duty “K” material cores after persuading a manufacturer to make a re-run of the old core design , these are the finest cores available and have been used in commercial designs for over 50 years by the professionals. Comparing these cores with for example the Amidon FT240-K they are nearly twice the size (see picture below). Our specially built version is on the left hand side. Just look at the difference in size, 4 x times the surface area! RFCOMMS are now the sole supplier of these cores.

“K” type material cores

High Power top of the range 5kw HF Chokes offering very high levels of attenuation of returned RF

Shown with 7/16 Connectors, “N” type adaptors if needed for lower power rating, RG142 Double Screened PTFE Coax.

Up to 5kw pep using dual heavy duty custom made cores. Stock item POA.

Resin potted for life in UV protected enclosure, all A4 Stainless hardware.

Connectors available depending on power requirements include 7/16 EIA DIN, “N” type, SO239, BNC all certified PTFE insulation

Extremely high Z Mag attenuation and high power handling:

Using silver plated PTFE coax and “N” type connectors up to 3KW can be handled from DC to 100MHz