WWW.RFCOMMS.CO.UK is an R&D advisory/design/supplier 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 and VHF 30 > 70MHz RF matching transformers some using up to 16 cores per unit and made to Mil 810G specification. Power levels of up to 5 kw can be offered on some configurations. We offer Current & Voltage baluns, and Un/Uns plus custom made RF chokes for optimum attenuation required in the HF spectrum for noise and returned RF plus antenna symmetry. NOTE: Commercial sales only.

“STOP PRESS MAY”

COVID 19 CRISIS: We are open for commercial business but due to postal restrictions we can only deal with couriers for overseas customers. 

See the following pages: MATCHING UNITS: TACTICAL KITS

 HF & VHF Matching Units

Above & Below: New 125 watt 2 > 30MHz or 50 watt 30 > 70MHz matching units (higher power units available for VHF), low through loss (1.3db) on HF and zero loss on VHF, 50 ohms, uses half-wave length of wire for required single or banded frequency range.  2 > 30MHz or 4 banded VHF frequency ranges 30 > 45, 35 > 50, 45 > 60 and 55 > 70MHz, extremely efficient, no grounding required. Ruggedized enclosure IP68, resin potted. BNC or “N” type connectors suggested.

Small lightweight units available for low power commercial transceivers like the QMac HF90

Multi-cores wound with Mil spec DEF 210 PTFE wire. BNC, SO239 or “N” type sockets. Stainless steel line support strain relief and rear mounting. Cores are resin potted for stability and IP rating. High quality and low cost. MOQ

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Guanella Current Baluns

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

NEW CORES-NEW IDEAS

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.

A perfect match: eg: 50 > 200 ohms

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.

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