WWW.RFCOMMS.CO.UK is an R&D advisory/design/supplier to Commercial and Security organisations requiring RF antenna matching solutions for many different applications including AT DF systems (Direction Finding). With over 50 years of HF/VHF Communications knowledge we design and manufacture the highest quality HF 2 > 30MHz (0.3db insertion loss) and VHF 30 > 78MHz (0.0db insertion loss) RF matching transformers some using up to 16 cores per unit and made to Mil 810G specification. Various power levels can be offered on most 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.
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
HF: The HF High impedance hybrid matching transformers produce single and/or multiple RESONANT frequencies. The transformers can be made in various configurations plus special hybrid versions with a maximum insertion loss of 0.3db using custom made F14 Ni/Zn ferrite cores. Using this technology single or blocks of HF resonant frequencies can be created for day/night time operation for commercial HF users.
VHF: The VHF (30 > 78MHz) versions are available in 4 banded ranges as listed below.
Above & Below: New 125 watt HF or 50 watt, 30 to 78MHz matching units (higher power units available for VHF), low through loss (0.3db) on HF and zero loss on VHF, all 50 ohms. HF or 4 banded VHF frequency ranges 30 > 45, 35 > 50, 45 > 60 and 55 > 78MHz, extremely efficient, no grounding required, no tuner required. Ruggedized enclosure IP68, resin potted. BNC or “N” type connectors suggested.
Below: UV protected enclosure which is resin potted, stainless steel mounting and line strain relief eyes, PTFE SO239 with options of BNC or “N” type connectors, heavy duty Mil spec line connector post. New multi-core high power versions now available with “N” type sockets only. Made to your specific requirements. Prices from £125.00 MOQ
Below: Small lightweight HF units available for low power commercial transceivers like the QMac HF90 etc
Above: Multi-cores wound with Mil spec DEF 210 PTFE wire. BNC, SMA, MINI 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. Also available are lightweight VHF 30 to 78MHz L/C units. BNC, SO239 and “N” type sockets available. MOQ.
Below: Strong UV protected tube enclosures up to 100mm dia.
High quality custom made units from £125.00
ABOVE: New Low cost Heavy Duty double F14 cores
ABOVE: New Low cost Heavy Duty double cores capable of 400w pep.
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.