HF Impedance Transformer Kits

Portable and Mobile Radio RFI Solutions

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Portable operation is fun but also brings challenges to the radio operator concerning receiver “noise” levels, RF interference from adjacent sources including close by transmitting stations, and RFI from portable generators. A typical scenario and some suggested Palomar product solutions are shown in the picture.

Portable Operation RFi Reduction Picture png - HF Impedance Transformer Kits

Portable operation is typical of ham radio operating events such as Field Day, Summits on the Air, Route 66 events, National Parks on the Air, California QSO party, DXpeditions, and emergency operation command posts, etc.

Suggestions

Each low power operating station with a generator should have:

  1. Generator RFI Kit (Part # RFI-GEN) with FSB31-1 ferrite filters at each end + Nylon ties for security
  2. Transceiver RFI Kit (Part # RFI-XCVR)
  3. Laptop RFI Kit (Part # RFI-1C)
  4. Coax Cable Noise Filter (Part # CMNF-1)
  5. Bullet-55 portable HF end fed antenna system


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982840112 - HF Impedance Transformer Kits
AC/DC Generator RFI Noise Filter Kit - 3" ID - 2 filters
AC/DC Generator RFI Noise Filter Kit - 3" ID - 2 filters
SKU RFI-GEN-3
$74.95
982840124 - HF Impedance Transformer Kits
AC/DC Generator RFI Noise Filter Kit = 1" ID - 2 filters
AC/DC Generator RFI Noise Filter Kit = 1" ID - 2 filters
SKU RFI-GEN-1
$39.00
2981648739 - HF Impedance Transformer Kits
CB Radio Generic Mobile Transceiver RFI/Noise Reduction Kit, RFI Range: 20-60 MHz, Works on all brands
CB Radio Generic Mobile Transceiver RFI/Noise Reduction Kit, RFI Range: 20-60 MHz, Works on all brands
SKU RFI-CB-MOBILE
$19.95
On Sale
4502924397 - HF Impedance Transformer Kits
Coax Common Mode Noise Filter - 500 Watts PEP, 1-60 MHz, -38dB Common Mode Noise Suppression!
Coax Common Mode Noise Filter - 500 Watts PEP, 1-60 MHz, -38dB Common Mode Noise Suppression!
SKU CMNF-500-50
List price $79.95
Save 13%
$69.95
On Sale
4493391009 - HF Impedance Transformer Kits
Coax Common Mode Noise Filter - 500 Watts PEP, 100 KHz-30 MHz LF & BCB up to -46db Noise Reduction
Coax Common Mode Noise Filter - 500 Watts PEP, 100 KHz-30 MHz LF & BCB up to -46db Noise Reduction
SKU CMNF-500-50LF
List price $79.95
Save 13%
$69.95
On Sale
940463405 - HF Impedance Transformer Kits
Coax Inline Common Mode Choke Unun - 500 Watts 25-300 MHz- 10, 11, 6, 4, 2 Meters
Coax Inline Common Mode Choke Unun - 500 Watts 25-300 MHz- 10, 11, 6, 4, 2 Meters
SKU FC-8X-3-31
List price $39.95
Save 30%
$27.95
940463405 - HF Impedance Transformer Kits
Coax Inline Common Mode Choke Unun - 500 Watts 50-450 MHz
Coax Inline Common Mode Choke Unun - 500 Watts 50-450 MHz
SKU FC-8X-5-61
$39.95
On Sale
1025194824 - HF Impedance Transformer Kits
DC Voltage Common Mode Noise Filter - Marine, RV, Communications, 600 Volts/30 Amps
DC Voltage Common Mode Noise Filter - Marine, RV, Communications, 600 Volts/30 Amps
SKU RFI-DC-30
List price $109.95
Save 18%
$89.95
4029027008 - HF Impedance Transformer Kits
HF Mobile Transceiver RFI and Noise Reduction Kit, RFI Range 1-300 Mz
HF Mobile Transceiver RFI and Noise Reduction Kit, RFI Range 1-300 Mz
SKU RFi-HF-MOBILE
$39.95
982808125 - HF Impedance Transformer Kits
HF Transceiver RFI/Noise Reduction Kit, RFI Range 1-300 MHz, 5 Filters
HF Transceiver RFI/Noise Reduction Kit, RFI Range 1-300 MHz, 5 Filters
SKU RFI-XCVR-STD
$39.95
On Sale
581468960 - HF Impedance Transformer Kits
Laptop Computer with DC power RFI Kit - 7 Filters
Laptop Computer with DC power RFI Kit - 7 Filters
SKU RFI-Laptop
List price $34.95
Save 14%
$29.95
4266711302 - HF Impedance Transformer Kits
MAXI-CHOKER Coax Line Isolator/Balun, 1-61 MHz, 1.5/3KW, SO-239 In/Stud Output, FLAGPOLE OCF, G5RV, ZS6BKW, BN4000 Replacement, Ladder Line-Coax interface
MAXI-CHOKER Coax Line Isolator/Balun, 1-61 MHz, 1.5/3KW, SO-239 In/Stud Output, FLAGPOLE OCF, G5RV, ZS6BKW, BN4000 Replacement, Ladder Line-Coax interface
SKU MC-1-1500LL
$89.95
4029797252 - HF Impedance Transformer Kits
MAXI-CHOKER Coax Line Isolator/Choke, 1-61 MHz, 1.5/3KW/5KW, up to -60 Db Common Mode Rejection, Static Bleeder Option
MAXI-CHOKER Coax Line Isolator/Choke, 1-61 MHz, 1.5/3KW/5KW, up to -60 Db Common Mode Rejection, Static Bleeder Option
SKU MC-1-1500
$89.95
4222605655 - HF Impedance Transformer Kits
MINI-BALUN 1:1 Coax Interface to Ladder Line, Dipole elements, 500 Watts PEP, up to -38Db Common Mode Rejection, 1-61 MHz, Flagpole, Dipole, Beam and G5RV/ZS6BKW Antennas
MINI-BALUN 1:1 Coax Interface to Ladder Line, Dipole elements, 500 Watts PEP, up to -38Db Common Mode Rejection, 1-61 MHz, Flagpole, Dipole, Beam and G5RV/ZS6BKW Antennas
SKU MB-1-500SS
$69.95
1112255372 - HF Impedance Transformer Kits
MINI-CHOKER Coax Line Isolator, 500 Watts PEP, up to -38Db Common Mode Rejection, 1-61 MHz, 1:1 Unun
MINI-CHOKER Coax Line Isolator, 500 Watts PEP, up to -38Db Common Mode Rejection, 1-61 MHz, 1:1 Unun
SKU MC-1-500-50
$69.95
3548913921 - HF Impedance Transformer Kits
Maxi-Choker, 1:1 Line Isolator 3KW, 7-54 MHz Optimized for Wide Band Log Periodic, HF & 6M Beams. Noise Suppression up to 38 dB
Maxi-Choker, 1:1 Line Isolator 3KW, 7-54 MHz Optimized for Wide Band Log Periodic, HF & 6M Beams. Noise Suppression up to 38 dB
SKU MC-1-3000LP
$109.95
581498047 - HF Impedance Transformer Kits
RFI Kit for Electric Fuel Pump Interference (4 filter set)
RFI Kit for Electric Fuel Pump Interference (4 filter set)
SKU RFI-FP
$29.95
581480060 - HF Impedance Transformer Kits
VHF/UHF Generic Base Transceiver RFI Kit
VHF/UHF Generic Base Transceiver RFI Kit
SKU RFI-VHF-BASE
$49.95
581480060 - HF Impedance Transformer Kits
VHF/UHF Generic Mobile Transceiver RFI/Noise Reduction Kit - Up to 500 MHz
VHF/UHF Generic Mobile Transceiver RFI/Noise Reduction Kit - Up to 500 MHz
SKU RFI-VHF-MOBILE
$19.95
1008627783 - HF Impedance Transformer Kits
Wall Wart RFI Noise Filter Bulk Pack of 10 Filters
Wall Wart RFI Noise Filter Bulk Pack of 10 Filters
SKU RFI-WW-10
$29.95
982840116 - HF Impedance Transformer Kits
Wall Wart RFI Noise Filter Bulk Pack of 100 filters
Wall Wart RFI Noise Filter Bulk Pack of 100 filters
SKU RFI-WW-100
$199.95
1008627776 - HF Impedance Transformer Kits
Wall Wart RFI Noise Filter Pack (5 filters)
Wall Wart RFI Noise Filter Pack (5 filters)
SKU RFI-WW-5
$16.95
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These impedance transformer kits have been designed for the Do-It-Yourself (DIY) enthusiast and Instructor workshops on baluns and ununs for antenna matching and RFI use.

The impedance transformers are classified in ratios of 2:1 (100:50 ohm) to 16:1 (800:50 ohm).  The outputs can be configured as balanced (Balun) or as unbalanced (unun) with respect to the inputs which are considered all unbalanced coax at 50 ohms.  All impedance transformers are designed for 1.8-31 MHz unless otherwise specified.