T-4 Plus & T-4G Plus

and

T-4-500

Updated 2/3/18

Items on this page are no longer available.
They are shown on this page only for reference.

"The RFI Quick Fix™"

"The Ground Loop Solution™"

T-4G Plus is shown; the T-4 Plus does not have the ground strap.

How does the Line Line Isolator system work?

A graphical explanation

These Line Isoaltors are no longer available. They are list only as a reference.

	T-4-500	T-4 Plus & T-4G Plus
Type	Current	Current
Design Impedance	50 ohms in and out	50 ohms in and out
Operating Bandwidth	160 - 6 m	160 - 6 m
Power Loss, dB	Nil	Nil
Saturation Resistant	Yes	Yes
Internal Transmission Line Z	50 Ohms	50 Ohms
Core Type	Ferrite	Ferrite
Power Rating @ 3.5 MHz	500 PEP watts PEP if SWR < 2:1, SSB/CW duty cycles *	> 1500 watts if SWR < 3:1, SSB/CW duty cycles *
Phase Delay	Unspecified	6.2 degrees @ 3.5 MHz
Load Variation Tolerance	Excellent	Excellent
Input connector	SO-239	SO-239
Output Connector	SO-239	SO-239
Size	1.75" x 4.75"	2.3" x 8"

* Not rated for AM, RTTY or other high duty-cycle modes.

The T-4 Plus and the T-4G Plus are identical to the former T-4 and T-4G respectively but now have increased bandwidth.

The T-4-500 has an isolation factor that is higher than the standard models. They are far smaller in size and weight, too. the power rating is 500 watts PEP SSB/CW service. This makes them perfect for interconnecting a transceiver and a linear amplifier. In low power installations, considerable space can be saved using the T-4-500.

Applications: Top-of-the-line, maximum isolation Line Isolators. Replaces 4KRF-LI, 4KV-LI and T-3 with specifications exceeding those it replaces. Use in all RFI applications and as a retrofit device following standard baluns used in antenna already fitted with a balun.

The Big Gun weapon in the fight against RFI

The RFI Quick Fix™

High isolation Break up ground loop more effectively Stop RFI End RF feedback problems Does not affect signal path or antenna matching

For really tough RFI and RF feedback problems, you can't beat the new T-4 Plus and T-4G Plus Line Isolators™. The T-4G Plus shunts stray RF directly to ground with its built-in ground strap. Stray RF hasn't got a chance, yet signal attenuation is zero!

Use the T-4 Plus when a direct ground path is not possible.

The T-4 Plus is perfect for use with Vertical Antenna system. Install at the antenna's feedpoint. If you can install a T-4G Plus you have the ultimate in Vertical antenna feedline isolation.

If you have one of the new rigs which covers HF + 6 meters, then the T-4 Plus or T-4G Plus are the ideal choices.

Install the T-4 Plus between transmitter and linear. If you have ground loop problems, there is no more effective way to break them up than with the incredible isolation of the T-4 Plus.

Install the T-4 Plus between the transmitter or linear amplifier and your tuner. Use single-point ground at the tuner (all equipment ground go to the tuner ground as does the ground wire to your ground system) in combination with the T-4 Plus and you're tuner works like it's supposed to and so does your linear.

Using a T-4 Plus following the balun supplied with your beam and produce a measurable improvement in F/B and F/S ratios. There is no better way to eliminate feedline radiation.

If you are using a coil of coax as a choke balun, the T-4 Plus or any of our Line Isolators™ will be far more effective.

IMPORTANT

The "R" models have all been sold. This information is for reference only.

T-4 Plus and T-4G Plus Line Isolators are no longer available. I ran out of parts. A few new Line Isolators using toroidal cores and 3" x 4" cases are being made, but the quantity will be limited. The part numbers will be T-4 Plus R and T-4G Plus R. The "R" means replacement since I didn't change the product number otherwise. The performance of the "R" (replacement) models is the same or better than the old type. When the parts run out, Line Isolators will not be available any longer. See my web store's home page for more information.
Ignore the drawings on the description page. The new case is identical to the Remote Balun in size but will have a Silver/Teflon SO-239 connector on each end.

When your order one of the new Line Isolators, the part number on your order will be the same as the older version. It won't have the "R". This saves me a lot programming time. You'll get the new "R" models. There are none of the older T-4 series left.

You'll need a jumper cable to connect Line Isolators™ between equipment.

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More detailed graphic on the operation of Line Isolators

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