Isotron 30
SKU Part Number: ISO-40
Easy, Quick, and Simple Installation. Tunes & Performs Without Radials or Antenna Tuners. Handles Up to 1000 Watts PEPSize (H x W x D) 22" x...
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£69.00 £57.50
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Easy, Quick, and Simple Installation. Tunes & Performs Without Radials or Antenna Tuners. Handles Up to 1000 Watts PEP

  • Size (H x W x D) 22" x 16" x 15"
  • Bandwidth: 250 Khz (Bandwidth is within 2:1 SWR. May vary with environment.)
  • Impedance: 50 - 75 ohms
  • Freq. Range: 10.100-10.150 Mhz
  • Power Input: 1000 watts PEP (300 watt, CW (AM, FM, RTTY, etc.)
  • Wind Load (sq. feet): 1.0
  • Wind Rating: 85
  • Pattern: Omni
  • Weight: 4 lbs.
- Download PDF Manual
GETTING AN HF ANTENNA TO WORK.10:@@:

 

GETTING AN HF ANTENNA TO WORK.10

Last article was on matching the Radiation resistance of the antenna to 50 ohms. Observing with a Noise Bridge and using the earth ground to affect match.

 

What if the antenna is way up in the air out of reach?

 

This is where a little forethought will help. No matter where you put your antenna, give attention to being able to bring it down easily.

 

Many operators use pulleys to do this. They mount it in the trees, on poles, towers or where ever you plan to install your antenna. With a rope system, the feed point of the antenna can be lowered for access and maintenance.

 

The best place to check the antenna is where it will be fixed. Not always the best place to make measurements.

 

Using the Noise Bridge, you can connect the little instrument to the feed point of the antenna with a double male connector. Set the X control on 0 and the R control to 50. Then send it up into the permanent position. Go to your receiver and observe the noise generated from the bridge. Now you can scan the band to find the point where the noise is minimum. This will be your resonant point and should be addressed first. If you need to lower or raise the frequency of the antenna, this is the time to do it.

 

If you have found that the minimum noise is not completely gone, then you can drop the antenna again and move the R control slightly in either direction. If you still have your phone handset to hear the receiver, then you can make this final assessment at the antenna site.

 

If you are doing a fixed antenna on a tower that needs to be climbed, take the Noise Bridge and phone up with you. You can do all your work at one time while up there.

 

If you are going to use a metal pole to mount your antennas, give it some thought about being able to tilt the pole over easily for tuning and maintenance. There is a variety of pulley arrangements that can make raising and lowering the mast quite easy.

 

Using the Noise Bridge takes a little pre-planning. Are there analyzers that can test an antenna from the convenience of the radio room? There are. Next article will mention what to look for.

 

73,

Ralph WD0EJA

February 2014

BILAL COMPANY

137 MANCHESTER DR.

FLORISSANT, CO. 80816 U.S.A

PH/FX: 719/687-0650

wd0eja@isotronantennas.com

 

OUR EMAIL LIST IS ACQUIRED BY PERSONS WHO HAVE CONTACTED US IN THE PAST.

IF YOU DESIRE NOT TO BE CONTACTED PLEASE EMAIL YOUR REQUEST.

mailto: mailto: wd0eja@isotronantennas.com

 

  • Size (H x W x D) 22" x 16" x 15"
  • Bandwidth: 250 Khz (Bandwidth is within 2:1 SWR. May vary with environment.)
  • Impedance: 50 - 75 ohms
  • Freq. Range: 10.100-10.150 Mhz
  • Power Input: 1000 watts PEP (300 watt, CW (AM, FM, RTTY, etc.)
  • Wind Load (sq. feet): 1.0
  • Wind Rating: 85
  • Pattern: Omni
  • Weight: 4 lbs.
  • Easy, Quick, and Simple Installation
  • Tunes & Performs Without Radials or Antenna Tuners
  • Handles Up to 1000 Watts PEP
  • Durable Construction, Can be Used in Extreme Weather Conditions
  • Excellent For Portable Operation - Emergencies, RV's, Field Day, Motels, Etc.
  • Multi-Band Operation on One Feedline with Back-to-Back Mounting & NO Loss of Performance
  • Can be mounted in ANY Position Without Loss of Performance - Omnidirectional
  • Maritime Operation - Uncluttered, w/Stainless-Steel Fasteners & Not Dependent Upon Grounding for Performance
  • SO-239 Connector on All Models -- All exhibit 50 to 75 ohm load
  • One Year Warranty on Material & Workmanship
* Bandwidth is within 2:1 SWR. May vary with environment. Power rating is 300 watts for AM, FM, RTTY, CW, etc.
** Multi band units are made by putting standard single band isotrons in parallel, using ladder line or coax (Coaxial T's, coax jumpers and ladder line not included)

Shipping:

We have several shipping options for our products, including next-day and Saturday/Sunday delivery for certain items. Please see these options at checkout.

Returns:

If you have any equipment that needs to be returned to Martin Lynch & Sons, please fill out the form below:

Click here for returns form

Upon receipt of goods you have 14 days to return goods however the goods must be returned in original packaging and care must have been taken with the goods you wish to return. Under distance selling regulations you are not entitled to any refund on carriage charges or modification charges made at your request.

Warranty Terms and Conditions

Outside of the 14 faulty return period, returned items cannot be accepted, unless covered by manufacturer's warranty. We will repair as much as possible on site however in exceptional circumstances products may have to be returned to the manufacturer of distributor.

For repairs/replacements under manufacturer’s warranty for any item please download a ML&S return form from the link below and return to ML&S with the faulty product.

International Warranty information

Warranty service for items we sell is available in the U.K. only, unless otherwise noted. It is your responsibility to pay freight for returned items to the U.K. and back to you for desired warranty coverage. All of our NEW products come with a minimum 12 month warranty, (Yaesu & Icom 24 months), with up to 90 days on second-hand equipment. Items returned for service must state "returned goods for repair" on the return air waybill or U.K. import customs duties apply and will be added to your invoice. For more info about returning items please contact our customer help desk, sales@hamradio.co.uk