DIAMOND RHM12 Multiband Mobile Talkie Antenna User Manual

DIAMOND RHM12 Multiband Mobile Talkie Antenna User Manual

OPERATION INSTRUCTIONS

To use the antenna properly, read these instructions thoroughly before using it.
Keep this manual carefully at hand for later use.

Safety Precautions

Note beforehand that the company shall not be liable for any damages suffered by the customers or third parties in using that product, or for any failures and faults that occur the use or misuse of this
product, unless otherwise provided for under the law.

Type and meaning of the marks

DANGER

• Don’t install the antenna on a rainy or windy day since it is dangerous.
• Don’t touch the antenna during transmitting since it is dangerous.
• If there is a thunderstorm during operation, stop the operation immediately and remove the cable from the transceiver. If that doesn’t make it in time, don’t touch the antenna and the cable. It may be severely injured or die due to getting and electronic shock from a lightning strike.

WARNING

• Don’t drop the antenna, tools and attachment when installing the antenna in the height. Install the antenna after assembling it on the ground.
• Install the antenna firmly not to fall down due to the strong wind. Even if falling down the antenna, locate the antenna at the safe place where people and building are not inflicted injures.
•  Don’t attempt to install the antenna only by yourself. Installing the antenna alone on the roof may lead you dangerous accident. Always ask your friends for help installing the antenna

CAUTION

• Make sure to adjust the antenna before using it.
• Install the antenna as far away as possible from any obstacles to obtain its maximum performance.
•  Keeping transmitting with high VSWR may cause the transceiver to be damaged. Stop transmitting immediately and check the antenna.
• When transmitting, operate within the specification of the transmission power. It is a big burden on the antenna on FT8 etc. Don’t operate over the specification of the transmission power. The antenna may

• Description 1.

The RHM12 can be operated on 1.9/3.5MHz bands using the optional coils (not included). It is also possible to tune the emergency communication frequency (4650kHz) using the 3.5MHz optional coil.
(Japan only) 2. It is easy to adjust the frequency by the adjustment position scale. 3. Approx. 2 m rod element makes high efficiency and band expansion. 4. It is easy to lock the coils. 5. It is suitable for portable operation.

• This product is not waterproofing so it cannot be used at the rainy day and at the place where it gets wet.
• This product is designed as portable use and temporary installation. Don’t use it while driving.
  

How to ground (counter poise)

This product needs ground for all bands (except for 430MHz). SWR will not be lower without ground.
SWR meter shows lower SWR value in spite of lack of ground because high frequency current superimposes on the coaxial cable. Radio wave radiates from the coaxial cable. It may cause interference.
Make sure to ground. Our CMF2000 (common mode filter) has deterrent effect.
Refer to the below examples to ground.

[Note]

• The number and length of grounding wire are determined depending on the installation place, conditions, and frequency.
• It is susceptible to wind because the antenna is long. In case of installing it on the tripod, use the counterweight etc. to prevent falling down.
• This product is designed as portable use and temporary installation. Don’t use it while driving.

<Adjusting on 50/144MHz band> <Regarding 430MHz band> Keep the coil body down at the very bottom on It is possible to operate on 430MHz band using 50/144MHz band. Make the rod element length 430MHz radial and 430MHz element. (SWR may approx. 1.13m (counting 6 rod from the bottom + a not be lower depending on the installation few cm). Adjust the rod element length as same as conditions and grounded.

Prevention of interference due to lack of ground

The high frequency current at some frequency band may superimpose on the coaxial cable due to lack of ground. If the high frequency current superimposes on the coaxial cable, the device
may be inoperable on the transmission status. We recommend to use our CMF2000 to prevent the defects. It is possible to cut the igh frequency current to the coaxial cable.

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