Japan Daiichi Radio Industries released the MF-430MHz band screw-driven antenna "RHM12" for easy mobile operation, which can also be operated in the 1.8/1.9MHz band, 3.5/3.8MHz band, and 4630kHz with a separate coil.
On October 18, 2021, Daiichi Denko Industrial Co., Ltd., an antenna manufacturer known for its "Diamond Antenna" brand, announced that it will release the RHM12, a vertical screw antenna with a pole-shaped antenna specification that is easy to connect with in late October. In addition to the separate RHM12 covering the 7 to 430 MHz frequency band, it is also possible to install an optional coil and correspond to the 1.8/1.9 MHz band and the 3.5/3.8 MHz frequency band, as well as the frequency of 4630 kHz as a connection setting for emergency communication. The antenna terminals are M-type and can be installed in a total length of 2.75 m in standard specifications, approx. 3.1 m when installing an optional 1.9 MHz band coil, and approx. 2.9 m when installing a 3.5 MHz band coil. The SSB has a 120W withstand input and the FM/CW has a 40W withstand input. The standard price (tax included) for RHM12 is 29,700 yen (RMB: RMB 1,663), the same as the old model RHM10, and the optional coil set RHMC12 is 12,980 yen (RMB: RMB 723).
The first radio wave industry screw-driven antenna "RHM12" and 3.5/3.8MHz band, 1.8/1.9MHz band optional coil group "RHMC 12". The vehicle photo is about 3.1m in the state of having a coil installed at 1.8/1.9MHz. In addition, it cannot be used while driving.
Daiichi Electric Wave Industries has previously released the "RHM10", a screw-driven antenna covering the 7-430MHz frequency band, and recently released a comprehensive update to the product "RHM12". Manufacturers want retail prices to stay the same starting with the RHM10 of the older model.
The new product uses a rod-shaped element with a total length of more than 2 m, and the maximum length is about 1 m longer than RHM10. In addition to enabling the flight and broadbanding of radio waves, a mechanism that simplifies QSY to the frequency band to be used is also adopted. In addition, by installing an optional coil, transceivers can be transmitted and received at 1.8/1.9MHz, 3.5/3.8MHz, and 4630kHz. In the HF band, in addition to the amateur radio band, it can also be matched, so it can also be used for shortwave broadcast reception, etc.
In addition, the antenna is used in a semi-fixed state of movement as a premise, and cannot be used in motion. The following is an excerpt from a press release issued by the company:
1.8-430MHz Band Screw Drive Antenna "RHM12"
(1.8/1.9MHz, 3.5/3.8MHz band optional)
The Company will start selling the RHM12, a screw-driven antenna from 1.8 MHz (MF band) to 430 MHz (UHF band) that is best suited for mobile connectivity. 1.8~1.9MHz and 3.5~3.8MHz optional coils are available, but the standard RHM12 monomer is 7MHz~430MHz.
From now on, the winter mobile connection season, not only the state of the day, but also the expansion of the coil by installing optional accessories, is the most suitable antenna for hams in the low frequency band that enjoy the night opening of the tower Yagi antenna.
In addition, a new type of pole element with a total length of more than 2 meters has been adopted, which further improves the broadband and jumpability.
<h1 class="pgc-h-arrow-right" data-track="23" > product features</h1>
Feature 1: TPS fast QSY of target band (tuning point scale function)
Tuning points can be intuitively selected from traditional digital displays. This allows for quick QSY by remembering the approximate position of each band.
Feature 2: QML (Quick Metal Lock) for smooth vertical adjustment and safety locking mechanism
By using metal materials instead of traditional resin materials, it is difficult to move even if shaken by the wind or accidentally touched, and can be firmly fixed and released.
TPS (Tuning Point Scale Function) and QML (Quick Metal Lock) allow for more comfortable operation.
<h1 class="pgc-h-arrow-right" data-track="75" > specifications:</h1>
Frequency: MF~430MHz (7~430MHz band at standard specifications)
Input resistance: 120W (SSB), 40W (FM/CW)
Length:
Standard specifications: Approximately 0.6 to 2.75m
When installing the 3.5MHz optional coil: up to about 2.9m
When installing a 1.9MHz optional coil: up to approximately 3.1m
Weight: Approx. 350 g (without optional coil)
Connector: M type
Scheduled for release: Late October 2021
Hope Retail Price:
RHM12: 29,700 yen (tax-included)
Optional coil RHMC 12:1,980 yen (tax-included)
It is scheduled to be released at the same time
RHM12 Dedicated 1.9MHz/3.5MHz Optional Coil "RHMC 12"
As an option to support the 7 to 430MHz screw-driven antenna "RHM12", we will release an additional coil "RHMC12" that can operate in the 1.9MHz and 3.5MHz bands. It can be operated by inserting it between the body coil and the rod element. In addition, by using a 3.5MHz band coil, it also supports 4630kHz emergency communication frequency operation, giving you peace of mind in an emergency.
RhM12 special optional coil setting "RHMC 12"
An example of an optional coil for the 3.5/3.8MHz band was installed on the RHM12
What do you think of this antenna as a full-band antenna for mobile applications in the coming season, or as an antenna that can be used at 4630kHz in an emergency? As soon as the detailed preparation of the product is ready, it will be published on the company's official website.
source: hamlife.jp