Solid State Linear Amplifier
|
* With external accessory filter unit |
The Gemini HF-1K is a solid-state 1kW 1.8MHz – 50MHz power amplifier with additional capability at 472kHz. It uses a single dual-LDMOS power device for reliability, and has an internal highly reliable low-noise switching power supply, in order to reduce the overall weight. The thermal design is very conservative with a large heatsink, and OFHC heatspreader. This, assisted by several fans and a sophisticated thermal management system, allowing the channel temperature of the LDMOS device to remain within limits which should ensure extended life, even with with heavy usage.
A major objective of the RF design has been to significantly exceed the spurious signal generation requirements of the international approvals standard (ETS 300 783 pts 1 and 2) for amateur radio equipment. To this end the Gemini HF-1K has more extensive filtering than is usual in HF PAs.
While LDMOS power FETs are amongst the most rugged RF power amplifier devices currently available, they are sensitive to RF overdrive. The Gemini HF-1K has both extensive monitoring to minimise the risk of damage by overdrive and a conservatively designed input circuit.
Following modern industrial practice, the Gemini HF kW employs full touch-screen control using a 480 x 272 pixel 108mm mm full colour TFT display. A wide range of monitoring functions can be displayed, including power output, PA drain current, VSWR, heatsink temperature, and linearity. The latter parameter provides a graphic indication of when the amplifier power output enters the region where ‘splatter’ will be generated.
As with other Linear Amp UK designs, there is no provision for ALC, as this is a major cause of bad signals.
While the control system provides for manual band selection, it will interface seamlessly with standard CAT systems. The presence of valid in-band signals is also detected and will initiate switching automatically to that band.
A high-speed, very low distortion, PIN diode, solid-state switching circuit will allow very fast full break-in operation.
A single input and three selectable antenna output connectors are provided. The latter can be preset on a band by band basis.
A 0dBm SMA feedback output is provided to allow connection to transmitters with linearisation capabilities.
The amplifier is built in a very robust all aluminium case. A modular assembly approach has been adopted with non-RF and high current DC interconnects being distributed as a single bus.
Outline specification.
Operating frequencies: 460 – 479kHz*
1.8 – 2.0MHz
3.5 – 4MHz
5.0 – 5.5MHz
7.0 – 7.3MHz
10.1 – 10.2MHz
14.0 – 14.4MHz
18.0 – 18.2MHz
21.0 – 21.5MHz
24.8 – 25.0MHz
28.0 – 29.7MHz
50.0 – 54.0MHz
*when used with an external accessory low pass filter unit
Power output: >1 kW at 1dB gain compression (200W+ on 460-479KHz)
Power input: 5, 10, 25W, 100W, customer specified
3rd order IMD distortion: better than -30dB at 1kW
11th order IMD distortion: better than -70dB at 1kW
Harmonic suppression: better than 70dB (all harmonic products)
Input VSWR: better than 1.5:1
Load VSWR tolerance: <1.5:1 for best performance with 2:1 high VSWR trip.
Note: the specifications given above should be achieved in production units, but cannot be guaranteed at this time. Linear Amp UK has spent a great deal of money on purchasing accurate high-end test equipment – which we know how to use – and does its utmost to ensure that the equipment we manufacture exceeds our claims for its performance.
See More:Link
Contesting clubs in Canada and New England have joined forces to invite non-hams, new hams, and even old timers to discover HF radio in the 21st centu... Read more
Cocos Island Costa Rica TI9A is not only Dxpediton, it is not only DXCC most wanted #26 , is not only IOTA# NA 012 We are in close coop... Read more
Look what arrived at my mailbox! This is the Icom ID-52E, the newest Handheld Ham Radio from Icom, which includes DSTAR. Let’s take a look at th... Read more
See Full Results : Link Read more
GENERAL TRANSCEIVER SPECIFICATIONS Technology Solid State SDR-DSP Direct Conversion Frequencies / Bands 1.8 MHz to 54.0 MHz 160, 80, 60, 40, 30, 20,... Read more
Check great article about Emergency Communication from Robert Richardson : Read more
com have announced firmware updates for the IC-7700 and IC-7800 Amateur Radio HF Transceivers. Each firmware provides the same improvement incl... Read more
The HobbyPCB RS-UV3 radio module is a 144/220/450 MHz FM transceiver board. The RS-UV3 is a low cost transceiver solution for Packet Radio, repeaters,... Read more
The ARRL Board of Directors Legislative Advocacy Committee is in the process of drafting a new bill to address the issue of private land-use restricti... Read more
“In this video you will find information about the Heil HS2 handheld PTT switch that I use with my 2 Kenwood radios (TS-2000 and TS-990), thanks... Read more
Ham Radio Deluxe Integrated Software for Logging, Rig Control, Digital Modes, Satellite Ham Radio Deluxe – 6.4.0.888 0002735: [Bug] Logbo... Read more
Due to the ongoing COVID-19 response and mitigation actions, the 2020 Armed Forces Day (AFD) Crossband Test scheduled for Saturday, May 9, has been po... Read more
Recent Posts
“Discover the HF Experience” Aims to Dazzle Technicians, Newcomers
TI9A Cocos Island Costa Rica Project
Icom ID-52 First Look! – New Icom Handheld Ham Radio | DSTAR
Worked All Europe DX Contest (WAEDC) RTTY 2014 Claimed scores
Aerial-51 SKY-SDR
OFF-GRID HAM RADIO: Simple Emergency Communication When the Grid Goes Down
Icom Firmware Updates for the IC-7700 and IC-7800
Radio Shield RS-UV3
ARRL Legislative Advocacy Committee Drafting New Bill Addressing Antenna Restrictions
Heil HS2 Hand PTT switch for 2 radios with MFJ-1263
Ham Radio Deluxe v6.4.0.888 released and available for download
Annual Armed Forces Day Crossband Test Postponed
Warning: file_get_contents(https://plusone.google.com/_/+1/fastbutton?url=https%3A%2F%2Fqrznow.com%2Flinear-amp-gemini-hf-1k-1-8-50mhz-1kw-solid-state-linear-amplifier%2F): failed to open stream: HTTP request failed! HTTP/1.0 404 Not Found in /home/qrznow/public_html/wp-content/themes/goodnews5/framework/functions/posts_share.php on line 151
![Reviewing the Icom ID-52E 5W D-STAR Transceiver [ ICOM UK ]](https://qrznow.com/wp-content/uploads/2022/01/maxresdefault-1-90x60.jpg)
![Reviewing the Icom ID-52E 5W D-STAR Transceiver [ ICOM UK ]](https://qrznow.com/wp-content/uploads/2022/01/maxresdefault-1-180x120.jpg)
