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
ARRL offers a series of six posters that promote Amateur Radio to the general public. These were originally designed by ARRL for the 2017 National Sco... Read more
Ham Nation 176: Bob Sets Up His 1962 EICO Hosts: Bob Heil (K9EID), Gordon West (WB6NOA), George Thomas (W5JDX), Don Wilbanks (AE5DW), and Amand... Read more
This brand-new EXTIO DLL bring new (cool) features: Remote SDR stream selection (no need to change the configuration file anymore), Remote spectrum di... Read more
RFinder – The World Wide Repeater Directory is a database of Amateur Radio repeaters worldwide. We have 60.000 repeaters in 170+ countries. We h... Read more
The Hurricane Watch Net (HWN) has announced plans to activate for the now-Category 4 Hurricane Irma on Tuesday, September 5, at 1800 UTC on 14.325 MHz... Read more
“Longtime CQ World Wide DX Contest Committee member Doug Zwiebel, KR2Q, has been named Director of the CQ World Wide DX Contest,CQ magazine Publ... Read more
Rufus P. Turner W3LFFirst Black Radio Station Operator, 1926 “Rufus Paul Turner (December 25, 1907 – March 25, 1982)was an academic, engi... Read more
Hurricane Michael An array of Amateur Radio public service assets is active as Hurricane Michael made landfall near Mexico Beach on the Florida Panhan... Read more
Update Feb 5th 2019, 16:36 UTC: Feedback is overwhelming, will try to update this page as good as possible! Note that we will only receive signal stre... Read more
Product Description Band Hopper 3 Multiband Portable HF Dipole Antenna System NEW FOR 2015 – add a high performance balun for just £4.95! At a g... Read more
“We demonstrate the two major new features of the latest version of Yaesu’s “991” series, the FT-991A. Watch the colour screen... Read more
“W3LNE calling CQ, CQ, CQ for all Scout Ham radio operators, CQ, CQ, CQ. If you are you a Ham and a Scout, I have a question for you. Have you i... Read more
The Indonesian amateur radio society ORARI report that on Monday, September 28, 2015 04:30 hours UT, the LAPAN-A2/ORARI satellite was launched from th... Read more
Edmonton, Alberta & El Centro, California – November 13, 2015 – Alfa Radio, home of the highly regarded AlfaSpid antenna rotator line... Read more
EK1C 3 band QRP CW transceiver for 20, 30, 40 meters. 5 watts power output from 12 VDC. Internal keyer, extended receive coverage, sold as an assemb... Read more
Recent Posts
New ARRL HamRadio promotional posters to use for your club’s outreach efforts!
Ham Nation 176: Bob Sets Up His 1962 EICO
New EXTIO DLL for Cloud-SDR
RFinder Android Radio First Test !
Hurricane Watch Net to Activate for Hurricane Irma
Doug Zwiebel, KR2Q, Named Director of CQ World Wide DX Contest
W3LF – First Black Radio Station Operator, 1926
Amateur Radio Assets Active as Category 4 Hurricane Michael Makes Landfall
Help required in final tests before MarconISSta deinstalled
Three-band portable dipole antenna system
YAESU FT-991A Colour Screen and Waterfall Demonstration
Apply Ham Radio to All Scouting Activities
LAPAN-A2 FM and APRS satellite launched
Alfa Radio, Ltd. Appoints Hector Garcia Authorized AlfaSpid USA Service Rep
EK1C 3 band QRP CW transceiver for 20, 30, 40 meters
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
![Do Dipoles Have to be Straight? [ The Doctor is In Podcast ARRL ]](https://qrznow.com/wp-content/uploads/2019/05/s-l1000-90x60.jpg)
![Do Dipoles Have to be Straight? [ The Doctor is In Podcast ARRL ]](https://qrznow.com/wp-content/uploads/2019/05/s-l1000-180x120.jpg)
