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
M2 Antenna Systems, Inc. is a blend of technical expertise and common sense approach to accommodating your needs. We have over 32 years of experience... Read more
The FCC has fined a Georgia radio amateur $1000 for failing to properly identify. A Forfeiture Order issued to David J. Tolassi, W4BHV, of Ringgold, w... Read more
In an enforcement case prompted by complaints filed in 2017, the FCC has imposed an $18,000 forfeiture on Jerry W. Materne, KC5CSG, of Lake Charles, L... Read more
Can you hear me now? Lenoir Amateur Radio Club goes old school, but helps out Photo: Gina Story/Special to the Hickory Daily Record Thomas Land... Read more
“After reading many antenna articles in the Internet and a couple ARRL antenna books I got interested in physically small HF antennas. My... Read more
Features Super-fast deployment – takes less than a minute! Great performance from a full-size dipole element Great flexibility for mounting and... Read more
Ham Radio Deluxe News: Ham Radio Deluxe Version 6.3.0.472 Released Tampa, FL; Dallas, TX; St. Paul, MN — January 26, 2016 HRD Software, LLC announces... Read more
by DAVID JEANS MAROONDAH LEADER BITTER opposition from neighbours has failed to stop plans for an 8m radio mast to be installed in a Ringwood North ba... Read more
Amateur Radio Emergency Service (ARES) groups in counties along Florida’s east coast are now at a Level 2 (local) activation for Hurricane Matthew. A... Read more
Randy WW6RG will be active from Diego Garcia, Chagos Islands – IOTA AF-006, 25 to 30 May 2016 as VQ9RA. QSL via home call. Source: Read more
The Planetary Society’s citizen-funded LightSail 2 solar-propelled spacecraft is set to launch on June 22 on board a SpaceX Falcon Heavy. It will atte... Read more
An update of the popular MMSSTV slow-scan television (SSTV) software is now available. Eugenio Fernández, EA1ADA, has introduced YONIQ, which he calls... Read more
Meet the Raspberry Pi” is the topic of the new (February 28) episode of the “ARRL The Doctor is In” podcast. Listen…and learn! Sponsored by DX... Read more
The ARRL DXCC Department has approved for DXCC credit the unexpected P5/3Z9DX “demonstration” operation from North Korea last December. Well-traveled... Read more
Recent Posts
New Website! M2 Antenna Systems Inc
Georgia Radio Amateur Fined $1000 for Failure to Properly Identify
FCC Levies $18,000 Fine on Louisiana Amateur Radio Licensee
Can you hear me now? Lenoir Amateur Radio Club goes old school, but helps out
Antenna experiment – Fractal Quad for 28 Mhz band
Multi-Function Portable Antenna System for 2m
Ham Radio Deluxe News: Ham Radio Deluxe Version 6.3.0.472 Released
An 8m amateur radio mast has some Ringwood North residents worried about health concerns and property values
Florida Coastal ARES Groups at Local Activation Level, Statewide Declaration Pending
VQ9RA Diego Garcia AF-006
LightSail 2 Set to Launch on June 24
New SSTV Software Now Available
Meet the Raspberry Pi – “ARRL The Doctor is In” podcast. Listen…and learn!
ARRL Okays P5/3Z9DX North Korea Operation for DXCC
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
