OM4001A
General description and the advantages of the OM4001A amplifier
The OM Power model OM4001A is an automatic power amplifier, designed for use on all short wave amateur bands from 1.8 to 29.7 MHz (including WARC bands) and all modes. It is equipped with a two pieces of ceramic tetrode FU728F.
The advantages of OM4001A:
-
Full compatibility with
- – ICOM
- – YAESU
- – ELECRAFT
- – Ten-Tec Orion
- – Kenwood
- – Icom transceive protocol using by microHAM devices –CI-V output (MK II, MK2R, MK2R+, etc)
- – Flex Radio Series 6xxx
- – Apache Labs Anan
- – ICOM
- RF sensitive Band and Frequency switching, for use with radios which do not have CAT
- Automatic switching between bands
- Automatic tuning with the band according to segments
- Automatic switching of band pass filter – BAND DATA output compatible with YAESU radios (BCD code)
- Automatic switching of the antenna switches – maximum number of antennas is 10, controlled by BCD output code
- Remote control via PC Windows Application
Specification of OM4001A:
Frequency coverage: | Amateur Bands 1.8 – 29.7 MHz including WARC |
Power output: | 4000+ W in SSB and CW on HF bands, 3000W in RTTY and DIGI modes |
Input Power: | Usually 40 to 60W for full Output Power |
Input Impedance: | 50 Ohm, VSWR < 1.5 : 1 |
Power Gain: | 17 dB |
Output Impedance: | 50 Ohm unbalanced |
Maximum Output SWR: | 3:1 |
SWR protection: | Automatic switching to STBY, when reflected power is 350W or higher |
Intermodulation distortion: | -32dB below nominal output |
Suppression of harmonics: | < -50 dBc |
Tubes: | 2x FU728F Ceramic tetrode |
Cooler: | Centrifugal blower + Axial blower |
Response speed of AUTO tune: | less than 0,5s within same BAND ,less than 3s if out of BAND |
Power supply: | switchable 2 x 220/230/240V – 50 Hz one or two phases |
Transformers: | 2 pcs of toroidal transformer 3kVA |
Dimensions: | 485 x 200 x 455mm (width x height x depth) |
Weight: | 46 kg |
Protection circuits: | – VSWR |
– Anode current too high | |
– Anode voltage error | |
– Screen current too high | |
– Screen voltage error | |
– Grid current too high | |
– Grid voltage error | |
– Heating voltage error | |
– Mistuning of PA | |
– Temperature too high | |
– Soft start for protecting your fuses | |
– “switch-on blocking “ at opened amplifier | |
Indications: | 4.3″ colour touch screen display |
Features: | High level of protection |
Memory for faults and warnings, easy maintenance | |
Automatic set-up anode current (BIAS) – no need to adjust manually after changing the tubes | |
Three programmable working modes of the axial blower | |
Full QSK with silent relay | |
Many operational parameters to display | |
The smallest and lightest 4000 W Power Amplifier on the market |
LAN Connection
Power amplifier is interfaced to LAN via XPORT made by Lantronix (type XP1001000-05R). More info can be found at www.lantronix.com .
Default factory settings of XPORT are:
IP address: 192.168.1.222
Mask: 255.255.255.0
Gateway: 192.168.1.1
These are strictly default settings. You can modify any of these by going to XPORT web GUI via your web browser. We do not recommend changing any other parameters of the XPORT interface as loss of communication can be caused by doing so. There is no default user name or password. It is highly recommended to secure web interface with username and password.
For remote control and monitoring over LAN special software is needed. It is available free of charge, it can be downloaded from the following address:
https://www.om-power.com/download/HF4_PA_Manager_v3.25-setup.exe.
Antenna
Hy-Gain AV-680 9 Band Vertical Update Video
Hy-Gain AV-680 9 Band Vertical Hy-Gain Multi-Band PATRIOT Vertical Antennas 9-band vertical covers 80/40/30/20/17/15/12/10/6 Meters • No radials • No... Read more
AIM 4170D Antenna / Lab RF Analyzer
The AIM 4170D antenna analyzer measures the complex impedance (magnitude and phase) at each frequency of interest in the range of 0.1 to 180 MH... Read more
Second Rule of Antennas : Height Matters!
Sergei, UB4LDT, has some questions having to do with the height of his antenna? But the basic rule is height matters! Read more
G3TXQ 6 Band Hexbeam Components
Some of the Hexbeams features are: 6 bands: 20m – 6m Full size 2 Elements on each band No lossy traps or coils Bespoke HIGH power wire elements... Read more
The Antenna SA-680HP covers 10 through 80 meters
The SA-680HP covers 10 through 80 meters with supplied 6 foot whip. • Length retracted: 39” Extended:57” • 3 inch dia... Read more
VHF
The Best DMR Radio? Anytone AT-D878UV Bluetooth GPS
To fully utilize all the features you have to use Windows PC to program this radio. Not Compatible with CHIRP and RT systems software. FCC Part 90 C... Read more
6000km TEP path on 144 MHz opens up between Buenos Aires and the Dominican Republic
Hot on the heels of the last post about the 5400km TEP opening on 144 MHz between Argentina and the island of Aruba, we have details of some more cont... Read more
Yaesu FT5D FAQ
During the release of the FT5D from Yaesu, I interviewed John Kruk from Yaesu to talk about the new FT5D. Here are some of the more frequently asked q... Read more
Es’hail-2 geostationary amateur radio transponders talk
Es’hail-2 Graham Shirville (G3VZV) & Dave Crump (G8GKQ) update us on Es’hail-2 and its amateur radio payload at the AMSAT-UK International S... Read more
Best Handheld Ham Radio 2021
Today I go through my top 15 Handheld Ham Radios for 2021 – as an update to my Best Handheld of 2020 video, this is a list of both new and exist... Read more
Digital Modes
The Ultimate Portable Ham Radio Computer
Hello Operators. In this episode of the OH8STN ham radio, we are discussing replacing the raspberry pi field computer build, with the Microsoft Surfac... Read more
Get Started with FT8 – An Introduction for Beginners
FT8 is a mode in the WSJT-X software developed by Dr Joe Taylor K1JT. In this video I show how to get started and make contacts with FT8, introduction... Read more
WSJT-X Version 2.5.1 has been Released
The WSJT-X development team has announced the general availability release of WSJT-X version 2.5.1. This release mainly contains i... Read more
WSJT-X Errors? Try This Simple Fix
Does WSJT-X display errors when you transmit with your radio? Try this simple fix which has helped me get rid of those frustrating errors. Read more
WSJT-X version 2.5.1 released
WSJT-X version 2.5.1 releasedThe development team have announced the General Availability (GA) release of WSJT-X version 2.5.1. This release mainly co... Read more