!WANTED! ATU8750 250 and 500 Hz filters other parts, Manuals, stuff !WANTED!
„Thrane & Thrane A/S“ hereby allows [you]Gregor Fismer DF2IC to post the Skanti TRP8000 Technical Manual on [your] his webpage under the following condition:
The modifications done to the equipment is in no way approved/supported by „Thrane & Thrane A/S“ and is fully the owners own responsibility. „Thrane & Thrane A/S“ will not be responsible for any damage or injury caused by these modifications. (October 22. 2009)
I am the happy owner of several fine transceivers made by Skanti in Denmark ( Skanti has now become a part of Thrane & Thrane) The TRP8000 line of transceivers comes in different models: the TRP8250 with 250W output, the TRP8400 with 400W output, and the TRP8750 with 750W output. I used to own at least one complete set of every Model. ( I have sold my TRP-875x, but still have the TRP-825x/840x) Each model then has several Types, depending on the intended area of use of the transceiver. (on the first pages of this file I have included a comparison chart of the different Types) So, you find Types that can handle only channel operation in the Marine bands, and types that can do all modes on any frequency. According to the Type, the keyboard layout on the Control Unit changes, but you may use all keys - even if they are not visible - once you have activated the underlying function in the Config PROM. The Types can be converted into each other by simply setting certain values in the Configuration PROM. The three sub-Units of the system are connected to each other by control cables that can be up to 50m long, and there exists an optional Remote Control Unit that allows remote controlling the transceiver over a telephone line or over the Internet. Though the Antenna Tuning Unit is a pleasure to use, the Transceiver Unit can be operated into any 50 Ohm load without the ATU. My main transceiver is a TRP8455: TX 400W output 1.6 to 30MHz continous coverage, RX 100KHz to 30MHz continous coverage, Full-QSK, CW/AM/USB/LSB/MCW, 150Hz + 250Hz CW Filter. The PA is all solid-state and fully convection cooled, so there is no extra noise from any Fans, blowers, etc. Over the time, a lot of stuff has accumulated and I‘m always happy if I can help others, by answering questions or by swapping parts.
Here comes a compilation of FAQ‘s, asked by Skanti owners from all over the world. If your question is not answered here, or if you need more info, please don‘t hesitate to contact me:
Q: My Control Unit does not have all the buttons, like CW, BFO, etc.
A: The missing functions can all be activated in the Configuration PROM, and if you then push the empty space on the Control Unit - right where the button should be located - it all works. If you are lucky, you find a new keyboard Overlay on eBay, but the missing functions have to be activated in the Config PROM anyway.
Q: How can I activate LSB transmission capabilities?
A: Address 4084d/FF4h in the Configuration PROM must be set to have the value 6d/06h.
How to?
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1.Extract the Config. PROM
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2.Save the Config. PROM‘s content to a file
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3.Edit the file at the appropriate address
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4.Erase the PROM by exposing it to UV light
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5.Re-write the edited configuration file to the PROM
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6.Re-insert the Config. PROM and enjoy!
Q: How can I activate/deactivate the ALARM keys, keyboard layout, etc. etc.
A: You must change a value at the appropriate address in the Config. PROM. The Value/Address pairs are described in the Technical Manual. A partly copy can be found here.
Q: Must I always use separate antennas for RX and TX?
A: No, the TRP8xxx series is intended to be used under a wide variety of conditions. Take a look inside of your ATU, chances are good that it is equipped with the optional Antenna Relay Board (PCB 641). Still, you need two coax cables between the ATU and the Transceiver Unit (TU). Another option is the Antenna Relay (PCB 630), which is installed in the Front door of the TU. This was intended to be used in installations where the ATU is not needed, because of broadband 50Ohm antennas. But you may use it together with the ATU, which then needs only one coax cable, connected to the TX terminal. This is, in my opinion, the most interesting setup for a Radio-Amateur. Unfortunately PCB 630 is difficult to find. But it is easy to replicate, look here.
One more option: PCB 644 is a 50Ohm ATU Relay, that can be used together with PCB 630, and is built into the ATU. This would be a useful setup if you plan to operate Split-band with one antenna. (not terribly useful for Radio-Amateurs)
Q: Everytime I turn on my radio, the sound volume is at maximum, and so is the beep-tones volume.
A: The backup battery in your Control Unit is empty and needs to be replaced. According to the Technical Manual the battery should be changed within four years after its installation. It is a Lithium battery that can be ordered from Electronic wholesalers, like „Conrad“ in Germany.
Q: Where can I download the Technical Manual?
A: A partly copy can be downloaded here. This copy contains no Schematics, as I don‘t have the facilities to scan them.
Q: Is it possible to use the ATU with my Hamradio transceiver?
A: Yes, sure. Have a look at this article. It is written in Danish, but you should be able to get the idea. By the way, the ATU8250 is designed to handle 250Watts under no-matter-what conditions, so if you take care that the antenna is long enough it easily handles 400 - 600 Watts. The ATU8750 can handle a full 1KW! This article describes typical antenna installations for the ATU8250.
Q: I heard you mentioning a „Remote Control „ for the TRP8000. What is that?
A: Here is an Application Note from Skanti, that describes the setup in detail.
Q: I disconnected the ATU and connected my 50 Ohm antenna instead. Whenever I start TXing the Power Meter starts flashing for abt. 10 seconds.
A: A strap must be placed between terminal No.6 (TUNE) and terminal No.7 (TPR) of 620-TS1.
Q: My transceiver came without the Power Supply Unit. What are the power requirements?
A: The TRP82xx and TRP84xx operate at voltages between 10.6 and 41.6 VDC, so any 12, 24 or 32 VDC Power Supply or battery is fine. Max. power consumption CW keydown: TRP825x abt. 600Watts; TRP84xx abt. 900Watts.
