[VK2KFJ] Modifications for the TYT TH-9800 FM quad-bander mobile transceiver

[VK2KFJ via rec.radio.amateur.moderated Admin]

VK2KFJ Blog

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Modifications for the TYT TH-9800 FM quad-bander mobile transceiver

Posted: 21 Aug 2017 07:54 PM PDT
http://vk2kfj.blogspot.com/2017/08/modifications-for-tyt-th-9800-fm-quad.html

These TH-9800 quad band FM transceivers (a clone of the Yaesu FT-8900
transceiver) have an issue of blowing the transmit driver FET. I have
documented a modification to fix this, as it would be a considerable amount
of work to replace the drive FET, or even the PA FET for that matter.
Easier to do the mod and run at less output power than have a dead tx PA.
It basically adding a 8v (7808) regulator into the supply circuit for the
Driver FET, which is fed hot from the 13.8v DC input.

http://www.qsl.net/vk2kfj/th9800.html




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Reducing RFI from your vehicle for operating mobile

Posted: 21 Aug 2017 07:06 PM PDT
http://vk2kfj.blogspot.com/2017/08/reducing-rfi-from-your-vehicle-for.html

I have documented the modifications to my 4WD vehicle that I use for
mobile and portable operation. It was only that in past year I have decided
to operate HF, whereas in the past I only ever had VHF and UHF equipment,
so RFI radiating out and also from within the vehicle was not so much of a
problem, but is more so for HF. My web page includes photos.

http://www.qsl.net/vk2kfj/holden_jackaroo.html

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VK5KK microwave photos from WIA AGM Hahndorf 2017

Posted: 21 Aug 2017 08:13 PM PDT
http://vk2kfj.blogspot.com/2017/08/vk5kk-microwave-photos-from-wia-agm.html

these are the photos I took of David VK5KK's microwave equipment display,
held on the Open Day, as part of the WIA AGM weekend, 21st May, 2017,
located at the Hahndorf Oval.

David was operating all bands from 1.2GHz through to 122GHz ,including the
10GHz EME station.

http://www.qsl.net/vk2kfj/vk5kk_microwave.html