[VWS] Re: antennas from scrap computers

[Richard Demaret]

Looks very interesting.
Thanks
Richard
Ki4KXJ

On Sun, Oct 30, 2022 at 10:22 PM Jacek Radzikowski <
jacek.radzikowski at gmail.com> wrote:

> Another good source of power amplifiers for the 13cm band is equipment for
> satellite stations for communication through OQ-100. Almost immediately
> after its launch several years ago the satellite became a very popular mode
> of communication, and there are many sources of relatively cheap TX
> hardware for such stations. This is an example of an 20W PA for the 13cm
> band: http://www.sg-lab.com/AMP2400/amp2400.html
> The downlink uses the 3cm band, so unlike the wifi amps, the 13cm
> amplifiers are TX only.
>
> Jacek
> kw4ep
>
>
> On Sun, 30 Oct 2022 at 21:15, Jacek Radzikowski <
> jacek.radzikowski at gmail.com> wrote:
>
>> Most of the wifi amplifiers should also cover the ham radio band. You may
>> have to modify the activation circuit, because they use signal sensing to
>> switch between RX and TX
>>
>> Jacek
>> kw4ep
>>
>>
>> On Sun, 30 Oct 2022 at 21:11, Martin <dcmk1mr2 at gmail.com> wrote:
>>
>>> Sorta related - does anyone know of amps in the 13 cm ham range that put
>>> out more than a 0.5 W?
>>>
>>> Martin W6MRR
>>>
>>> On Sun, Oct 30, 2022 at 2:05 PM Samudra Haque <samudra.haque at gmail.com>
>>> wrote:
>>>
>>>> Phased arrays? PA controller chips are plentiful
>>>>
>>>> On Sun, Oct 30, 2022, 15:53 Alex Fraser <beatnic at comcast.net> wrote:
>>>>
>>>>> You can fit a whole bunch of 13 centimeter band antennas in a small
>>>>> plastic jar.  That's just what I did when I scrapped out some older
>>>>> laptops.  The antennas are usually behind the display screen so when it is
>>>>> being used the antennas sit up a bit from your desk.  The tiny coax runs
>>>>> behind the screen and next to the hinges to the WiFi card on the laptop's
>>>>> motherboard.
>>>>>
>>>>> It looks to me like some of these antennas are J Poles, I hope you can
>>>>> see where I circled the matching coax location.
>>>>>
>>>>> My application for these antennas is as  replacements for busted WiFi
>>>>> antennas on a DJI Phantom 3 drones video and telemetry download radio.  I
>>>>> bought the drone used and it had been in a crash, so I got a good price.
>>>>> The original antennas had their cables yanked apart. The originals were
>>>>> panel antennas and go used for  $20 ~ $30. I might try both kinds and see
>>>>> how they work in the crazy drone environment. Drones move around so
>>>>> polarity and pattern have to be figured into the antennas.  There is a lot
>>>>> of ham input into the drone hobby.  Having almost 40 years experience
>>>>> playing with antennas sure helps...
>>>>>
>>>>>
>>>>> [image: Antennas]
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