KD8CEC Amateur Radio

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EU1KY AA Firmware stabilization version update (V0.4) and mores about v0.4

Posted: 24 Apr 2019 06:56 AM PDT
http://www.hamskey.com/2019/04/eu1ky...n-version.html

EU1KY AA Firmware stabilization version update (V0.4) and mores about
v0.4V0.4 has been changed to the stable version without changing the
version number.

I and testers tested for about a week and did not have any problems, so I
added V0.4 to the stable version list.





1.Download stabilization version
Click below for more information on the stabilization version.
http://www.hamskey.com/2019/03/eu1ky...tabilized.html


Version 0.4
http://www.hamskey.com/2019/04/relea...c-version.html


How to create AA
(Information is constantly being updated)
http://www.hamskey.com/2019/02/assem...0-antenna.html

2.Additions about digital mode with Antenna Analyzer
From V0.4, WSPR, FT8 and JT65 transmission functions have been added.

There were reports that the antenna analyzer alone succeeded in the WSPR
beacon without any hardware modifications or additional circuitry.

For low power WSPR, please refer to the link below.
https://a29.veron.nl/hams/pa1b/wspr-with-10-milliwatt/

If your antenna performance is OK, connect the antenna connector to S2 of
the Antenna Analyzer and try to transmit the WSPR.


2.1 If you want to increase the output, see below.
If your antenna performance is not as good as me, you can use WSPR by
increasing the output as shown below.

You may be able to increase the output with just a few parts.
- https://kk9jef.wordpress.com/2016/05...qrp-amplifier/
- http://www.knology.net/~gmarcus/Si53..._WSPR_XCVR.pdf

The simpler method is to use the following parts.

It is an LNA that can be purchased for about $ 6 to $ 8 on eBay or
AliExpress.

When I tested it, the output was about 300mW. I used this and a car whip
antenna and got a pretty long distance WSPR report.
It is very weak, but you can add LPF if you need it.



3.Things working on these days
Various experiments related to VNA (S2 - S1)

3.1 I used a short coaxial cable when testing the S21-Gain.
It is possible to measure about -40 ~ -50dB up to about ~ 150Mhz.

3.2. If a diode is added as shown below, connect a -10dB attenuator between
S2 and S1.
(OK2BUH)


If you do not use a diode like me, you do not need to add anything.


3.3 There was an experiment that adjusted impedance using BGA616
(thanks dummy load). The tester switched the impedance by changing the
switch.
He says there is no need to this mod.


3.4 Experiment S21-Gain with controllable atteunator
I and DH1AKF talked about controllable attenuators a few weeks ago.

Below is a photograph of the experiment sent to me by DH1AKF.


Below is another form of PE4302 that arrived to me today.
This is only for attenuation experiments, so there is no need to use
Antenna Analyzer.





Again say, this module is not required for using the Antenna Analyzer. You
do not have to buy it.

Thank you for reading

Ian KD8CEC