[linrad] MAP65 progress

["bluewin.ch; hb9dri@xxxxxxxxxxxxxxxx>]

Hi Joe, Leif and all

Well not to much happens regarding our progress testing MAP65, in 
HB9Q we finish the  feeder installation on our 15m dish but until now 
I can not put the WSE converters to work, main problem is to control 
the LO on the WSE, simple doesn't work. But our main problem was 
time, i just back from a complicate knee surgery and I'm recovery now 
at home. HB9Q is 100 km far way from my QTH means i need to wait some 
weeks and back to work on the WSE converters.

I did some test in my network and I find the configuration very 
simple but until know I have no chance to test over the Air, I try to 
use MAP65 on HF (14.076 Mhz) at home I have not EME antennas but 
MAP65 is fix on JT65B and on HF mode is JT65A, maybe some can Joe fix 
on the next versions to test the decoding

Based on the extra time I have now at home I start to build a "poor 
man WSE converters", for sure the core will be linrad and the use of 
some softrock lite v6.2 receptors to produce 4 audio channels (having 
adaptative polarization is my goal). I'm close to finish the front 
end part, 2 receptors down from 144 Mhz to 14 Mhz using for both 
receptors a 130 Mhz LO (same amplitud and phase) and a +17dbm mixer, 
the second part are 2 softrock receptors with a diplexer in front 
plus a 14 Mhz IF amplifier, both softrock receptors share the same 
LO.

I'm not desing nothing special, I decide to try that on the KISS 
way (keep it simple and stupid), I use some mmic amplifiers like 
GALI74, ERA5 and MAR6, 3 pole helical filters on the Front end part 
and a good desing for the LO (thank's leif for the ideas in your 
homepage) to have very low phase noise, the final part will be the 
DELTA44 and Linrad

For Linrad I want to see if I have any advantage to run Linrad 
under linux, if some body give me good arguments maybe I try my first 
Linux setup, please dont tell me one is better than the other one, 
I'm not interested in how good or bad is one or the other OS, I only 
want to know advantge when i run LINRAD under LINUX otherwise I will 
keep the Windows version.

For this "poor man WSE converter" I dont expect equal or better 
performance than the orginal WSE converters, dont worry Leif your WSE 
converters are the really State of the Art,  I only want to build 
that for pure experimentation, i know the softrock receptors are 
simple but also are mediocre to bad in IP3 and intermodulation 
products, if everything go and run maybe I decide to produce 
something better on the back end part instead of the softrock, is 
better to have Adaptative polarization even with this mediocre system 
than nothing.

I will share my progress on my homepage (as soon I finish the 
webpages) but please this project is not for somebody who cares until 
the las DB fraction, IP3 levels or high performance, is more related 
with a system can work with less money but off course with less 
quality, its a compromise,  I want to see how bad can be the numbers. 
For this project the only instruments I have is a Spectrum analyzer 
up to 1.5GHZ ( no tracking generator), a 30 Mhz osciloscope and a 
Fluke RF probe. Maybe a serious evaluation need to be done by some 
body with more experience and instruments than me.

Ideas and recomendations are welcome

Best regard to all


Alex Artieda
HB9DRI

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