CO7WT on SO-50... first try...
Hi to everybody,
I (CO7WT) was active on the midday pass (~1720Z) yesterday...
I tried to make a contact but my RX radio is deaf.. it's a TK-860 channelized commercial radio that shows reduced sensitivity on the ham band (I know that now...)
I was with an hombrew DK7ZB yagui of 6 elements and about 15dB of gain but copies the signal so weak... it was just a try to test the gear, Hector (CO6CBF) is guiding me about operation skills and told me that I was loud in the pass and let every one calling for me... for those ho heard me that time, please I'm sorry... this was only a test.
I will try to re-tune my commercial UHF radio for the ham band and will try the contact in the future... so wait for me, and you will get the FL11 grid...
73, CU on the birds from CO7WT.
Hi,
Yesterday evening I get hands on the tools and eyes on the gear, and manage to deduce a procedure to adjust the sensitivity of my RX rig...
This was great, just with a Digital Multimeter measuring the noise level at the RSSI on the FI IC of the radio I squeezed the sensitivity of the rig to it's maximum... (from 0.45 v at the original setting to 1.1 v whit my setting)
There has to be a more efficient ways, buy whit the tools on my hand this is the only way...
From not hearing any station with the 15dBd yagui to 3 contacts on the night pass of SO-50 with only 13 degrees in the pass... That's a difference...
So CO7WT is ACTIVE on FL11 in every SO-50 pass that I can work... My setup is working OK now.
Thanks to N8RO, K4FEG and WA4NVM to be my first satellite contact on the bird, LoTW upload in progress...
I will to be active today in the 1638Z pass if you want to make a contact.
73
El 06/02/13 10:32, Ing. Pavel Milanes Costa escribió:
Hi to everybody,
I (CO7WT) was active on the midday pass (~1720Z) yesterday...
I tried to make a contact but my RX radio is deaf.. it's a TK-860 channelized commercial radio that shows reduced sensitivity on the ham band (I know that now...)
I was with an hombrew DK7ZB yagui of 6 elements and about 15dB of gain but copies the signal so weak... it was just a try to test the gear, Hector (CO6CBF) is guiding me about operation skills and told me that I was loud in the pass and let every one calling for me... for those ho heard me that time, please I'm sorry... this was only a test.
I will try to re-tune my commercial UHF radio for the ham band and will try the contact in the future... so wait for me, and you will get the FL11 grid...
73, CU on the birds from CO7WT.
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----- Original Message ----- From: "Ing. Pavel Milanes Costa" pavel@conas.cu To: amsat-bb@amsat.org Sent: Thursday, February 07, 2013 3:20 PM Subject: [amsat-bb] Re: CO7WT on SO-50... successful try !!!
Hi,
Yesterday evening I get hands on the tools and eyes on the gear, and manage to deduce a procedure to adjust the sensitivity of my RX rig...
This was great, just with a Digital Multimeter measuring the noise level at the RSSI on the FI IC of the radio I squeezed the sensitivity of the rig to it's maximum... (from 0.45 v at the original setting to 1.1 v whit my setting)
There has to be a more efficient ways, buy whit the tools on my hand this is the only way...
Hi Costa,
Without using a Noise Generator in front of your RX and without switching it ON and OFF, tuning the front end circuit of your receiver for maximum swing of the noise level on the Digital Multimeter, it is possible that your actual 1.1 volt is corresponding to maximum gain and before the original 0.45 volt was corresponding correctly to minimum Noise Figure and so to maximum sensitivity.
In a separate email I have sent to you the schematic diagram of a very simple diode Noise Generator.
73" de
i8CVS Domenico
participants (2)
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i8cvs -
Ing. Pavel Milanes Costa