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All posts for the month October, 2016

Want one of these; search for “SGVU-L” @ ebay.
I am planning to use this in displaying RF-power measurement, but it needs some modifications. So stay tuned……………

Here is some more info:
I got this of ebay as a kit. PCB’s are very nicely build. Kit comes with LM3916 chips, which is a semi logarithmic VU meter LED driver.
Cascading six of these don’t really make any sense if you want to use it as a meter for readings.
So, I have replaced the LM3916 with one LM3915 logarithmic 3 dB/step driver chip for the ten first LED segments, then five LM3914 linear LED driver follows for the rest of LED segments.
Of course this is for one channel only, so you need 2 x LM3915, and 10 x LM3914 for doing both channels.

 

Will be participating in the ARRL EME 50 to 1296 MHz Contest this weekend. My band will be 144MHz in digital mode only. I have been working on giving my QRPp setup a 3dB boost for this weekend, but I had to abandon this due to mechanical difficulties. (Antenna staking hardware was not strong enough to hold the antennas straight, back to the drawing board I guess.) 🙂 My setup: Band: 144, mode: digital, antenna: 13,4dBd, power: 100-150w Good luck all!

20161021_153811

This morning I decided to do some work on the good old Kenwood TS-2000.

The MULTI/CH encoder is operating erratic and has getting worse lately. I replaced that with new one.

The MULTI/CH encoder is operating erratic and has getting worse lately. I replaced that with new one.

Replaced the 144MHz UHF-type antenna connector with a N-type jack.

Replaced the 144MHz UHF-type antenna connector with a N-type jack.

Installed the 1.2GHz Tx Distortion mod/fix by VE2ZAZ

Installed the 1.2GHz Tx Distortion mod/fix by VE2ZAZ