02-07-2025, 01:56 PM
For network analysis there's the Nano VNA: https://www.tindie.com/products/hcxqsgro...-v2-plus4/
I took the top cover off the 415A a moment ago. There's an inner cover held on by about 20 screws before you can get at the PCBs. Another time. First port of call is obviously the battery. On that video it looks like a lithium thionyl chloride but it could be anything. Without schematics I won't know until I've opened it up.
I don't care too much about loss of calibration data. For most of my likely uses it will be better than I need, even uncalibrated.
All I was trying to do today was look at a UN1/163C 60kHz antenna. This BBC design is built in length of plastic drainpipe with end caps. https://www.bbceng.info/ti/eqpt/UN1_163.pdf This is intended for use with a BBC-designed MSF receiver which in turn sends time signals to a GNAT: https://www.bbceng.info/Designs/designs_...trbbc.html I've got all the kit temporarily until I take it to Richard Russell who designed the GNAT.
We have another GNAT at the Broadcast Engineering Museum but not the MSF kit. It will keep time (not very well) on its own xtal and while switched on it uses sync from our main SPG which is now GPS locked. This means it ticks at the right speed but actual time has to be set manually.
I took the top cover off the 415A a moment ago. There's an inner cover held on by about 20 screws before you can get at the PCBs. Another time. First port of call is obviously the battery. On that video it looks like a lithium thionyl chloride but it could be anything. Without schematics I won't know until I've opened it up.
I don't care too much about loss of calibration data. For most of my likely uses it will be better than I need, even uncalibrated.
All I was trying to do today was look at a UN1/163C 60kHz antenna. This BBC design is built in length of plastic drainpipe with end caps. https://www.bbceng.info/ti/eqpt/UN1_163.pdf This is intended for use with a BBC-designed MSF receiver which in turn sends time signals to a GNAT: https://www.bbceng.info/Designs/designs_...trbbc.html I've got all the kit temporarily until I take it to Richard Russell who designed the GNAT.
We have another GNAT at the Broadcast Engineering Museum but not the MSF kit. It will keep time (not very well) on its own xtal and while switched on it uses sync from our main SPG which is now GPS locked. This means it ticks at the right speed but actual time has to be set manually.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
