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Before yesterdayHam Radio Blogs

Project TouCans Lab Notebook: Getting Rid of the Noise

✇Copasetic Flow
By: noreply@blogger.com (antigrav_kids KD0FNR)
24 July 2024 at 01:03

 I finally landed at a quiet tape vs. noise  configuration for TouCans on Saturday afternoon. Here’s how.


In the picture above, the wires circled in green include the + and - power wire, (white and red respectively), and the keyer wire, (also red.) When I taped the bundle of wires including the single turn coil shown in the white wire to the side of the can, the noise from the power supply went away. I was left with only noise from the radio, (the kind I want), and a gentle hum from the power supply because it had switched into buck converter mode to step its voltage up to the required 15V! The helicoptering from the Pico-W was also almost gone.

In other parts of the project, the Pico-W has started burning through pairs of AA batteries rather quickly.

More F2 Skip Cesium Development Notes

✇Copasetic Flow
By: noreply@blogger.com (antigrav_kids KD0FNR)
29 May 2024 at 11:48

 Here's the query I'm using for Burr Trail



============================================

select

  tx_lng,

  tx_lat,

  rx_lng,

  rx_lat,

  rm_rnb_history_pres.timestamp,

  rm_rnb_history_pres.dB,

  rm_rnb_history_pres.Spotter,

  haversine(tx_lat, tx_lng, rx_lat, rx_lng) as total_path,

  gis_partial_path_lat(tx_lat, tx_lng, rx_lat, rx_lng, 200) as el_lat,

  gis_partial_path_lng(tx_lat, tx_lng, rx_lat, rx_lng, 200) as el_lng,

  id,

  strftime('%Y%m%d', timestamp) as date,

  strftime('%H%M', timestamp) as time,

  'US-4399' as park,

  'KD0FNR' as call,

  1770.829467773438 as elev_tx

from

  rm_rnb_history_pres

where

  dB > 100

  and timestamp > '2024-05-27'

  and timestamp < '2024-05-28'

order by

  rm_rnb_history_pres.timestamp desc

=======================================================


At some point I'll add an ionosonde field using this map for each QSO. For the Boulder, CO ionosonde, the query will look like

=========================================================

select

  tx_lng,

  tx_lat,

  rx_lng,

  rx_lat,

  rm_rnb_history_pres.timestamp,

  rm_rnb_history_pres.dB,

  rm_rnb_history_pres.Spotter,

  haversine(tx_lat, tx_lng, rx_lat, rx_lng) as total_path,

  gis_partial_path_lat(tx_lat, tx_lng, rx_lat, rx_lng, 200) as el_lat,

  gis_partial_path_lng(tx_lat, tx_lng, rx_lat, rx_lng, 200) as el_lng,

  id,

  strftime('%Y%m%d', timestamp) as date,

  strftime('%H%M', timestamp) as time,

  'US-4399' as park,

  'KD0FNR' as call,

  'BC840' as ionosonde,

  1770.829467773438 as elev_tx

from

  rm_rnb_history_pres

where

  dB > 100

  and timestamp > '2024-05-27'

  and timestamp < '2024-05-28'

order by

  rm_rnb_history_pres.timestamp desc

limit 1

====================================================================

The extra ionosonde field works!!! 

References

Ionosonde Data

This was made possible with data collected by 


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