ezCol question

[Conrad Cardano]

Hi

I received recently the scope-in-a-box.

I have an external 50ohn resistor.

Is there a way to use this 50ohm resistor with exCol in order to create a reference file for

exRA?

Thank you 

Conrad

[Andrew Thornett]

Hi Contad,

This has been an intense subject of discussion last couple months on this mailing list.......Ted has incorporated a system where you can use parameter in eCol to switch on and off a HID control board (about £5 on ebay) which then switches in and out the resistor. The big question is how does such a system compare to other methods such as offset frequency reference (eg using 1423MHz for the reference samples) or using another part of the SDR's spectrum as reference (if your bandwidth on your SDR is large enough)........

Andy

Sent from Outlook for Android

---

From: sara...@googlegroups.com <sara...@googlegroups.com> on behalf of Conrad Cardano <cardan...@gmail.com>
Sent: Sunday, December 28, 2025 2:31:33 PM
To: Society of Amateur Radio Astronomers <sara...@googlegroups.com>
Subject: [SARA] ezCol question

 

--
--
You received this message because you are subscribed to the Google
Groups "Society of Amateur Radio Astronomers" group.
To post to this group, send email to sara...@googlegroups.com
To unsubscribe from this group, send email to
sara-list-...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/sara-list?hl=en
---
You received this message because you are subscribed to the Google Groups "Society of Amateur Radio Astronomers" group.
To unsubscribe from this group and stop receiving emails from it, send an email to sara-list+...@googlegroups.com.
To view this discussion visit https://groups.google.com/d/msgid/sara-list/23907800-4947-471a-97a3-fe92cc1ecd9bn%40googlegroups.com.

[Conrad Cardano]

Thank you, Andy.

That was very helpful.

Conrad

[Alex P]

Again  :  See Attached PDF

[b alex pettit jr]

" Bandwidth "  :  I use 1.2 MHz with excellent results for IN BAND Correction 

( Cold Sky Normalization   CSN  )

[andrew....@googlemail.com]

Hi Conrad (or anyone else),

 

If you would like to try switching in a reference load using a HID switch on ezRA then either Ted or myself can walk you through the process – contact one of us directly – Ted, of course, is our resident expert but I have also been doing this myself and am happy to pass on (my little) knowledge to any interested parties, where I can.

 

Andy

To view this discussion visit https://groups.google.com/d/msgid/sara-list/40f20646-4c54-47e1-940f-54917e740879n%40googlegroups.com.

[Conrad Cardano]

I will try using the 1423 MHz reference for now.

Thanks a million.

To view this discussion visit https://groups.google.com/d/msgid/sara-list/002101dc781e%24139e5d90%243adb18b0%24%40googlemail.com.