The ability to see a visual representation of the AGC-T level within the context of the current noise floor and signal levels, greatly aids in the understanding and adjustment of AGC-T.
I think this would be a great asset to SmartSDR
73, Dale
WA8SRA
- 7 Posts
- 0 Reply Likes
Posted 5 years ago
- 638 Posts
- 89 Reply Likes
- 484 Posts
- 78 Reply Likes
- 1862 Posts
- 679 Reply Likes
Do you have a snapshot of what this looks like?
I added an idea a few weeks ago to put the AGC-T numeric value on the panadapter bar. Maybe a combination of the two would be worth considering. Some like graphical representations and others like numbers, so having both covers all the bases. Here is a link to the idea I referenced:
https://community.flexradio.com/flexradio/topics/add_preamp_and_agc_status_to_the_panadapter_bar
Regards, Al / NN4ZZ
al (at) nn4zz (dot) com
- 7 Posts
- 0 Reply Likes
Here are a couple of screenshots:
From cuSDR64 console:
< http://www.hamsdr.com/personaldirectory.aspx?id=3505 >
From OpenHPSDR PowerSDR mRX PS console:
< http://www.hamsdr.com/personaldirectory.aspx?id=3506 >
73, Dale
WA8SRA
- 1862 Posts
- 679 Reply Likes
I combined both ideas and made a mockup using the SSDR screen. Does this capture it correctly? I also updated the other idea since I don't know of any good way to combine them for the vote total.
Regards, Al / NN4ZZ
al (at) nn4zz (dot) com
CLICK to view full size......

- 4239 Posts
- 1352 Reply Likes
Perhaps an alternative could be a change in color on the slice/filter strip that does the same thing? Or some variation on the theme? (A tic mark on the slice, a partial line that crosses the slice/RX filter strip for an inch or so each direction, a tic-mark with a color change below it....)
I am not sure that I would need a line all the way across the screen because the AGC-T only affects what is happening within my RX filter bandwidth.
- 152 Posts
- 20 Reply Likes
I like the idea's about lines. I have already asked before the possibility of marker lines for measurements. https://community.flexradio.com/flexradio/topics/marker_lines
- 1862 Posts
- 679 Reply Likes
Here is another option.....also posted in the other idea.
Regards, Al / NN4ZZ
al (at) nn4zz (dot) com

- 1862 Posts
- 679 Reply Likes
Or if some folks like the numbers being visible all the time there could be a fade option.
- 1 second
- 5 seconds
- never
We know the developers like providing options....;-)
Regards, Al / NN4ZZ
al (at) nn4zz (dot) com
- 7 Posts
- 0 Reply Likes
- 473 Posts
- 119 Reply Likes
- 1862 Posts
- 679 Reply Likes
Maybe show both values. I'm guessing that the number from the slider position could remain constant and the actual signal level could vary based on conditions. The slider number is basically a value of 0 - 100% of the available adjustment. Does that makes sense?
- left of the line in the border show both (44 and -98dbm)
- when hovering on the slider show the slider percentage (44)
So here is another mockup.....
Regards, Al / NN4ZZ
al (at) nn4zz (dot) com
CLICK to see full size....

- 147 Posts
- 17 Reply Likes
Hi All,
Like everyone else, I have been interminably confused by the meaning of the AGC-T slider on PowerSDR. It does function somewhat like an RF Gain control on other radios. Today I sat down and fed my Flex-1500 audio through VAC and into a PC Oscilloscope, and I finally have the facts, at least for the Flex-1500.
First off, when AGC is engaged (i.e. not Fixed) the output is limited to around -3 dBFS. Fixed AGC allows the level to go beyond and into clipping if a strong enough signal is being received.
Secondly, I found the following relation at AGC Slope = 0:
Knee[dBm] = -10 - Preamp - AGCT
So for example, when AGC-T is set to 70, the knee of the gain curve is at -80 dBm when the Preamp gain = 0. For Preamp gain = 10 dB, the knee goes to -90 dBm, and so on.
I haven't checked the Flex-3000 yet, and I don't know about the Signature Series.
- 73 de Dave, N7AIG
Tim - W4TME, Customer Experience Manager
- 9200 Posts
- 3561 Reply Likes
Related Categories
-
SmartSDR for Windows
- 5333 Conversations
- 1639 Followers
-
FLEX-6700 Signature Series SDR
- 3132 Conversations
- 644 Followers
-
FLEX-6500 Signature Series SDR
- 3674 Conversations
- 953 Followers
-
FLEX-6700R Signature Series SDR
- 891 Conversations
- 150 Followers
-
FLEX-6300 Signature Series SDR
- 3033 Conversations
- 869 Followers