# DigiRig Lite, UZ7HO Sound Modem and VARA-FM issues
**URL:** https://forum.digirig.net/t/digirig-lite-uz7ho-sound-modem-and-vara-fm-issues/4883
**Category:** Uncategorized
**Tags:** software-soundmodem, software-varafm, troubleshoot-ptt
**Created:** [November 27, 2024, 11:40am UTC](https://forum.digirig.net/t/digirig-lite-uz7ho-sound-modem-and-vara-fm-issues/4883 "2024-11-27T11:40:49Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@KB6HOH](https://forum.digirig.net/u/KB6HOH)
#### Post date: [November 27, 2024, 11:40am UTC](https://forum.digirig.net/t/digirig-lite-uz7ho-sound-modem-and-vara-fm-issues/4883/1 "2024-11-27T11:40:49Z")
Here’s my problem:
Testing on a Dell i5 Laptop running Wind10 pro.
Sound Modem recognizes the DigiRig Lite Interface.
PTT.DLL is in the same folder as Sound Modem.
PTT Port is set to “EXT”
Click on Advance PTT settings.
Will error out with either “NO PTT.DLL is not found” or
“No Advance settings found”
I have even put Sound Modem and the PTT.DLL file right on the Desktop screen, still no good.
I have a DigiRig Lite interface running VARA-FM and Sound Modem on my Winlink Gateway and NO issues there.
I bought 2 more recently and have tested on my Dell Desktop Primary PC and that works just fine.
Now regarding VARA-FM the only problem I have there is when the Radio goes into TX it locks up.
Radio I’m testing with is a Alinco DR-135T MKIII.
Radio is connected to a dummy Load Antenna.
I suspecting RFI into the USB Port is causing the lockup or noise on the USB line and I will then need the USB Isolator.
Any ideas.
```
Tnx de Steve KB6HOH
```
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### Author:  [@Constrainted](https://forum.digirig.net/u/Constrainted)
#### Post date: [November 27, 2024, 2:04pm UTC](https://forum.digirig.net/t/digirig-lite-uz7ho-sound-modem-and-vara-fm-issues/4883/3 "2024-11-27T14:04:36Z")
> [@KB6HOH](#):
>
> Radio is connected to a dummy Load Antenna.
The problem does sound like RFI. Ferrite beads on the USB and leadline. Moving the antenna far from the transceiver helped me have a stable setup for two years and counting.
73 Constrainted
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### Author:  [@Constrainted](https://forum.digirig.net/u/Constrainted)
#### Post date: [November 27, 2024, 2:09pm UTC](https://forum.digirig.net/t/digirig-lite-uz7ho-sound-modem-and-vara-fm-issues/4883/4 "2024-11-27T14:09:09Z")
OK, I now realize this is Digirig-lite, not Digirig mobile.
73 Constrainted
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### Author:  [@AG7GN](https://forum.digirig.net/u/AG7GN)
#### Post date: [November 27, 2024, 5:10pm UTC](https://forum.digirig.net/t/digirig-lite-uz7ho-sound-modem-and-vara-fm-issues/4883/5 "2024-11-27T17:10:57Z")
Regarding the “No PTT.dll is found” problem, try this (assumes you have the PTT.dll file in the same folder as the soundmodem program):
- Press the `Windows` key and `R` together to open the Run dialog box.
- Type `sysdm.cpl` and press Enter to launch System Properties.
- Move to the **Advanced** tab inside the System Properties window and click on **Settings** under **Performance**.
- Navigate to the **Data Execution Prevention** tab.
- There are 2 choices. The first is “Turn on DEP for essential Windows programs and services only”. If yours is set to this, there’s nothing you can do here to change that soundmodem.exe error.
- The second choice is “Turn on DEP for all programs and services except those I select:” If yours is set to this, you have 2 choices:
1. Leave that setting as-is, then:
- Click **Add…** and then browse to and select `C:\soundmodem\soundmodem.exe` (or wherever you installed `soundmodem.exe` and the `PTT-DLL` files).
- Click **Apply** , then **OK** and **OK** again to close all the dialog boxes.
2. Change the setting to "Turn on DEP for essential Windows programs and services only”.
- Restart `soundmodem.exe`. PTT EXT should work now.
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### Author:  [@KB6HOH](https://forum.digirig.net/u/KB6HOH)
#### Post date: [November 28, 2024, 1:12am UTC](https://forum.digirig.net/t/digirig-lite-uz7ho-sound-modem-and-vara-fm-issues/4883/6 "2024-11-28T01:12:17Z")
Steve, Steve here also. Tnx so much for that info. It works!
I will file this info with my other DigiRig Mobile and DigiRig Lite files.
Tnx again. 73 de Steve KB6HOH
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### Author:  [@AG7GN](https://forum.digirig.net/u/AG7GN)
#### Post date: [November 28, 2024, 6:24pm UTC](https://forum.digirig.net/t/digirig-lite-uz7ho-sound-modem-and-vara-fm-issues/4883/7 "2024-11-28T18:24:53Z")
You’re welcome, Steve.