# 1.3 GHz FETProbe, V2

1.3 GHz active scope probe with FET input

- **Seller:** [Makerprobe's store](https://lectronz.com/stores/makerprobe), Hamburg, Hamburg, Germany
- **Price:** €28.00 (EUR, before shipping and taxes)
- **Availability:** In stock
- **Categories:** Test equipment, Tools
- **HS code:** 903033
- **Product page:** https://lectronz.com/products/-1-3-ghz-fetprobe-v2

## Options

**Accessories**

- No cables
- 2 x u.Fl to SMA jack (female) pigtail, 150 mm (6 inch) [Add €8.00] (14 left)
- USB to SMA power supply dongle [Add €5.00] (20 left)
- 2 x u.Fl to SMA pigtail AND 1 x power supply dongle [Add €12.00] (5 left)

## Links

- [Documentation](https://hackaday.io/project/184924-diy-13-ghz-fet-probe)

## Images

![1.3 GHz FETProbe, V2](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6MjQzNTgsInB1ciI6ImJsb2JfaWQifX0=--b627733daa2af7f005ad789ac50240c75aee929b/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJwbmciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--605f1da017bcbb03ce31845cd0e81d97e3b3c574/product_main_image_no-extra.png)
![1.3 GHz FETProbe, V2](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6MTMzMDEsInB1ciI6ImJsb2JfaWQifX0=--6235491015b37fa8acb8afad7b4cc9637b7113f8/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/20240407_000604_mod.jpg)
![1.3 GHz FETProbe, V2](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6MTMyNzYsInB1ciI6ImJsb2JfaWQifX0=--3d813e5714d3a274da5e1a54fa4ab8e752f41000/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJwbmciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--605f1da017bcbb03ce31845cd0e81d97e3b3c574/product_VNA_image.png)
![1.3 GHz FETProbe, V2](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6MTMzMDYsInB1ciI6ImJsb2JfaWQifX0=--c72a1918eb00fd5ea097d036083951bd35218850/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/20240406_230618.jpg)
![1.3 GHz FETProbe, V2](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6MTMyODQsInB1ciI6ImJsb2JfaWQifX0=--219c8a31c01ac0e4b4930ea7bd61099da61229e8/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/20230906_232312.jpg)
![1.3 GHz FETProbe, V2](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6MTMyODgsInB1ciI6ImJsb2JfaWQifX0=--54915444fd0e95d4bb8384620ab88c87e75c2abe/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/3842391667424776461.jpg)
![1.3 GHz FETProbe, V2](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6MTMyOTIsInB1ciI6ImJsb2JfaWQifX0=--c4ec1da7b49c2face35b864f15198ba5586337b6/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGVnIiwicmVzaXplX3RvX2xpbWl0IjpbOTYwLDY0MF0sInNhdmVyIjp7InN0cmlwIjp0cnVlfX0sInB1ciI6InZhcmlhdGlvbiJ9fQ==--4e27bac8cdfb621fb828f6a3a5982fe1a423b516/9849441667425386356.jpeg)

## Description

A 1.3 GHz active scope Probe with FET input and very low input capacitance (about 0.3 pF)  

- **AC coupled**
- minimum frequency: 100 kHz 
- attenuation: 1:10 (1:20 with 50 Ohm termination)
- supply: 5 - 16 V through u.Fl
- reverse voltage protection
- output through u.Fl
- can be soldered directly to the device under test for minimal lead capacitance

For powering, see our [USB to SMA dongle](https://lectronz.com/products/usb-5v-to-sma-dongle) **also available as an accessory option on this page** 

This is a nice low-cost addition to your scope accessory arsenal for cases when the stock probes of a cheap oscilloscope just can't do the job.

#### Why did you make it?
I made this probe to measure oscillators with low load capacitance, when my stock oscilloscope probes would probably detune the circuit too much. There are more use cases - basically everything that can be done with an AC coupled probe with low input capacitance.

See here for a little example: 
[https://hackaday.io/project/184924-diy-13-ghz-fet-probe/log/213125-measuring-an-sx1280s-oscillator-frequency](https://hackaday.io/project/184924-diy-13-ghz-fet-probe/log/213125-measuring-an-sx1280s-oscillator-frequency)