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amend 2023-08-09

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Peter 2023-08-09 20:43:48 +08:00
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_posts/2023-08-09-Aliexpress-DC-block-characterization.md
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@ -6,7 +6,7 @@ categories: [Electronics] # Blogging | Electronics | Programming | Mechanical
tags: [rf, microwave, electronics] # systems | embedded | rf | microwave | electronics | solidworks | automation tags: [rf, microwave, electronics] # systems | embedded | rf | microwave | electronics | solidworks | automation
--- ---
I recently purchased [this DC block](https://www.aliexpress.com/item/1005002575850555.html) from Aliexpress to protect our HP 8560A spectrum analyzer. I did some basic tests on the DC block and it looks alright. I recently purchased [this DC block](https://www.aliexpress.com/item/1005002575850555.html) from Aliexpress to protect our HP 8560A spectrum analyzer. I did some basic tests on the DC block and it looks good for the price. These N type DC blocks seem to be less common and twice as expensive than the SMA type, but I wanted to avoid using SMA hardware for my setup.
![DC block](/assets/img/2023-08-09-Aliexpress-DC-block/IMG20230809195538.jpg) ![DC block](/assets/img/2023-08-09-Aliexpress-DC-block/IMG20230809195538.jpg)
@ -18,4 +18,4 @@ The DC block performs well over the 1 MHz to 2.9 GHz frequency range. At 2.45 GH
![Performance near 0 Hz](/assets/img/2023-08-09-Aliexpress-DC-block/IMG20230809200758.jpg) ![Performance near 0 Hz](/assets/img/2023-08-09-Aliexpress-DC-block/IMG20230809200758.jpg)
The -3 dB cutoff point is at ~850 kHz. The figure shows the performance from 300 kHz to 2 MHz (Note that the minimum frequency of the HP 8560A tracking generator is 300 kHz). So if you are using this block above 1 MHz, you should be fine. The -3 dB cutoff point is at ~850 kHz. The figure shows the performance from 300 kHz to 2 MHz (Note that the minimum frequency of the HP 8560A tracking generator is 300 kHz). So if you are using this block above 3 MHz, you should be fine.