7W Preamp

274 views
Skip to first unread message

Joey G. (Bonehead)

unread,
Jun 19, 2025, 8:08:18 PMJun 19
to Radioberry
I found this preamp from Turkey that seems promising.  Has anyone used one from this seller before?  I also bought their RX/TX/VSR board?  States 1-2 mW input will produce 7w output.

Joey G. (Bonehead)

unread,
Jun 19, 2025, 8:24:42 PMJun 19
to Radioberry
Here's a pic from the ebay listing.  

Screenshot 2025-06-19 192434.png

Wim Gmail

unread,
Jun 20, 2025, 2:32:38 AMJun 20
to Joey G. (Bonehead), Radioberry
Nice tip Joey.
I have buy it for my Red Pitaya project.
I am using now a irf510 pre amp. I am not happy with it.
Wim
PE1PWR
73s

Op 20 jun 2025, om 02:08, "Joey G. (Bonehead)" <jcgre...@gmail.com> schreef:

Joey G. (Bonehead)

unread,
Jun 20, 2025, 10:10:15 PMJun 20
to Radioberry
Quick follow up.  Received the amp today and it works just fine.  Initial testing shows it putting out over 10w.   I adjusted the PA calibration settings in pihpsdr for each band to keep it around 7w - 9w on a tune signal at 100 percent drive.   I had to turn most bands down quite a bit so my guess is this amp has high input sensitivity.   The final on it would get pretty hot quickly over 12w so I'm going to guess the rated max out at 9w is pretty accurite.  

Wim Gmail

unread,
Jun 21, 2025, 2:02:35 AMJun 21
to Joey G. (Bonehead), Radioberry
Nice information Joey.
Its right to adjust PA for every band.
Glad you find it. I let things now when I am received it.
Nice weekend
Wim
PE1PWR
73s

Op 21 jun 2025, om 04:10, "Joey G. (Bonehead)" <jcgre...@gmail.com> schreef:
--
You received this message because you are subscribed to the Google Groups "Radioberry" group.
To unsubscribe from this group and stop receiving emails from it, send an email to radioberry+...@googlegroups.com.
To view this discussion visit https://groups.google.com/d/msgid/radioberry/163b3146-6340-447e-8af2-d672ae047fb4n%40googlegroups.com.

Samuel Lourenço

unread,
Jun 21, 2025, 7:50:27 AMJun 21
to Wim Gmail, Joey G. (Bonehead), Radioberry
Here are my two cents. Instead of buying something of eBay that might or might not work, may I point you to some alternatives? These amplifiers are very linear, and they are made by a guy that is keen on doing a great job and very helpful. His store was recommended to me by another ham, that bough a different amplifier for other needs. You have several choices for Radioberry:

10 Watts: https://www.60dbm.com/product/10w-broadband-hf-1-55mhz-power-amplifier/
20 Watts (no much difference, perhaps differently tuned): https://www.60dbm.com/product/20w-broadband-hf-1-55mhz-power-amplifier/

I ended up buying the 10 W cased version, and it works like a charm. Very linear across the band. You will need to power it with 13.8 V, though, as 12 V is not enough, unless you wish to work with just 5 W (and you will have to attenuate the input signal further, or it will clip).

Kind regards, Samuel Lourenço


To view this discussion visit https://groups.google.com/d/msgid/radioberry/3ffb4a3a-b67e-4392-9918-735e0bdc5045%40gmail.com.

Joey G. (Bonehead)

unread,
Jun 21, 2025, 9:47:13 AMJun 21
to Radioberry
Thanks for the link Samuel.  I still need a LPF so will give the site a look to see what they have.  It's always nice to have more places to get parts.


73
Joe K5BHD

SNAIL

unread,
Jun 24, 2025, 3:35:17 PMJun 24
to Radioberry
I have LPF and BPF from 60dbm for my project. Exceptional quality, tuning tested and 100% as advertised. Looking to buy 100-watt amplifier for final.

Joey G.

unread,
Jun 24, 2025, 4:40:39 PMJun 24
to SNAIL, Radioberry
I did end up buying their LPF over the weekend.  Just waiting for shipping notification.  

To view this discussion visit https://groups.google.com/d/msgid/radioberry/d8e2e061-ecc4-4004-bd80-e363bb391a89n%40googlegroups.com.

Joey G. (Bonehead)

unread,
Jul 7, 2025, 10:43:53 PMJul 7
to Radioberry
@snail - I received the LPF and was curious how you are controlling it.  I'm using an arduino currently that copied the N2ADR HL2 board but are having some issues adapting it to this filter board as it only uses 4 output pins instead of 6 and also has separate input needs for bands where the N2ADR board combined some of the higher bands with the same filter.
Message has been deleted

SNAIL

unread,
Jul 11, 2025, 9:07:32 AMJul 11
to Radioberry
Joey I have made it working with MCP23017 board from Amazon. Let me know if you interested and i will guide you how to step by step. 

Joey G. (Bonehead)

unread,
Jul 17, 2025, 2:28:56 PMJul 17
to Radioberry
Thanks for the info.  I found a way to make my current setup with arduino work.  This code allows you to also adjust the outputs to anything you need using the OC.  Also supports PTT out, OLED display, Temp monitoring and fan control.  I'm using the code from EA3IGT.  I also added VWSR reading to it as well.  

Reply all
Reply to author
Forward
0 new messages