G4BAO driver amps for 23 and 70cm available again

Items for sale here please
Forum rules
This forum is run by the BATC (British Amateur Television Club), it is service made freely available to all interested parties, please do not abuse this privilege.

Adverts will be archived when the seller indicates that the item is sold or after one year. If you wish to keep advertising after one year, please re-post.

Thank you
Post Reply
Posts: 22
Joined: Fri Jan 12, 2018 1:14 pm

G4BAO driver amps for 23 and 70cm available again

Post by g4bao » Wed Jun 29, 2022 2:00 pm

The LDMOS device PD85004 as used in my 70 and 23cm 3W driver board kits is now obsolete and no stock has been available anywhere for around 2 years.

I now have around 15 devices remaining so order the 23cm boards while you can. Ordering details and price unchanged from 2019, but note I am only accepting Paypal payments and only shipping to the UK.

I have a working design for 70cm using an alternative device in the same package, with just a few minor changes to the design.
The new device is just not capable of operating at 23cm with any significant gain or output power, and have been unable to find a suitable replacement, so that design is now officially withdrawn and unavailable.
Once I have exhausted the PCBs for the 70cm kit that will also be "retired"

I will put the kit info on Github with my other "retired" designs in due course. The new device has slightly lower gain than the old device at 70cm, requiring around +14dBm (without the 3dB input attenuator) to produce 3 Watts Psat.

Post Reply

Return to “For Sale”