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linear amp also see in files
My latest 2.4GHz amplifier project using a pallet from bisonelectronics-sp2iyr on Ebay and modified to give 75-80W from a 28 volt supply at 15 amps max and a max drive level of 250mW.
P1dB is around 50-60W at about 31dB gain
(conversion details will be in the next issue of CQ-TV and I will post the article as a file on this site)
Heatsink is PS200/250 from GD Rectifiers
Box is Hammond 1550J (275x175x67)
I used the original semi rigid cables as I had some although I convert most pallets to take SMA so you would still need to make up semi rigid RG-402 cables so as not to put too much load on the SMA sockets. |
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Pallets available for sale
I have a few of these pallets with?2x BLF8G22LS-160B
if you want one/some then email me?thebigclunk@... I have decided to go back to using the pallets with three of the same devices as they give me less problems I will supply some power connector pins with them. |
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150 watt 23cms linear amplifier for sale by G7NTG
This is a W6PQL based 150 watt linear amplifier with 2 stages of driver amplifiers , primarily intended for DATV but will be ok for all modes.
It has high gain, needing only 20mW for full power.? 55dB gain 28 volt 14 amps max. I am asking ?400 + postage (?30 with full insurance to UK) don't reply here because I don't monitor very often - email me at thebigclunk@... |
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PSU
Hi Jim
May I suggest telling the group that Andy G4JNT ran two Design Notes in Radcom on buck and boost converters. Jan and Feb 2017. In the Feb edition page 36,? he aimed at producing a boost converter with robust filtering to power his G4BAO 45W 23cm amp. It looks pretty successful and tailor made to your amp kit. Circuit diagram is on page 36.
Do you have a copy to hand? I wonder if one of the group members would make some PCB's?
I've almost all the parts except the boost converter to hand.
?
best wishes
?
David Holman M0YDH
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More PCB's?
A lot of people tried to contact me about the 23cms PA partial kits but did not email me direct as I requested so I did not see their requests.
It might be possible to order another batch of PCB's so that commercially available transistors can be used (about ?35.00GBP from Farnell,Digikey and Mouser)
IF YOU ARE INTERESTED IN PCB ONLY THEN EMAIL ME DIRECT AT thebigclunk@...
DO NOT REPLY TO ME HERE AS I DON'T MONITOR |
James Smith
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