Good sources of information include: http://pa0fri.home.xs4all.nl/Lineairs/TL922/tl-922eng.htm and: http://www.vk2fc.com/tl-922mods/ Mike G8TIC _______________________________________________ Amps ma
I find myself looking for the [Like] button to click ;-) _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
Mike, There is the Geoff Brown GJ4ICD design: http://www.gare.co.uk/gj4icd_8877_amplifier.htm also on Chris' web site. I built one of these about 12 years ago and it has given excellent service. The
I have a pair of these RFP 3-500Z matched tubes in my TL922 and the work great. They are Chinese but the quality of Chinese tubes these days is pretty good. I also have a single one in my 6m amp (the
Vic, In the UK the AC supply is single phase 230V AC (was 240V AC until we re-aligned with the rest of Europe), there are three wires: Live (Phase) => 230 VAC Neutral (Return) => 0V ref Live Earth (S
All, I have been given a TE Systems 420-450MHz 180W amplifier that is faulty. Does anyone have the circuit/schematic so I can have an attempt at fixing it? Regards Mike G8TIC ________________________
Eltek 'rectifiers' do appear to work well but they are designed for charging 48V (4 x 12V) battery banks at typically 53-57V and may not have the regulation you would expect. I am using Meanwell/Sunp
Paul, If you're building an SSPA for 6m or 2m then also consider the F1JRD designs using the MRFE6VP61K25H - its rated at lightly more power than the MRF6VP11KH and is more robust. See www.rfham.com
SD1477 or MRF247 from recollection, often arranged with 5 devices one as a driver and 4 in the output - Wilkinson combined. Mike G8TIC _______________________________________________ Amps mailing lis
Hi, Firstly I suggest that you look at the G3WOS and GJ4ICD amplifier designs both use a 8877 on 6m - these will get you in the right ball park for anode tune (30pF vacuum variable), the main inducto
... forgot to say ... having removed the tube you are testing the output tank in the RF deck "cold" - no supplies (no HT, no bias, no supplies) _______________________________________________ Amps ma
Why would you want to build a 50V 50A 2500W supply (other than for the challenge) when you can buy a HP supply on Ebay for $30-40... just put "HP 48V 3000W" in to your ebay search ;-) Now, this would
I haven't tested one myself yet but have a friend in the HP server repair trade that has just acquired three for me... there's a thread over here: http://endless-sphere.com/forums/viewtopic.php?f=7&t
Can I suggest the following hearsink options for SSPAs: 1. Copper spreader plates can be obtained from Bert, PE1RKI, for example: http://members.chello.nl/b.modderman/MRFE6VP61K25HR5.html that's both
Conrad, Perhaps your email client is sending a HTML version *only* when the MIME spec. says that HTML may accompany a plain text version - if you're sending HTML only and the list server strips the H
Paul, They look good for a single module, you can probably fit 2 x 80x80mm fans to one edge and blow them. I'm looking for bigger heatsinks for a pair of modules ;-) Mike G8TIC ______________________
As I think I've suggested before, try this: Remove the tube, remove the supplies, connect a 220R from the tube anode to ground to simulate RL - assuming you're working at around 3100V on load and exp
Personally, I'd put the higher HT on the '1000 - you'll get a bit more power out with a bit less anode current and you'll less likely dip in to screen current on he negative-going half of the RF cycl
Have had a look at the board - looks okay, but general observations and recommendations from building several on 50/70/144MHz: * I can't see where the fixing holes are on the PCB? * you need a precis
Its not the smoke that gets out... its the light - the little blue flash - that you need to put back inside ;-) Mike G8TIC _______________________________________________ Amps mailing list Amps@conte