Here are a few useful related links. Some are external websites that Vortex has no control over.
The links are purely for reference and we have no commercial affiliation to any listed.
We also cannot vouch for their content or accuracy of that content.
Two popular logging
programs for the Radio Amatuer
and Short Wave Listener
The RSGB Islands on the Air
Program has be running since 1964.
It’s a lifetime passion for island chasing
Command Technologies HF2500 Amp
The HF2500 is a real classic HF Amp.
A solid workhorse from Pat Stein N8BRA
See Hamradio Market for the Review
HF2500 ‘Festoon Bulb’ Modification – November 2012
The original bulbs are very low wattage and only seem available in North America.
After about 12 months use, they blow. I replaced them with European 3w versions and came across issues.
See here what I did – But see 2013 update further down.
Commander HF2500 Resources
Download the Original Command Tech PDF Schematic Here (16Mb PDF File)
See the next generation amplifiers from Dedicated RF
LED Replacement for Festoon Bulbs
Festoon Bulbs 3w – Conrad Electronics
Download the Palstar Commander HF2500 PDF Schematic Here (6Mb PDF File)
*2013 UPDATE* HF2500 ‘More Bulb Problems’ G0UIH Modification
After 3 months of operating with only ’2 Festoon Bulbs’.
There is still an intermittant issue which seriously affects the amp’s operation.
See my LED Mod here which seemed to have finally solved all the problems.
Electronic Test Equipment from Circuit Specialists
For observing wave shape, with clear, easy to read LED screens plus unique features and functions compared to your average digital storage oscilloscope. Link here