Total posts : 45366
I own the Ramsey AM25 transmitter and am very happy with it.
Power out it between 100 mw and 2 watts using a 15 volt supply.
Audio is great and it it a PLL circuit so it is stable like a rock.
Although this transmitter has had it share of complaints, there are a few simple things you can do to improve its performance.
1. The Jameco power supply supplied with the AM25 is JUNK!!!!!
Replace it with a switching supply like the PS-151 from allelectronics.com
Its $12 and even has the proper end to match the AM25.
With this supply all hum will vanish and the transmitter runs like a champ into a 50 ohm load even at the 1 watt level.
I show a healthy 1+ watt output with good audio on a Oakhills QRP watt meter!
2.If you run the transmitter at the 1 watt+ power level you MUST use a fan to blow air over the board.
With a miniature 12 volt fan from All Electronics the unit runs cool to the touch.
For $3 you will save your transmitter!
With these fixes the AM25 is a great little unit.
Big bang for the buck!!!
Bill
