rock95seven

I have started testing on 800 khz using the Talking House am transmitter.

I have started testing on 800 khz using the Talking House am transmitter.

One serious problem with my particular model (TH 2) is the hum and low modulation. I am sure after spending some time digging around here on Part15.us a solution will be found to over-come these two problems.

The hum is probably the wall wart supplied with the TH and can be fixed by using a different power supply. Perhaps a regulated power supply.

Fixing the low modulation is my main concern and after tinkering with a few circuits I have come to the conclusion that a matching transformer is the only way to go. So far i have been experimenting with a graphic equalizer made by Teac. This has helped with controlling the tinny audio by limiting the highs and increasing the bass.
It is a shame that the digital audio storage chip has better modulation than the line input jack. The input jack sounds like about 50% modulation while the digital audio chip seems to transmit at or close to 80% modulation.

Hard to tell without a modulation meter but that is a educated guess none the less. So anyway, thats what i am up to these days.

Hope everyone is doing great.

p.s. testing may not be restricted to 800 khz but right now it seems there is less hum there.