need DX-100 advice

[Larry Knapp]

Tom - Did these issues get solved and if so, what were the solutions?  Was just curious as I'm a
DX-100B owner.

Larry KC8JX

--- "TChesek at Epix.Net" <tchesek at EPIX.NET> wrote:

> I'm still in the process of repairing my bargain DX-100 and finally have RF coming out. On CW I
> measure 125-140 watts, depending on frequency, into my HM-2140/Cantenna. In the Phone mode I
> also measure approximately the same values, carrier...then when I talk into the microphone the
> power reading drops dramatically. If I whistle continually for 5 seconds or so the measured
> power will drop to around 30 watts. Additionally, regardless of the audio gain setting, the
> audio is distorted to the point of being unintelligent. It has the sound of audio that is
> overdriving an amplifier. The audio gain control setting does vary the output level but the
> distortion is the same regardless to the level setting. I am using an unamplified D-104 which I
> previously used with my DX-60 plus I tried the D-104 mic head that I use on my HW-100, so I know
> that the mic is not the problem. I am monitoring the audio through my RX-1 receiver. I swapped
> the 12AX7 and 12BY7 tubes in the audio chain with know good ones from other radios. They also
> test good on my Knight 600 emission tester. I don't have any 1625 subs but am looking for a
> better approach to finding the problem. I have a T-3 Signal Tracer and a IG-102 Signal generator
> that has a 400 hz audio signal. It's one thing to use these signals to track a problem through
> to a speaker but can I put either to use in this modulation transformer circuit? Ideas are
> appreciated. Thanks in advance.
> 
> 73,
> Tom K3TVC


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