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I'm getting close to doING the same on my SX-100. So I'm interested in knowing your outcome.What is the peak to peak measurement of your input signal and is it 50 ohm terminated? And, what about your

Guess this old dog is not too old to keep learning. Definitely not what my work background has been. Just always had an interest in radios and hate to see these beautiful receivers just go to a junk

The 150 filter is a little wider, a little better high frequency audio. It just sounds a little better. Walt Cates, WD0GOF https://wd0gof.com/Hallicrafters A majority of acceptance is not proof of

My SR400 schematic appears to indicate 1650 and 1652.8 kHz crystals.? FL1 is a 1650 6-pole filter. What is the advantage of changing? to the filter and frequencies from the SR150? -- 73/Rick W4XA

Certainly, you might not want to use a drill. Instead use a dremel tool and have a running shop vac hose next to the dremel to suck up all of the metal filings. Good Luck, dave wa3gin

Ok. I need to measure the one I have to make sure it will be a direct fit. Nervous about drilling the rivets. Don't have much of a choice I guess. C

Ok that makes more sense to me now. AGC was off. I will drop the output on the generator . Will use my scope to get it just registering, then move it over to the T1 input point. This Heathkit is not

Thanks Dan, I missed that one. ________________________________ Sent: Monday, April 1, 2024 8:44 PM To: [email protected] <[email protected]> Subject: Re: [HallicraftersRadios]

?Test point B is DC. Keeping the displayed voltage around 1 volt or so isn’t super critical during the 50.5 alignment but, in general, you usually want to keep the injected and observed voltages

Hello C, I don’t know anything about the rig, but with that cap riveted in, if you think that cap is shot but not certain, perhaps jump it somehow with a good cap of some reasonable value, and see

Hey, Take pics of the trimmer upgrade. Thanks, dave wa3gin

Came home and fired the rig up. let it run for an hour. Found a 10 to 15 W carrier on Both side bands. Attempted to NULL the carrier.? The POT works and did null it down to 3W. The Trimmer Cap only

You are getting DC and AC mixed. The 1 volt rms is the ac signal. The dc component (10 to 12 volts) is the dc bias developed by the detector diode tube. Go back to test point, set your meter on ac and

Apparently I only thought my alignment was successful. Think I either interpreted something wrong or there is something more going on. Inputting a 50.5kc signal at T1 on pin number 1 as directed in

Traced the keying line through the rig and the critical waveform behavior for the trailing edge is the cutoff of the crystal oscillator/mixer combo.? The drop onset of cutoff for the other stages was

The specs on the filter are rather embedded. The transmitter audio response for the 150 is 600Hz to 2800Hz. The transmitter audio response for the 400 and 2000 is 500Hz to 2400Hz. You can play around

Looks like not much would be needed. The Xtals are 1648.1 and 1651.7 in the SR150. I do not know the difference in the FL1. It does not say the bandwidth in the 150 manual or schematic. I suspect it

Thanks Walt, Much appreciated, I’ll have a read. Vy 73 Chris G1rpo

I have not seen any documentation on the swap-out. I also have not done the mod. I would imagine the mod to the 400 is pretty much plug and play the 150 and 400 use the same input and output tuning

Is there anything written on how to swap the FL1 and crystals? TNX - WS4AM