Just to check, on AM, I tuned it to a local station at 900 KHz.
I found the local oscillator on a digital radio at 1350 KHz.
I don’t know what it’s supposed to be.
I posted about this radio last week. A gentleman named Michael answered me. The radio is a Coronado 46 RA 85762A. The other numbers on the chassis are 6A85 113145. The dial is way off. 840 comes in at910 & 96.9 comes in at 95. He asked me about adamaged oscillator coil. It doesn’t show any signs of physical or heat damage. The trimmer on the tuning capacitor are within 1/2 turn of tight. Just to check, on AM, I tuned it to a local station at 900 KHz. I found the local oscillator on a digital
That would be a 450KHz IF, if the counter isn't loading
down the oscillator with its input capacitance.
On Sunday, March 1, 2020 at 3:56:03 PM UTC-5, Fox's Mercantile wrote:
On 3/1/20 2:07 PM, Michael Terrell wrote:
That would be a 450KHz IF, if the counter isn't loading
down the oscillator with its input capacitance.
That's the problem.
Realign the IF to 455 KHz.
That won't cause the dial to be of by 70KHz at that frequency.
On 3/1/20 2:07 PM, Michael Terrell wrote:
That would be a 450KHz IF, if the counter isn't loading
down the oscillator with its input capacitance.
That's the problem.
Realign the IF to 455 KHz.
On 3/1/20 3:15 PM, Michael Terrell wrote:
On Sunday, March 1, 2020 at 3:56:03 PM UTC-5, Fox's Mercantile wrote:
On 3/1/20 2:07 PM, Michael Terrell wrote:
That would be a 450KHz IF, if the counter isn't loading
down the oscillator with its input capacitance.
That's the problem.
Realign the IF to 455 KHz.
That won't cause the dial to be of by 70KHz at that frequency.
It will if you have to pad the LO to work 50 KHz off frequency at
the low end. The resulting LC ratio fucks up the tracking at the
high end.
He mentioned that the padders are both almost closed all the way.
(maximum capacitance).
The minimum to maximum values of the local oscillator tuning
capacitor is dependent on the IF frequency being correct.
On Sunday, March 1, 2020 at 4:25:01 PM UTC-5, Fox's Mercantile wrote:
On 3/1/20 3:15 PM, Michael Terrell wrote:
On Sunday, March 1, 2020 at 3:56:03 PM UTC-5, Fox's Mercantile wrote:
On 3/1/20 2:07 PM, Michael Terrell wrote:
That would be a 450KHz IF, if the counter isn't loading
down the oscillator with its input capacitance.
That's the problem.
Realign the IF to 455 KHz.
That won't cause the dial to be of by 70KHz at that frequency.
It will if you have to pad the LO to work 50 KHz off frequency at
the low end. The resulting LC ratio fucks up the tracking at the
high end.
He mentioned that the padders are both almost closed all the way.
(maximum capacitance).
The minimum to maximum values of the local oscillator tuning
capacitor is dependent on the IF frequency being correct.
1350KHz
-900KHz
-------
=450KHz not 400KHz
I posted about this radio last week. A gentleman named Michael answered
me. The radio is a Coronado 46 RA 85762A. The other numbers on the
chassis are 6A85 113145. The dial is way off. 840 comes in at910 & 96.9 comes in at 95. He asked me about a damaged oscillator coil. It doesn’t show any signs of physical or heat damage. The trimmer on the tuning capacitor are within 1/2 turn of tight. Just to check, on AM, I tuned it
to a local station at 900 KHz. I found the local oscillator on a digital radio at 1350 KHz. I don’t know what it’s supposed to be. Thanks for getting back to me so fast. Best Regards, Kurt
Sent from my iPad
I posted about this radio last week. A gentleman named Michael answered me. The radio is a Coronado 46 RA 85762A. The other numbers on the chassis are 6A85 113145. The dial is way off. 840 comes in at910 & 96.9 comes in at 95. He asked me about adamaged oscillator coil. It doesn’t show any signs of physical or heat damage. The trimmer on the tuning capacitor are within 1/2 turn of tight. Just to check, on AM, I tuned it to a local station at 900 KHz. I found the local oscillator on a digital
Sent from my iPad
On 3/1/20 3:15 PM, Michael Terrell wrote:
On Sunday, March 1, 2020 at 3:56:03 PM UTC-5, Fox's Mercantile wrote:
On 3/1/20 2:07 PM, Michael Terrell wrote:
That would be a 450KHz IF, if the counter isn't loading
down the oscillator with its input capacitance.
That's the problem.
Realign the IF to 455 KHz.
That won't cause the dial to be of by 70KHz at that frequency.
It will if you have to pad the LO to work 50 KHz off frequency at
the low end. The resulting LC ratio fucks up the tracking at the
high end.
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