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looking for MH-10 Crystal formula

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KF5YDR

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Based on the callsign I assume he's looking to use them on the 6m ham band.
 

impalass427

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According to the manual I have, it's Carrier freq minus 0.455mhz divided by 5. Example: 42.96Mhz-0.455= 42.505 divided by 5 = 8.501 Mhz actual crystal freq. Don S
 

autovon

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Oh wow. Some oldies for sure. I picked up a bucket of these about 15 years ago at a swap meet for $20. Some were ex Milwaukee FD. A few were low band and marked for some rural FDs in Wisconsin.
Good luck OP!
 

KF5YDR

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The MH-10 is the Handicom, right? I read somewhere that it was basically an HT200 without the PA to cut costs.
 

cmdrwill

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The MH-10 is the Handicom, right? I read somewhere that it was basically an HT200 without the PA to cut costs.
NO the Handicom was the low end handheld and came out much later than the HT200. Not even close, a totally different design, it is a one board hh radio.
 

ramal121

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Lowband MH-10? Jeez that's a little before my time although I've had my hands on them.

The receive formula given, it's only a single conversion receiver at 455KHz? Boy that's cheesy. Maybe low band can get away with it. I could guess at the transmit multiplier but my luck would be wrong.

Anyway I see service manuals on everybody's favorite flea market for those things still. If you are dedicated to re-crystalling those things up, longtime rock companies will still have the formulas and specs to grind you a pair, just give them the freqs (Jan, International).
 

com501

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Last time I checked, ICM had a turnaround of about 14 days for those rocks, and they would gladly share the formula with you, including the series capacitance or inductance if it is part of the circuit equation.
 

impalass427

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Ronen, I only have a 25 year old copy of some of the pages from the manual, but not a full schematic. The Tx crystal formula is carrier freq divided by 3. From the transmitter circuit theory page: "The oscillator- modulator tripler stage generates the carrier frequency by tripling the fundamental frequency ( 10.000Mhz to 16.666Mhz) of the Tx crystal". Sorry I omitted this in my first post. BTW, I have a few of these low band Handie-Coms (MH-10) in my collection. Don S
 
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KF5YDR

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Handie-Com! I thought I was losing my mind, I just had the spelling wrong.
 
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