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Re crystaling an HT220

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smorris

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Hello everyone! I have an HT220 which I bought at a yard sale a few years back. its been sitting on my desk as s show piece. I would like to get crystals for it and use it on the ham bands. I know where I can get crystals for it just now how to actually remove the old ones and install the new ones. Do they just come out with needle nose pliars or do i need to do some soldering? Is this going to be a big project?

Thanks
Steve
WX3PMC
 

jaspence

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Crystals

Unless you can find used crystals, you are up against an expensive project, probably much more than the radio is worth. International Crystals, one of the best known,just announced it is going out of business, and the last time I checked on ordering for an older radio, the cost was more than a new synthesised dual band HT.
 

RFI-EMI-GUY

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Hello everyone! I have an HT220 which I bought at a yard sale a few years back. its been sitting on my desk as s show piece. I would like to get crystals for it and use it on the ham bands. I know where I can get crystals for it just now how to actually remove the old ones and install the new ones. Do they just come out with needle nose pliars or do i need to do some soldering? Is this going to be a big project?

Thanks
Steve
WX3PMC
The crystals are soldered in so some bit of soldering skill is required. Also these radios require some tuning, so you need the manual. You can probably get crystals from one of the other few vendors if ICM can't take one last order.

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The crystals are soldered in so some bit of soldering skill is required. Also these radios require some tuning, so you need the manual. You can probably get crystals from one of the other few vendors if ICM can't take one last order.

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Jan is one of the only vendors who will still take orders.


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RFI-EMI-GUY

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When changing frequencies in an HT220, you may also need to change the 2nd , oscillator frequency to avoid some spurious responses. That and the fact that the antenna impedence is odd, requiring a 50 ohm tune up adaptor, make these unique to tune.. Portable Clinic in Ocala Florida may be a good resource. These radios can be easily refurbished and it would be simple to rig up a lithium Ion battery to power it.

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cmdrwill

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HT220 is really a fantastic portable. But no one is making good crystals for them anymore.
(in the US).

And every bit of RFI-EMI-GUY's post above IS true, been there did that.
 
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When changing frequencies in an HT220, you may also need to change the 2nd , oscillator frequency to avoid some spurious responses. That and the fact that the antenna impedence is odd, requiring a 50 ohm tune up adaptor, make these unique to tune.. Portable Clinic in Ocala Florida may be a good resource. These radios can be easily refurbished and it would be simple to rig up a lithium Ion battery to power it.

Sent from my SM-T350 using Tapatalk


I want to remember hearing something about the antenna impedance being 39 Ω.


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RFI-EMI-GUY

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I want to remember hearing something about the antenna impedance being 39 Ω.


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I used to have all the widgets and tools to service these things including the UHF and VHF impedance adapters. I had a small collection of HT220 and HT100 stuff. I finally gave all away to another enthusiastic collector of those artifacts. I was refurbishing them from discarded (plan X) frames and buying new plastic and knobs cheap from NPD. I only had one that I could not tame the receiver. The engineers told me to 'sprinkle the board lightly with 30PF capacitors".(WTF Over?) Finally I discovered a broken ground connection.

I knew an engineer from the HT220 design team. He told me that if they had to design that radio all over again they could not do it because it was such a finely engineered design with unique parts and parameters.
 

RFI-EMI-GUY

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Was anyone aware that there was a digitally encrypted HT220? It had CVSD and BCD selection of encryption code. I had the manual for this item. Never saw one though.
 

radioman2001

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The antenna impedance is 72 ohm, that's the reason for the tune up box for RX and TX. I never had to replace a second osc crystal unless they went bad. I still have a few display units including a Vietnam era VHF(139mhz) slimline with PL Military Police model which is all black including the frame which is anodized. A few Converta-Comm units on VHF and UHF.
 

RFI-EMI-GUY

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The antenna impedance is 72 ohm, that's the reason for the tune up box for RX and TX. I never had to replace a second osc crystal unless they went bad. I still have a few display units including a Vietnam era VHF(139mhz) slimline with PL Military Police model which is all black including the frame which is anodized. A few Converta-Comm units on VHF and UHF.

That's probably the correct RF impedance. The speaker is 39 ohms if I recall. The second oscillator change is only to shift from lower to high side injection to avoid some "birdies".
 
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