I also have PM-3A and PM-2A. I recall reading somewhere in Ten-Tec
instructions, many years ago, that the extra loading caused the TX to shift
enough for offset. Also, the need to tune down on high side.
Sent from my iPhone
> On May 3, 2017, at 8:27 AM, Steve Ellington <steven4lq@gmail.com> wrote:
>
> Mike: Thanks for the HW-8 info. I looked at the HW-8 schematic and they
> shift the VFO via a diode/capacitor triggered by the relay voltage. That's
> perfect for the Power Mite. I'll give it a try. The HW-7 is like the
> PM...No cw offset. This reminds me of the National NCX-3 I tried many years
> ago. No offset or RIT made it almost impossible to use. 73 Steve n4LQ
>
>> On Tue, May 2, 2017 at 11:39 PM, Mike Bryce <prosolar@sssnet.com> wrote:
>>
>> On the HW-8, a direct conversion transceiver, heath instructed the
>> operator to tune from the high side down. In other words start at 7.1 and
>> tune lower in freq, keeping the receiver on the high side of the bandwidth.
>>
>> that way when a station answered, it would be on the low side, but
>> completely copyable.
>>
>> There was a slight offset between tx/rx because heath allowed the VFO to
>> shift a bit in tx. The actual shift depends on the band
>>
>>
>> Mike, WB8VGE
>> SunLight Energy Systems
>> The Heathkit Shop
>> http://www.theheathkitshop.com/
>> J e e p
>> o|||||||o
>>
>>> On May 2, 2017, at 11:21 PM, Steve Berg <wa9jml@frontier.com> wrote:
>>>
>>> This sounds a lot like my Heath HW-7. It has a bit of an offset, but
>> not much of one. It is also a direct conversion rig.
>>>
>>> Steve WA9JML
>>>
>>>
>>>> On 5/2/2017 7:30 PM, Steve Ellington wrote:
>>>> I'm playing with a PM3A and noticed there is no CW offset. There's
>> nothing
>>>> mentioned in the "manual" and the VFO has no means of shifting frequency
>>>> when the key is down. This is a mystery since without this feature,
>> anyone
>>>> coming back to my CQ will be zero beat and couldn't be heard. I have
>> done
>>>> some Googling. Offset and Powermite don't seem to be used together.
>>>> I guess I could rig up a varicap to do the the job. Does anyone have any
>>>> experience with this rig?
>>>> Note: I am not using crystals nor does it have any xtal jack. I'm using
>> the
>>>> same VFO for xmt and rx.
>>>>
>>>> Shiftless in Charlotte
>>>>
>>>> Steve N4LQ
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>>>>
>>>
>>>
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>>
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