[Hammarlund] HQ-215

[rbethman]

The real oddball thing is that the Tuning Units for the BC-610 will 
either use a crystal at its fundamental, the nest TU will use it, and be 
a doubler, while a third one will use the original crystal and will be a 
tripler.

IOW - The 3Mc TU will use the 3945Kc crystal in the fundamental freq., 
the 7Mc TU will use it and double it, and the one covering 12 Mc will 
triple it.

The oscillator circuitry has the 6V6 and 6L6 tubes to do the doubling 
and tripling, driving a pair of 807s that push the circuitry feeding the 
grid of the 250TH.

Bob - N0DGN

On 6/16/2010 2:19 PM, Bob Macklin wrote:
> Overtone crystals are always an ODD harmonic!
>
> Bob Macklin
> K5MYJ
> Seattle, Wa.
> "Real Radios Glow In The Dark"
> ----- Original Message -----
> From: "Dan Cotsirilos"<k9dtc at comcast.net>
> To:<hammarlund at qth.net>
> Sent: Wednesday, June 16, 2010 11:11 AM
> Subject: [Hammarlund] HQ-215
>
>
>    
>> Note of interest that maybe HQ-215 owners already know. Up until 12 mc the
>> HQ-215 uses the exact same crystals as the Collins S-line. I happen to
>> have a crystal pack and the crystal freq's are the same as the 215. After
>> 12 mc the Collins uses double overtone and the 215 uses triple.
>>
>> The filters are the same 1/2 the crystals are the same triple vs double is
>> a funny place to make a distinction?
>>
>>
>> Dan K9DTC