RE HW 22 shift beteew receive vs xmit freq - HELP NEEDED

[Robert Groh]

Jerry,

First off, don't part it out!  You can scrap it out by sending it to me (!) but don't scrap it out. It is a bit frustrating but you should be able to dig around and figure it out.  

I don't have a schematic or block diagram for the HW-22 around but, assuming it is similar to the HW-32 in general design layout, you have 3 places that frequencies are generated:
#1    The VFO (5.0 to 5.5 MHz)
#2     The Carrier Oscillator (3.395 MHz + offset)
#3     The hetrodyne oscillator (xxx MHz)

The hetrodyne oscillator mixes with the VFO and the resultant is then mixed with the IF signal to produce the desired output frequency. 

One of those is possibly jumping in frequency - by the way, I think (given the frequencies you mentioned that the offset is 20 kHz not 200 kHz). 

If you can use your 'test receiver', you should be able to find the bad boy.  I would also suggest that you might make note of the character of the shifted output.  I rather suspect the 'bad' frequency will be a bit drifty, noisy, etc.

Give this stuff a try and then send on some more hints.  

73
Bob, WA2CKY 




________________________________
From: Jerry Rego <Jerry_Rego at COMCAST.NET>
To: HEATH at LISTS.TEMPE.GOV
Sent: Wednesday, May 27, 2009 7:01:16 AM
Subject: [HEATH-TEMPE] RE HW 22 shift beteew receive vs xmit freq - HELP NEEDED

I 
> have a HW 22 (not A version) that has a problem. It will receive on one frequency and transmit 
> 200KC higher than its receive freq. I.e. I receive one station on 7.2500 MZ and when I transmit it 
> will outout on 7.2.700 MHZ. This has been verified by on air stations I have contacted and by myself..  I transmitted on the HW 22 and receiving on my Kenwood 570D Xceiver,. the570D received 
> the HW 22  transmitter at 7.2.700MHZ a difference of 200KHZ. I have Trouble Shot this thing for a month and 
> have not made any headway. Could it be a leaking cap or an out of spec resistor ?  It 
> is in very good condition and hate to shelf it or part it out.  ON receive the HW22 receiver recives in accordance with the main freq dial  I.e.  I transmit with the 570D @ 72500 with an output power of 5 Watts and the HW 22 receiver tracks along within Heathkit specifications.  The groups' help, as in the past, is most 
> appreciated in solving this problem .

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