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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment.

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Old 1st Sep 2013, 5:44 pm   #1
Davel831
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Join Date: Jul 2013
Location: St. Helens, Merseyside, UK.
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Default Lafayette HA-700. Help please.

Hi all
I am looking for somebody local to me to please have a look at my lafayette HA-700.

I think it needs realigning and the CW and SSB doesn't work brilliant?

Please anybody at all

Dave
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Old 1st Sep 2013, 7:26 pm   #2
g4aaw pete
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Location: Birchington Kent, UK.
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Default Re: Help please

Hello Dave

sorry, I'm rather a long way from you - Maidstone, Kent.

I've looked at the circuitry for the HA700 & believe it's very similar to the Trio 9R59 and it's many variants.

My impression of the Trio types is that they do indeed give rather poor performance on SSB/CW compared to more modern receivers.
Even though the design incorporates a product detector, I found it necessary to reduce the RF gain control to get good resolution for SSB transmissions.

If the BFO doesn't work at all, there is indeed a fault to be cured.
Perhaps you could give some more details as to how the HA700 fails to handle SSB/CW?

Regards
Pete
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Old 1st Sep 2013, 8:37 pm   #3
HamishBoxer
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Default Re: Help please

Do Not touch any alignment unless its already been got at.Poor performance may well be component ageing and out of spec.
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