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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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1st Sep 2013, 5:44 pm | #1 |
Diode
Join Date: Jul 2013
Location: St. Helens, Merseyside, UK.
Posts: 4
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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 |
1st Sep 2013, 7:26 pm | #2 |
Heptode
Join Date: Jan 2008
Location: Birchington Kent, UK.
Posts: 595
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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 |
1st Sep 2013, 8:37 pm | #3 |
Dekatron
Join Date: Aug 2007
Location: W.Butterwick, near Doncaster UK.
Posts: 8,923
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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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