Anan 7000DLE MKII black 6 m LNA

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I2NOY
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Location: Milano - Italy

Anan 7000DLE MKII black 6 m LNA

Postby I2NOY » Mon Jul 12, 2021 3:46 pm

I fear my 6 m LNA is dead.
I was receiving 6 m band during a far thoundstorm and suddenly the receiver drop gain of about 40 dB.

Below pictures of today situation.

Setup LNA ON.jpg
Setup LNA ON.jpg (67.41 KiB) Viewed 4054 times
LNA ON.jpg
LNA ON.jpg (109.22 KiB) Viewed 4054 times
Setup LNA OFF.jpg
Setup LNA OFF.jpg (67.29 KiB) Viewed 4054 times
LNA OFF.jpg
LNA OFF.jpg (155.53 KiB) Viewed 4054 times

I think the LNA is dead.
When I switch in setup between the 6 m LNA ON and OFF, I hear a relé click everytime.

Where is located the 6 m LNA component? Someone has a picture of the board and location of it?

Just today I received the schematics. I think the component is U14 and/or U15 (PGA-103+) located on PA Filter board.

6m LNA.jpg
6m LNA.jpg (62.72 KiB) Viewed 4054 times


Do you suggest other tests to prove it is really defective?
Is it so sensitive? I have a 6 el. LFA yagi, so it is electrically in short circuit and the cable is connected to a linear amplifier, so not directly to Anan.

Many thanks for help. :)
Last edited by I2NOY on Tue Jul 13, 2021 9:01 am, edited 1 time in total.
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Tony EI7BMB
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Re: Anan 7000DLE MKII black 6 m LNA

Postby Tony EI7BMB » Mon Jul 12, 2021 4:23 pm

A few years ago I had the same situation where the 6m LNA just failed for no apparent reason on my Anan 100 . It was an SMD component which was replaced but did not fix the issue so the Anan 100 had to go back for service .

For some time i have been running without the LNA activated on my 7000 mk2 and i find very little difference in SNR so perhaps you might wait until 6m E's season is over before carrying out repairs.
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I2NOY
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Re: Anan 7000DLE MKII black 6 m LNA

Postby I2NOY » Mon Jul 12, 2021 7:05 pm

Many thanks Tony.
Normally I would not use pre on 6 m but for a mistake I cooked the pre near the antenna and so I switched ON the Anan one.
I will decide if I keep my RTX without a working pre on 6 m or I can try to repair the issue with a new component, checking if sourrounding capacitors, resistors and coils are ok.
It is a pitty as the RTX is only 2 months old.
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Tony EI7BMB
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Re: Anan 7000DLE MKII black 6 m LNA

Postby Tony EI7BMB » Mon Jul 12, 2021 7:26 pm

Sorry to hear its only new , mine failed after a few months also . I made up a temp pre amp with ha8et unit and coax relay but honestly i really did not need it as have QRN here.
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I2NOY
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Re: Anan 7000DLE MKII black 6 m LNA

Postby I2NOY » Tue Jul 13, 2021 8:35 am

I have a lot of noise too in Milano city :( but I have 48 m of coax cable and I lose about 2.5 dB if I don't use a pre.

I hope filter unit is easy to reach once I open the radio.

If I have time, during the WE I will try the repair. :mrgreen:


P.S.: as 7000DLE is a dual receiver, this evening I will try to see if 6m LNA of second receiver is working or not.
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I2NOY
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Re: Anan 7000DLE MKII black 6 m LNA

Postby I2NOY » Mon Jul 19, 2021 9:02 am

After some bad words :D , I was able to change U14 and now the RX1 6 m LNA is working properly.
I found the component case broken, like a short circuit on power supply inside it.
Not understanding why this happened.
It may be a defective component not enough seasoned. ;)
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Re: Anan 7000DLE MKII black 6 m LNA

Postby Tony EI7BMB » Mon Jul 19, 2021 10:14 am

Glad you got it fixed
w4bf
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Re: Anan 7000DLE MKII black 6 m LNA

Postby w4bf » Mon Nov 08, 2021 11:02 am

Please tell me the email you used to request schematics of the 7000. I've asked more than once to support@apache-labs.com and no reply, even to my spam box.

I have a 7000 received in Sept 2021.
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I2NOY
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Re: Anan 7000DLE MKII black 6 m LNA

Postby I2NOY » Wed Nov 17, 2021 4:16 pm

Hi, I requested the schematics 3 times to support and 2 times to aprakash@apache-labs.com. I received them from aprakash.
w4bf
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Re: Anan 7000DLE MKII black 6 m LNA

Postby w4bf » Wed Nov 17, 2021 4:36 pm

Thanks - will contact him with my request.

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