Hello Victor
I believe the adjustable coils are on the older Henry amps. No inductors like
that on the 3K and 8K ultra two-piece amps
Carl
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From: Amps <amps-bounces@contesting.com> on behalf of Victor Rosenthal
<k2vco.vic@gmail.com>
Sent: Monday, December 11, 2023 11:38:15 AM
To: amps@contesting.com <amps@contesting.com>
Subject: Re: [Amps] Starting up a NEW Henry amp
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Carl,
I understand that the SWR as shown on the meter in the transceiver is
high when the amplifier is operating, but the SWR on the line to the
antenna is normal. Is that correct?
The Henry Ultra amps have pi-network input circuits for each band. They
have adjustable coils, L1-L6 on the schematic. If someone has
misadjusted them, you can see high SWR.
Does this happen on all bands or just some of them?
73,Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
CWops no. 5
http://www.qsl.net/k2vco/
On 11/12/2023 18:08, Carl Braun wrote:
> Hello John
>
> I am seeing high VSWR on my 7800 when using the Henry ULTRA amp. I don't
> hear or see RFI on my monitored signal but the VSWR meter is certainly
> responding differently to the Henry amp than it does to my Alpha amp. By
> engaging the tuner on the 7800 I can get MOST of the Henry's VSWR down to
> under 1.5 or so. Placing a W2FMI line isolator (1:1) in between the 7800 and
> the Henry did nothing to lessen the high VSWR I saw coming back at the
> transceiver. It should be noted that the RF console was approx. 3' from the
> transceiver at the time of testing with a 25' RG-58 exciter coa from the rig
> to the input of the amp.
>
> I've pulled my dummy load out of storage and am ready to test the amp with
> that. The antennas I have been using with the Henry are all flat at their
> respective frequencies. I see less than 1.3:1 at 1.5KW on my Powermaster II
> monitor, and on the 7800 VSWR meter, when using the Alpha. Palomar is
> sending over a couple of choke kits for the radio room and the antenna feeds.
> Choke kits for the TXCVR and AMP as well as 1:1 chokes for vertical antenna
> feed points. As one responder noted; Henry basically suggests you don't use
> the tuner in the TXCVR to knock down any VSWR. I plan on asking Dennis
> Pickering about the issue next time I have him on the phone.
>
> More experimenting later this week as I am currently wiring in a 240VAC feed
> on the opposite side of the radio room so I don't have to test the Henry
> consoles in close proximity of the operating position. More updates
> afterward.
>
> Carl W9LF
>
> -----Original Message-----
> From: Amps <amps-bounces@contesting.com> On Behalf Of john@kk9a.com
> Sent: Wednesday, December 6, 2023 9:43 PM
> To: amps@contesting.com
> Subject: Re: [Amps] Starting up a NEW Henry amp
>
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>
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> attachment nor links in the message.
>
> Are you saying that the Henry is causing RFI in your transceiver? Is this
> occurring with a dummy load or does you antenna feedline have CMC?
>
> John KK9A
>
>
>
> Carl Braun W9LF wrote?
>
> By enabling the tuner in the rig I can knock down most of the SWR when
> running the Henry's but I don't have to do that with my other amp. One
> difference... I do have a longer coax run (25') from the Henry's back to the
> PM II watt meter . The Alpha has a three ft (3') jumper from the amp to the
> watt meter. I'm going to shorten the coax from the Henry RF consoles to the
> coupler to 8' or so to see if that lessens any of the RF coming back to the
> rig. I do have a W2FMI line isolator in the line going to the amps with no
> visible changes. More parts are coming like RFI kits for the amp and
> transceiver, a 1:1 unun for the output of the amp and one for the base of the
> antenna.
> Any other Suggestions?
>
> Thanks
>
> Carl W9LF
>
>
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