[Boatanchors] HQ-180 bandwidth

Sat Sep 26 22:28:37 EDT 2009

I was curious and just tried placing the carrier on both slopes of the passband in the 3 Khz. "Both" setting and got the same result as Carl.  You might be able to improve the operation in this setting by realigning the 455 Khz. IF section for this offset operation but then you would compromise other operation of the set.

I remain convinced the HQ-170/180 receivers are excellent "battle conditions" receivers but unless modified they are not going to offer wideband audio for those times when you can use it.  My operation on AM (both nets and roundtables) almost always involves one or more stations who are going to be difficult copy and my preference is to have a receiver that does well under poor conditions.  I have an HQ-180 paired up with a Valiant and an HQ-170A paired with a Pacemaker/Thunderbolt and those are both combos I like and use quite a bit.  My SX-88 does pretty well under both good and bad conditions as does my TMC GPR-90/Hammarlund HC-10 combo.  I just recently picked up a Watkins Johnson 8716 receiver and it seems to be very good under all conditions.  I don't have enough time with it yet but so far I am very pleased and in the ISB (independent sideband) position the separate sidebands are sent out as a separate stereo pair.  With the stereo phones on it is pretty amazing how clean one sideband often is under bad conditions and shows the value of a good selectable sideband receiver like the HQ-170.

Rodger WQ9E

-----Original Message-----
From: boatanchors-bounces at mailman.qth.net on behalf of Carl
Sent: Sat 9/26/2009 8:40 PM
To: Gary Schafer; 'Joe Roth-WC4R'; boatanchors at mailman.qth.net
Subject: Re: [Boatanchors] HQ-180 bandwidth

3 x 2 = 6
5 x 1 = 5

If you detune in the Both position it sounds like boviine excrement. I have 
a HQ-180 right next to me.

Carl
KM1H

----- Original Message ----- 
From: "Gary Schafer" <garyschafer at comcast.net>
To: "'Carl'" <km1h at jeremy.mv.com>; "'Joe Roth-WC4R'" <wc4r at live.com>; 
<boatanchors at mailman.qth.net>
Sent: Saturday, September 26, 2009 9:24 PM
Subject: RE: [Boatanchors] HQ-180 bandwidth

> It is doing exactly the same thing but with twice the bandwidth when you 
> use
> "both".
>
> 73
> Gary  K4FMX
>
>> -----Original Message-----
>> From: Carl [mailto:km1h at jeremy.mv.com]
>> Sent: Saturday, September 26, 2009 11:11 AM
>> To: Gary Schafer; 'Joe Roth-WC4R'; boatanchors at mailman.qth.net
>> Subject: Re: [Boatanchors] HQ-180 bandwidth
>>
>> That method also gives lots of adjacent channel bleed over as well as
>> rather
>> severe distortion on the ones Ive listened to.
>>
>> The USB or LSB method sounds mo betta.
>>
>> Carl
>> KM1H
>>
>>
>> ----- Original Message -----
>> From: "Gary Schafer" <garyschafer at comcast.net>
>> To: "'Carl'" <km1h at jeremy.mv.com>; "'Joe Roth-WC4R'" <wc4r at live.com>;
>> <boatanchors at mailman.qth.net>
>> Sent: Saturday, September 26, 2009 11:03 AM
>> Subject: RE: [Boatanchors] HQ-180 bandwidth
>>
>>
>> > Yes, 3 Kc of recovered audio if the carrier is centered in the band 
>> > pass
>> > with the selector switch in "both". But if you tune the carrier off to
>> one
>> > side so that you are only copying one side band then you have 6 Kc
>> > recovered
>> > audio bandwidth in the both position.
>> >
>> > If you are in USB or LSB position you can readily select upper or lower
>> > side
>> > band (with carrier centered as you suggested) by changing the switch
>> > position but you only have 3 Kc of recovered audio band width as the
>> > filter
>> > is only 3 Kc wide in these positions.
>> >
>> > 73
>> > Gary  K4FMX
>> >
>> >> -----Original Message-----
>> >> From: Carl [mailto:km1h at jeremy.mv.com]
>> >> Sent: Friday, September 25, 2009 9:08 PM
>> >> To: Gary Schafer; 'Joe Roth-WC4R'; boatanchors at mailman.qth.net
>> >> Subject: Re: [Boatanchors] HQ-180 bandwidth
>> >>
>> >> Now you have it right and we are back to Square One with that setup, 3
>> kc
>> >> of
>> >> audio recovery.
>> >>
>> >> Carl
>> >> KM1H
>> >>
>> >>
>> >> ----- Original Message -----
>> >> From: "Gary Schafer" <garyschafer at comcast.net>
>> >> To: "'Joe Roth-WC4R'" <wc4r at live.com>; <boatanchors at mailman.qth.net>
>> >> Sent: Friday, September 25, 2009 9:50 PM
>> >> Subject: Re: [Boatanchors] HQ-180 bandwidth
>> >>
>> >>
>> >> > Correction: placing the USB/LSB/both switch to both, doubles the
>> >> indicated
>> >> > bandwidth. 3 KC becomes 6 KC in both.
>> >> >
>> >> > 73
>> >> > Gary  K4FMX
>> >> >
>> >> >
>> >> >> -----Original Message-----
>> >> >> From: boatanchors-bounces at mailman.qth.net [mailto:boatanchors-
>> >> >> bounces at mailman.qth.net] On Behalf Of Gary Schafer
>> >> >> Sent: Friday, September 25, 2009 8:42 PM
>> >> >> To: 'Joe Roth-WC4R'; boatanchors at mailman.qth.net
>> >> >> Subject: Re: [Boatanchors] HQ-180 bandwidth
>> >> >>
>> >> >> When in the 3 kc bandwidth position it provides 3 kc if in SSB 
>> >> >> mode.
>> >> >> Switching to AM mode changes the bandwidth to 6 kc.
>> >> >> In other words the AM mode doubles the indicated bandwidth on the
>> >> switch.
>> >> >>
>> >> >> 73
>> >> >> Gary  K4FMX
>> >> >>
>> >> >> > -----Original Message-----
>> >> >> > From: boatanchors-bounces at mailman.qth.net [mailto:boatanchors-
>> >> >> > bounces at mailman.qth.net] On Behalf Of Joe Roth-WC4R
>> >> >> > Sent: Friday, September 25, 2009 8:13 AM
>> >> >> > To: boatanchors at mailman.qth.net
>> >> >> > Subject: [Boatanchors] HQ-180 bandwidth
>> >> >> >
>> >> >> > I have a Hammarlund HQ-180C, all stock. Is there a reasonable way
>> to
>> >> >> > change
>> >> >> > the 3 KC receive bandwidth to 5 or 6 KC? I don't want a butcher
>> job.
>> >> >> > Something clean & reversible.
>> >> >> > Joe, WC4R
>> >> >> >
>> >> >> > ______________________________________________________________
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